diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
index 0f1f0f4e04..1056997831 100644
--- a/src/wp-admin/includes/ajax-actions.php
+++ b/src/wp-admin/includes/ajax-actions.php
@@ -1476,7 +1476,7 @@ function wp_ajax_add_meta() {
 			$post_data['post_status'] = 'draft';
 			$now                      = time();
 			/* translators: 1: Post creation date, 2: Post creation time */
-			$post_data['post_title'] = sprintf( __( 'Draft created on %1$s at %2$s' ), date( __( 'F j, Y' ), $now ), date( __( 'g:i a' ), $now ) );
+			$post_data['post_title'] = sprintf( __( 'Draft created on %1$s at %2$s' ), gmdate( __( 'F j, Y' ), $now ), gmdate( __( 'g:i a' ), $now ) );
 
 			$pid = edit_post( $post_data );
 			if ( $pid ) {
diff --git a/src/wp-admin/includes/class-ftp.php b/src/wp-admin/includes/class-ftp.php
index f1d40a4ffd..60fb2a19f6 100644
--- a/src/wp-admin/includes/class-ftp.php
+++ b/src/wp-admin/includes/class-ftp.php
@@ -207,7 +207,7 @@ class ftp_base {
 				$b['month'] = $lucifer[5];
 				$b['day'] = $lucifer[6];
 				if (preg_match("/([0-9]{2}):([0-9]{2})/",$lucifer[7],$l2)) {
-					$b['year'] = date("Y");
+					$b['year'] = gmdate("Y");
 					$b['hour'] = $l2[1];
 					$b['minute'] = $l2[2];
 				} else {
diff --git a/src/wp-admin/includes/class-wp-filesystem-direct.php b/src/wp-admin/includes/class-wp-filesystem-direct.php
index 41839097f0..9b1757cc65 100644
--- a/src/wp-admin/includes/class-wp-filesystem-direct.php
+++ b/src/wp-admin/includes/class-wp-filesystem-direct.php
@@ -598,8 +598,8 @@ class WP_Filesystem_Direct extends WP_Filesystem_Base {
 			$struc['group']       = $this->group( $path . '/' . $entry );
 			$struc['size']        = $this->size( $path . '/' . $entry );
 			$struc['lastmodunix'] = $this->mtime( $path . '/' . $entry );
-			$struc['lastmod']     = date( 'M j', $struc['lastmodunix'] );
-			$struc['time']        = date( 'h:i:s', $struc['lastmodunix'] );
+			$struc['lastmod']     = gmdate( 'M j', $struc['lastmodunix'] );
+			$struc['time']        = gmdate( 'h:i:s', $struc['lastmodunix'] );
 			$struc['type']        = $this->is_dir( $path . '/' . $entry ) ? 'd' : 'f';
 
 			if ( 'd' == $struc['type'] ) {
diff --git a/src/wp-admin/includes/class-wp-filesystem-ftpext.php b/src/wp-admin/includes/class-wp-filesystem-ftpext.php
index 1db0a57917..26d1454c9a 100644
--- a/src/wp-admin/includes/class-wp-filesystem-ftpext.php
+++ b/src/wp-admin/includes/class-wp-filesystem-ftpext.php
@@ -621,7 +621,7 @@ class WP_Filesystem_FTPext extends WP_Filesystem_Base {
 				$b['month'] = $lucifer[5];
 				$b['day']   = $lucifer[6];
 				if ( preg_match( '/([0-9]{2}):([0-9]{2})/', $lucifer[7], $l2 ) ) {
-					$b['year']   = date( 'Y' );
+					$b['year']   = gmdate( 'Y' );
 					$b['hour']   = $l2[1];
 					$b['minute'] = $l2[2];
 				} else {
diff --git a/src/wp-admin/includes/class-wp-filesystem-ssh2.php b/src/wp-admin/includes/class-wp-filesystem-ssh2.php
index b87a195724..47eb8e7ae9 100644
--- a/src/wp-admin/includes/class-wp-filesystem-ssh2.php
+++ b/src/wp-admin/includes/class-wp-filesystem-ssh2.php
@@ -744,8 +744,8 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 			$struc['group']       = $this->group( $path . '/' . $entry );
 			$struc['size']        = $this->size( $path . '/' . $entry );
 			$struc['lastmodunix'] = $this->mtime( $path . '/' . $entry );
-			$struc['lastmod']     = date( 'M j', $struc['lastmodunix'] );
-			$struc['time']        = date( 'h:i:s', $struc['lastmodunix'] );
+			$struc['lastmod']     = gmdate( 'M j', $struc['lastmodunix'] );
+			$struc['time']        = gmdate( 'h:i:s', $struc['lastmodunix'] );
 			$struc['type']        = $this->is_dir( $path . '/' . $entry ) ? 'd' : 'f';
 
 			if ( 'd' == $struc['type'] ) {
diff --git a/src/wp-admin/includes/dashboard.php b/src/wp-admin/includes/dashboard.php
index ad02909c74..9563fe37ab 100644
--- a/src/wp-admin/includes/dashboard.php
+++ b/src/wp-admin/includes/dashboard.php
@@ -863,11 +863,11 @@ function wp_dashboard_recent_posts( $args ) {
 			$posts->the_post();
 
 			$time = get_the_time( 'U' );
-			if ( date( 'Y-m-d', $time ) == $today ) {
+			if ( gmdate( 'Y-m-d', $time ) == $today ) {
 				$relative = __( 'Today' );
-			} elseif ( date( 'Y-m-d', $time ) == $tomorrow ) {
+			} elseif ( gmdate( 'Y-m-d', $time ) == $tomorrow ) {
 				$relative = __( 'Tomorrow' );
-			} elseif ( date( 'Y', $time ) !== $year ) {
+			} elseif ( gmdate( 'Y', $time ) !== $year ) {
 				/* translators: date and time format for recent posts on the dashboard, from a different calendar year, see https://secure.php.net/date */
 				$relative = date_i18n( __( 'M jS Y' ), $time );
 			} else {
diff --git a/src/wp-admin/includes/export.php b/src/wp-admin/includes/export.php
index 5600371455..bdf9fad69c 100644
--- a/src/wp-admin/includes/export.php
+++ b/src/wp-admin/includes/export.php
@@ -79,7 +79,7 @@ function export_wp( $args = array() ) {
 	if ( ! empty( $sitename ) ) {
 		$sitename .= '.';
 	}
-	$date        = date( 'Y-m-d' );
+	$date        = gmdate( 'Y-m-d' );
 	$wp_filename = $sitename . 'WordPress.' . $date . '.xml';
 	/**
 	 * Filters the export filename.
@@ -129,11 +129,11 @@ function export_wp( $args = array() ) {
 		}
 
 		if ( $args['start_date'] ) {
-			$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", date( 'Y-m-d', strtotime( $args['start_date'] ) ) );
+			$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", gmdate( 'Y-m-d', strtotime( $args['start_date'] ) ) );
 		}
 
 		if ( $args['end_date'] ) {
-			$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", date( 'Y-m-d', strtotime( '+1 month', strtotime( $args['end_date'] ) ) ) );
+			$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", gmdate( 'Y-m-d', strtotime( '+1 month', strtotime( $args['end_date'] ) ) ) );
 		}
 	}
 
@@ -458,7 +458,7 @@ function export_wp( $args = array() ) {
 	<title><?php bloginfo_rss( 'name' ); ?></title>
 	<link><?php bloginfo_rss( 'url' ); ?></link>
 	<description><?php bloginfo_rss( 'description' ); ?></description>
-	<pubDate><?php echo date( 'D, d M Y H:i:s +0000' ); ?></pubDate>
+	<pubDate><?php echo gmdate( 'D, d M Y H:i:s +0000' ); ?></pubDate>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
 	<wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version>
 	<wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url>
diff --git a/src/wp-admin/includes/post.php b/src/wp-admin/includes/post.php
index dc341bf9f3..8e31335944 100644
--- a/src/wp-admin/includes/post.php
+++ b/src/wp-admin/includes/post.php
@@ -170,10 +170,10 @@ function _wp_translate_postdata( $update = false, $post_data = null ) {
 		$hh                     = $post_data['hh'];
 		$mn                     = $post_data['mn'];
 		$ss                     = $post_data['ss'];
-		$aa                     = ( $aa <= 0 ) ? date( 'Y' ) : $aa;
-		$mm                     = ( $mm <= 0 ) ? date( 'n' ) : $mm;
+		$aa                     = ( $aa <= 0 ) ? gmdate( 'Y' ) : $aa;
+		$mm                     = ( $mm <= 0 ) ? gmdate( 'n' ) : $mm;
 		$jj                     = ( $jj > 31 ) ? 31 : $jj;
-		$jj                     = ( $jj <= 0 ) ? date( 'j' ) : $jj;
+		$jj                     = ( $jj <= 0 ) ? gmdate( 'j' ) : $jj;
 		$hh                     = ( $hh > 23 ) ? $hh - 24 : $hh;
 		$mn                     = ( $mn > 59 ) ? $mn - 60 : $mn;
 		$ss                     = ( $ss > 59 ) ? $ss - 60 : $ss;
diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index 4de9b109f4..38fdb9b25c 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -941,7 +941,7 @@ function upgrade_110() {
 
 	$time_difference = $all_options->time_difference;
 
-		$server_time = time() + date( 'Z' );
+		$server_time = time() + gmdate( 'Z' );
 	$weblogger_time  = $server_time + $time_difference * HOUR_IN_SECONDS;
 	$gmt_time        = time();
 
diff --git a/src/wp-admin/options-permalink.php b/src/wp-admin/options-permalink.php
index 8e064faebe..a7cb9c5d84 100644
--- a/src/wp-admin/options-permalink.php
+++ b/src/wp-admin/options-permalink.php
@@ -202,11 +202,11 @@ $structures = array(
 	</tr>
 	<tr>
 		<th scope="row"><label><input name="selection" type="radio" value="<?php echo esc_attr( $structures[1] ); ?>" <?php checked( $structures[1], $permalink_structure ); ?> /> <?php _e( 'Day and name' ); ?></label></th>
-		<td><code><?php echo get_option( 'home' ) . $blog_prefix . $prefix . '/' . date( 'Y' ) . '/' . date( 'm' ) . '/' . date( 'd' ) . '/' . _x( 'sample-post', 'sample permalink structure' ) . '/'; ?></code></td>
+		<td><code><?php echo get_option( 'home' ) . $blog_prefix . $prefix . '/' . gmdate( 'Y' ) . '/' . gmdate( 'm' ) . '/' . gmdate( 'd' ) . '/' . _x( 'sample-post', 'sample permalink structure' ) . '/'; ?></code></td>
 	</tr>
 	<tr>
 		<th scope="row"><label><input name="selection" type="radio" value="<?php echo esc_attr( $structures[2] ); ?>" <?php checked( $structures[2], $permalink_structure ); ?> /> <?php _e( 'Month and name' ); ?></label></th>
-		<td><code><?php echo get_option( 'home' ) . $blog_prefix . $prefix . '/' . date( 'Y' ) . '/' . date( 'm' ) . '/' . _x( 'sample-post', 'sample permalink structure' ) . '/'; ?></code></td>
+		<td><code><?php echo get_option( 'home' ) . $blog_prefix . $prefix . '/' . gmdate( 'Y' ) . '/' . gmdate( 'm' ) . '/' . _x( 'sample-post', 'sample permalink structure' ) . '/'; ?></code></td>
 	</tr>
 	<tr>
 		<th scope="row"><label><input name="selection" type="radio" value="<?php echo esc_attr( $structures[3] ); ?>" <?php checked( $structures[3], $permalink_structure ); ?> /> <?php _e( 'Numeric' ); ?></label></th>
diff --git a/src/wp-includes/IXR/class-IXR-date.php b/src/wp-includes/IXR/class-IXR-date.php
index 7304f603b5..fc80cda4a1 100644
--- a/src/wp-includes/IXR/class-IXR-date.php
+++ b/src/wp-includes/IXR/class-IXR-date.php
@@ -37,12 +37,12 @@ class IXR_Date {
 
     function parseTimestamp($timestamp)
     {
-        $this->year = date('Y', $timestamp);
-        $this->month = date('m', $timestamp);
-        $this->day = date('d', $timestamp);
-        $this->hour = date('H', $timestamp);
-        $this->minute = date('i', $timestamp);
-        $this->second = date('s', $timestamp);
+        $this->year = gmdate('Y', $timestamp);
+        $this->month = gmdate('m', $timestamp);
+        $this->day = gmdate('d', $timestamp);
+        $this->hour = gmdate('H', $timestamp);
+        $this->minute = gmdate('i', $timestamp);
+        $this->second = gmdate('s', $timestamp);
         $this->timezone = '';
     }
 
diff --git a/src/wp-includes/IXR/class-IXR-server.php b/src/wp-includes/IXR/class-IXR-server.php
index 095e44557b..9702ba28b7 100644
--- a/src/wp-includes/IXR/class-IXR-server.php
+++ b/src/wp-includes/IXR/class-IXR-server.php
@@ -151,7 +151,7 @@ EOD;
             header('Content-Type: text/xml; charset='.$charset);
         else
             header('Content-Type: text/xml');
-        header('Date: '.date('r'));
+        header('Date: '.gmdate('r'));
         echo $xml;
         exit;
     }
diff --git a/src/wp-includes/bookmark-template.php b/src/wp-includes/bookmark-template.php
index 78025b4550..85804125fb 100644
--- a/src/wp-includes/bookmark-template.php
+++ b/src/wp-includes/bookmark-template.php
@@ -87,7 +87,7 @@ function _walk_bookmarks( $bookmarks, $args = '' ) {
 				$title .= ' (';
 				$title .= sprintf(
 					__( 'Last updated: %s' ),
-					date(
+					gmdate(
 						get_option( 'links_updated_date_format' ),
 						$bookmark->link_updated_f + ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS )
 					)
diff --git a/src/wp-includes/class-wp.php b/src/wp-includes/class-wp.php
index b3bc907f9a..f939e33ac0 100644
--- a/src/wp-includes/class-wp.php
+++ b/src/wp-includes/class-wp.php
@@ -443,7 +443,7 @@ class WP {
 			}
 
 			if ( ! $wp_last_modified ) {
-				$wp_last_modified = date( 'D, d M Y H:i:s' );
+				$wp_last_modified = gmdate( 'D, d M Y H:i:s' );
 			}
 
 			$wp_last_modified .= ' GMT';
diff --git a/src/wp-includes/comment.php b/src/wp-includes/comment.php
index 5e89ef7695..6c2f332893 100644
--- a/src/wp-includes/comment.php
+++ b/src/wp-includes/comment.php
@@ -337,7 +337,7 @@ function get_lastcommentmodified( $timezone = 'server' ) {
 			$comment_modified_date = $wpdb->get_var( "SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" );
 			break;
 		case 'server':
-			$add_seconds_server = date( 'Z' );
+			$add_seconds_server = gmdate( 'Z' );
 
 			$comment_modified_date = $wpdb->get_var( $wpdb->prepare( "SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server ) );
 			break;
diff --git a/src/wp-includes/date.php b/src/wp-includes/date.php
index 8d82db784e..fa464c6dac 100644
--- a/src/wp-includes/date.php
+++ b/src/wp-includes/date.php
@@ -317,7 +317,7 @@ class WP_Date_Query {
 				$_year = $date_query['year'];
 			}
 
-			$max_days_of_year = date( 'z', mktime( 0, 0, 0, 12, 31, $_year ) ) + 1;
+			$max_days_of_year = gmdate( 'z', mktime( 0, 0, 0, 12, 31, $_year ) ) + 1;
 		} else {
 			// otherwise we use the max of 366 (leap-year)
 			$max_days_of_year = 366;
@@ -352,7 +352,7 @@ class WP_Date_Query {
 			 * If we have a specific year, use it to calculate number of weeks.
 			 * Note: the number of weeks in a year is the date in which Dec 28 appears.
 			 */
-			$week_count = date( 'W', mktime( 0, 0, 0, 12, 28, $_year ) );
+			$week_count = gmdate( 'W', mktime( 0, 0, 0, 12, 28, $_year ) );
 
 		} else {
 			// Otherwise set the week-count to a maximum of 53.
@@ -923,7 +923,7 @@ class WP_Date_Query {
 		}
 
 		if ( ! isset( $datetime['day'] ) ) {
-			$datetime['day'] = ( $default_to_max ) ? (int) date( 't', mktime( 0, 0, 0, $datetime['month'], 1, $datetime['year'] ) ) : 1;
+			$datetime['day'] = ( $default_to_max ) ? (int) gmdate( 't', mktime( 0, 0, 0, $datetime['month'], 1, $datetime['year'] ) ) : 1;
 		}
 
 		if ( ! isset( $datetime['hour'] ) ) {
diff --git a/src/wp-includes/deprecated.php b/src/wp-includes/deprecated.php
index d928a2891f..dc6134eea6 100644
--- a/src/wp-includes/deprecated.php
+++ b/src/wp-includes/deprecated.php
@@ -960,7 +960,7 @@ function get_links($category = -1, $before = '', $after = '<br />', $between = '
 
 		if ( $show_updated )
 			if (substr($row->link_updated_f, 0, 2) != '00')
-				$title .= ' ('.__('Last updated') . ' ' . date(get_option('links_updated_date_format'), $row->link_updated_f + (get_option('gmt_offset') * HOUR_IN_SECONDS)) . ')';
+				$title .= ' ('.__('Last updated') . ' ' . gmdate(get_option('links_updated_date_format'), $row->link_updated_f + (get_option('gmt_offset') * HOUR_IN_SECONDS)) . ')';
 
 		if ( '' != $title )
 			$title = ' title="' . $title . '"';
diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 3d51852798..bd879e4835 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -3432,13 +3432,13 @@ function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
 	if ( $tz ) {
 		$datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
 		if ( ! $datetime ) {
-			return date( $format, 0 );
+			return gmdate( $format, 0 );
 		}
 		$datetime->setTimezone( new DateTimeZone( $tz ) );
 		$string_localtime = $datetime->format( $format );
 	} else {
 		if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) ) {
-			return date( $format, 0 );
+			return gmdate( $format, 0 );
 		}
 		$string_time      = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
 		$string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index ce45499d0c..c9f817011a 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -41,7 +41,7 @@ function mysql2date( $format, $date, $translate = true ) {
 	if ( $translate ) {
 		return date_i18n( $format, $i );
 	} else {
-		return date( $format, $i );
+		return gmdate( $format, $i );
 	}
 }
 
@@ -111,12 +111,12 @@ function date_i18n( $dateformatstring, $timestamp_with_offset = false, $gmt = fa
 	$dateformatstring = preg_replace( '/(?<!\\\\)r/', DATE_RFC2822, $dateformatstring );
 
 	if ( ( ! empty( $wp_locale->month ) ) && ( ! empty( $wp_locale->weekday ) ) ) {
-		$datemonth            = $wp_locale->get_month( date( 'm', $i ) );
+		$datemonth            = $wp_locale->get_month( gmdate( 'm', $i ) );
 		$datemonth_abbrev     = $wp_locale->get_month_abbrev( $datemonth );
-		$dateweekday          = $wp_locale->get_weekday( date( 'w', $i ) );
+		$dateweekday          = $wp_locale->get_weekday( gmdate( 'w', $i ) );
 		$dateweekday_abbrev   = $wp_locale->get_weekday_abbrev( $dateweekday );
-		$datemeridiem         = $wp_locale->get_meridiem( date( 'a', $i ) );
-		$datemeridiem_capital = $wp_locale->get_meridiem( date( 'A', $i ) );
+		$datemeridiem         = $wp_locale->get_meridiem( gmdate( 'a', $i ) );
+		$datemeridiem_capital = $wp_locale->get_meridiem( gmdate( 'A', $i ) );
 		$dateformatstring     = ' ' . $dateformatstring;
 		$dateformatstring     = preg_replace( '/([^\\\])D/', "\\1" . backslashit( $dateweekday_abbrev ), $dateformatstring );
 		$dateformatstring     = preg_replace( '/([^\\\])F/', "\\1" . backslashit( $datemonth ), $dateformatstring );
@@ -177,7 +177,7 @@ function date_i18n( $dateformatstring, $timestamp_with_offset = false, $gmt = fa
 			}
 		}
 	}
-	$j = @date( $dateformatstring, $i );
+	$j = @gmdate( $dateformatstring, $i );
 
 	/**
 	 * Filters the date formatted based on the locale.
@@ -415,7 +415,7 @@ function get_weekstartend( $mysqlstring, $start_of_week = '' ) {
 	$day = mktime( 0, 0, 0, $md, $mm, $my );
 
 	// The day of the week from the timestamp.
-	$weekday = date( 'w', $day );
+	$weekday = gmdate( 'w', $day );
 
 	if ( ! is_numeric( $start_of_week ) ) {
 		$start_of_week = get_option( 'start_of_week' );
diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
index 633619cf4d..50323da6b9 100644
--- a/src/wp-includes/general-template.php
+++ b/src/wp-includes/general-template.php
@@ -2107,7 +2107,7 @@ function get_calendar( $initial = true, $echo = true ) {
 	}
 
 	$unixmonth = mktime( 0, 0, 0, $thismonth, 1, $thisyear );
-	$last_day  = date( 't', $unixmonth );
+	$last_day  = gmdate( 't', $unixmonth );
 
 	// Get the next and previous month and year with at least one post
 	$previous = $wpdb->get_row(
@@ -2133,7 +2133,7 @@ function get_calendar( $initial = true, $echo = true ) {
 	<caption>' . sprintf(
 		$calendar_caption,
 		$wp_locale->get_month( $thismonth ),
-		date( 'Y', $unixmonth )
+		gmdate( 'Y', $unixmonth )
 	) . '</caption>
 	<thead>
 	<tr>';
@@ -2199,13 +2199,13 @@ function get_calendar( $initial = true, $echo = true ) {
 	}
 
 	// See how much we should pad in the beginning
-	$pad = calendar_week_mod( date( 'w', $unixmonth ) - $week_begins );
+	$pad = calendar_week_mod( gmdate( 'w', $unixmonth ) - $week_begins );
 	if ( 0 != $pad ) {
 		$calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr( $pad ) . '" class="pad">&nbsp;</td>';
 	}
 
 	$newrow      = false;
-	$daysinmonth = (int) date( 't', $unixmonth );
+	$daysinmonth = (int) gmdate( 't', $unixmonth );
 
 	for ( $day = 1; $day <= $daysinmonth; ++$day ) {
 		if ( isset( $newrow ) && $newrow ) {
@@ -2223,7 +2223,7 @@ function get_calendar( $initial = true, $echo = true ) {
 
 		if ( in_array( $day, $daywithpost ) ) {
 			// any posts today?
-			$date_format = date( _x( 'F j, Y', 'daily archives date format' ), strtotime( "{$thisyear}-{$thismonth}-{$day}" ) );
+			$date_format = gmdate( _x( 'F j, Y', 'daily archives date format' ), strtotime( "{$thisyear}-{$thismonth}-{$day}" ) );
 			/* translators: Post calendar label. %s: Date */
 			$label            = sprintf( __( 'Posts published on %s' ), $date_format );
 			$calendar_output .= sprintf(
@@ -2237,12 +2237,12 @@ function get_calendar( $initial = true, $echo = true ) {
 		}
 		$calendar_output .= '</td>';
 
-		if ( 6 == calendar_week_mod( date( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) {
+		if ( 6 == calendar_week_mod( gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) {
 			$newrow = true;
 		}
 	}
 
-	$pad = 7 - calendar_week_mod( date( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins );
+	$pad = 7 - calendar_week_mod( gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins );
 	if ( $pad != 0 && $pad != 7 ) {
 		$calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr( $pad ) . '">&nbsp;</td>';
 	}
@@ -4452,7 +4452,7 @@ function get_the_generator( $type = '' ) {
 			$gen = '<!-- generator="WordPress/' . esc_attr( get_bloginfo( 'version' ) ) . '" -->';
 			break;
 		case 'export':
-			$gen = '<!-- generator="WordPress/' . esc_attr( get_bloginfo_rss( 'version' ) ) . '" created="' . date( 'Y-m-d H:i' ) . '" -->';
+			$gen = '<!-- generator="WordPress/' . esc_attr( get_bloginfo_rss( 'version' ) ) . '" created="' . gmdate( 'Y-m-d H:i' ) . '" -->';
 			break;
 	}
 
diff --git a/src/wp-includes/link-template.php b/src/wp-includes/link-template.php
index 3526239d3f..77b18c6fca 100644
--- a/src/wp-includes/link-template.php
+++ b/src/wp-includes/link-template.php
@@ -212,7 +212,7 @@ function get_permalink( $post = 0, $leavename = false ) {
 			$author     = $authordata->user_nicename;
 		}
 
-		$date           = explode( ' ', date( 'Y m d H i s', $unixtime ) );
+		$date           = explode( ' ', gmdate( 'Y m d H i s', $unixtime ) );
 		$rewritereplace =
 		array(
 			$date[0],
diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index 54e6c14f3b..5856af56ca 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -6031,8 +6031,8 @@ function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
  * @param WP_Post $post_before The Previous Post Object
  */
 function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
-	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
-	$new_date      = date( 'Y-m-d', strtotime( $post->post_date ) );
+	$previous_date = gmdate( 'Y-m-d', strtotime( $post_before->post_date ) );
+	$new_date      = gmdate( 'Y-m-d', strtotime( $post->post_date ) );
 	// Don't bother if it hasn't changed.
 	if ( $new_date == $previous_date ) {
 		return;
@@ -6286,7 +6286,7 @@ function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
 			$date = $wpdb->get_var( "SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );
 			break;
 		case 'server':
-			$add_seconds_server = date( 'Z' );
+			$add_seconds_server = gmdate( 'Z' );
 			$date               = $wpdb->get_var( "SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );
 			break;
 	}
diff --git a/src/wp-includes/rest-api.php b/src/wp-includes/rest-api.php
index 1c73b97824..adcca17d3b 100644
--- a/src/wp-includes/rest-api.php
+++ b/src/wp-includes/rest-api.php
@@ -924,10 +924,10 @@ function rest_get_date_with_gmt( $date, $is_utc = false ) {
 	// Timezone conversion needs to be handled differently between these two
 	// cases.
 	if ( ! $is_utc && ! $has_timezone ) {
-		$local = date( 'Y-m-d H:i:s', $date );
+		$local = gmdate( 'Y-m-d H:i:s', $date );
 		$utc   = get_gmt_from_date( $local );
 	} else {
-		$utc   = date( 'Y-m-d H:i:s', $date );
+		$utc   = gmdate( 'Y-m-d H:i:s', $date );
 		$local = get_date_from_gmt( $utc );
 	}
 
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index f24bc068c8..ee8af5b3ad 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1478,7 +1478,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			// based on the `post_modified` field with the site's timezone
 			// offset applied.
 			if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
-				$post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+				$post_modified_gmt = gmdate( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
 			} else {
 				$post_modified_gmt = $post->post_modified_gmt;
 			}
diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
index 8aab4ca5ad..19c3019881 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
@@ -925,7 +925,7 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 		}
 
 		if ( in_array( 'registered_date', $fields, true ) ) {
-			$data['registered_date'] = date( 'c', strtotime( $user->user_registered ) );
+			$data['registered_date'] = gmdate( 'c', strtotime( $user->user_registered ) );
 		}
 
 		if ( in_array( 'capabilities', $fields, true ) ) {
diff --git a/tests/phpunit/includes/testcase-rest-post-type-controller.php b/tests/phpunit/includes/testcase-rest-post-type-controller.php
index 832650855f..b25aed0fd2 100644
--- a/tests/phpunit/includes/testcase-rest-post-type-controller.php
+++ b/tests/phpunit/includes/testcase-rest-post-type-controller.php
@@ -10,7 +10,7 @@ abstract class WP_Test_REST_Post_Type_Controller_Testcase extends WP_Test_REST_C
 		$this->assertEquals( $post->post_name, $data['slug'] );
 		$this->assertEquals( get_permalink( $post->ID ), $data['link'] );
 		if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
-			$post_date_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_date ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+			$post_date_gmt = gmdate( 'Y-m-d H:i:s', strtotime( $post->post_date ) - ( get_option( 'gmt_offset' ) * 3600 ) );
 			$this->assertEquals( mysql_to_rfc3339( $post_date_gmt ), $data['date_gmt'] );
 		} else {
 			$this->assertEquals( mysql_to_rfc3339( $post->post_date_gmt ), $data['date_gmt'] );
@@ -18,7 +18,7 @@ abstract class WP_Test_REST_Post_Type_Controller_Testcase extends WP_Test_REST_C
 		$this->assertEquals( mysql_to_rfc3339( $post->post_date ), $data['date'] );
 
 		if ( '0000-00-00 00:00:00' === $post->post_modified_gmt ) {
-			$post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
+			$post_modified_gmt = gmdate( 'Y-m-d H:i:s', strtotime( $post->post_modified ) - ( get_option( 'gmt_offset' ) * 3600 ) );
 			$this->assertEquals( mysql_to_rfc3339( $post_modified_gmt ), $data['modified_gmt'] );
 		} else {
 			$this->assertEquals( mysql_to_rfc3339( $post->post_modified_gmt ), $data['modified_gmt'] );
diff --git a/tests/phpunit/tests/admin/includesCommunityEvents.php b/tests/phpunit/tests/admin/includesCommunityEvents.php
index 911d052f3c..995c5a1288 100644
--- a/tests/phpunit/tests/admin/includesCommunityEvents.php
+++ b/tests/phpunit/tests/admin/includesCommunityEvents.php
@@ -164,7 +164,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 
 		$this->assertNotWPError( $response );
 		$this->assertEqualSetsWithIndex( $this->get_user_location(), $response['location'] );
-		$this->assertEquals( date( 'l, M j, Y', strtotime( 'next Sunday 1pm' ) ), $response['events'][0]['formatted_date'] );
+		$this->assertEquals( gmdate( 'l, M j, Y', strtotime( 'next Sunday 1pm' ) ), $response['events'][0]['formatted_date'] );
 		$this->assertEquals( '1:00 pm', $response['events'][0]['formatted_time'] );
 
 		remove_filter( 'pre_http_request', array( $this, '_http_request_valid_response' ) );
@@ -185,7 +185,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 
 		$this->assertNotWPError( $cached_events );
 		$this->assertEqualSetsWithIndex( $this->get_user_location(), $cached_events['location'] );
-		$this->assertEquals( date( 'l, M j, Y', strtotime( 'next Sunday 1pm' ) ), $cached_events['events'][0]['formatted_date'] );
+		$this->assertEquals( gmdate( 'l, M j, Y', strtotime( 'next Sunday 1pm' ) ), $cached_events['events'][0]['formatted_date'] );
 		$this->assertEquals( '1:00 pm', $cached_events['events'][0]['formatted_time'] );
 
 		remove_filter( 'pre_http_request', array( $this, '_http_request_valid_response' ) );
@@ -211,7 +211,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Eastbay-WordPress-Meetup/events/236031233/',
 							'meetup'     => 'The East Bay WordPress Meetup Group',
 							'meetup_url' => 'https://www.meetup.com/Eastbay-WordPress-Meetup/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Sunday 1pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Sunday 1pm' ) ),
 							'location'   => array(
 								'location'  => 'Oakland, CA, USA',
 								'country'   => 'us',
@@ -225,7 +225,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/events/237706839/',
 							'meetup'     => 'WordPress Bay Area Foothills Group',
 							'meetup_url' => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Wednesday 1:30pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Wednesday 1:30pm' ) ),
 							'location'   => array(
 								'location'  => 'Milpitas, CA, USA',
 								'country'   => 'us',
@@ -239,7 +239,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://2017.kansascity.wordcamp.org',
 							'meetup'     => null,
 							'meetup_url' => null,
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Saturday' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Saturday' ) ),
 							'location'   => array(
 								'location'  => 'Kansas City, MO',
 								'country'   => 'US',
@@ -303,7 +303,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Eastbay-WordPress-Meetup/events/236031233/',
 							'meetup'     => 'The East Bay WordPress Meetup Group',
 							'meetup_url' => 'https://www.meetup.com/Eastbay-WordPress-Meetup/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Monday 1pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Monday 1pm' ) ),
 							'location'   => array(
 								'location'  => 'Oakland, CA, USA',
 								'country'   => 'us',
@@ -317,7 +317,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/events/237706839/',
 							'meetup'     => 'WordPress Bay Area Foothills Group',
 							'meetup_url' => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Tuesday 1:30pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Tuesday 1:30pm' ) ),
 							'location'   => array(
 								'location'  => 'Milpitas, CA, USA',
 								'country'   => 'us',
@@ -331,7 +331,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/sanjosewp/events/245419844/',
 							'meetup'     => 'The San Jose WordPress Meetup',
 							'meetup_url' => 'https://www.meetup.com/sanjosewp/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Wednesday 5:30pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Wednesday 5:30pm' ) ),
 							'location'   => array(
 								'location'  => 'Milpitas, CA, USA',
 								'country'   => 'us',
@@ -345,7 +345,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://2018.sandiego.wordcamp.org',
 							'meetup'     => null,
 							'meetup_url' => null,
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Thursday 9am' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Thursday 9am' ) ),
 							'location'   => array(
 								'location'  => 'San Diego, CA',
 								'country'   => 'US',
@@ -406,7 +406,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Eastbay-WordPress-Meetup/events/236031233/',
 							'meetup'     => 'The East Bay WordPress Meetup Group',
 							'meetup_url' => 'https://www.meetup.com/Eastbay-WordPress-Meetup/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( '2 days ago' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( '2 days ago' ) ),
 							'location'   => array(
 								'location'  => 'Oakland, CA, USA',
 								'country'   => 'us',
@@ -420,7 +420,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://2018.sandiego.wordcamp.org',
 							'meetup'     => null,
 							'meetup_url' => null,
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Tuesday 9am' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Tuesday 9am' ) ),
 							'location'   => array(
 								'location'  => 'San Diego, CA',
 								'country'   => 'US',
@@ -434,7 +434,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/events/237706839/',
 							'meetup'     => 'WordPress Bay Area Foothills Group',
 							'meetup_url' => 'https://www.meetup.com/Wordpress-Bay-Area-CA-Foothills/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Wednesday 1:30pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Wednesday 1:30pm' ) ),
 							'location'   => array(
 								'location'  => 'Milpitas, CA, USA',
 								'country'   => 'us',
@@ -448,7 +448,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://www.meetup.com/sanjosewp/events/245419844/',
 							'meetup'     => 'The San Jose WordPress Meetup',
 							'meetup_url' => 'https://www.meetup.com/sanjosewp/',
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Thursday 5:30pm' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Thursday 5:30pm' ) ),
 							'location'   => array(
 								'location'  => 'Milpitas, CA, USA',
 								'country'   => 'us',
@@ -462,7 +462,7 @@ class Test_WP_Community_Events extends WP_UnitTestCase {
 							'url'        => 'https://2018.la.wordcamp.org',
 							'meetup'     => null,
 							'meetup_url' => null,
-							'date'       => date( 'Y-m-d H:i:s', strtotime( 'next Friday 9am' ) ),
+							'date'       => gmdate( 'Y-m-d H:i:s', strtotime( 'next Friday 9am' ) ),
 							'location'   => array(
 								'location'  => 'Los Angeles, CA',
 								'country'   => 'US',
diff --git a/tests/phpunit/tests/admin/includesPost.php b/tests/phpunit/tests/admin/includesPost.php
index 5f5857629f..06c5ac467c 100644
--- a/tests/phpunit/tests/admin/includesPost.php
+++ b/tests/phpunit/tests/admin/includesPost.php
@@ -355,7 +355,7 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 		$permalink_structure = '%postname%';
 		$this->set_permalink_structure( "/$permalink_structure/" );
 
-		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + 100 );
 		$p           = self::factory()->post->create(
 			array(
 				'post_status' => 'future',
@@ -377,7 +377,7 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 	public function test_get_sample_permalink_html_should_use_default_permalink_for_view_post_link_when_pretty_permalinks_are_disabled() {
 		wp_set_current_user( self::$admin_id );
 
-		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + 100 );
 		$p           = self::factory()->post->create(
 			array(
 				'post_status' => 'future',
@@ -400,7 +400,7 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 
 		wp_set_current_user( self::$admin_id );
 
-		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + 100 );
 		$p           = self::factory()->post->create(
 			array(
 				'post_status' => 'future',
@@ -464,7 +464,7 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 		$this->assertContains( '>new_slug-صورة<', $found, $message );
 
 		// Scheduled posts should use published permalink
-		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + 100 );
 		$p           = self::factory()->post->create(
 			array(
 				'post_status' => 'future',
@@ -507,7 +507,7 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 
 		wp_set_current_user( self::$admin_id );
 
-		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + 100 );
 		$p           = self::factory()->post->create(
 			array(
 				'post_status' => 'pending',
diff --git a/tests/phpunit/tests/basic.php b/tests/phpunit/tests/basic.php
index e86a0aa71b..50dda1ec3f 100644
--- a/tests/phpunit/tests/basic.php
+++ b/tests/phpunit/tests/basic.php
@@ -13,7 +13,7 @@ class Tests_Basic extends WP_UnitTestCase {
 
 		$license = file_get_contents( ABSPATH . 'license.txt' );
 		preg_match( '#Copyright 2011-(\d+) by the contributors#', $license, $matches );
-		$this_year = date( 'Y' );
+		$this_year = gmdate( 'Y' );
 		$this->assertEquals( $this_year, trim( $matches[1] ), "license.txt's year needs to be updated to $this_year." );
 	}
 
diff --git a/tests/phpunit/tests/comment-submission.php b/tests/phpunit/tests/comment-submission.php
index 0760b44dc2..2ad7f49bf5 100644
--- a/tests/phpunit/tests/comment-submission.php
+++ b/tests/phpunit/tests/comment-submission.php
@@ -133,7 +133,7 @@ class Tests_Comment_Submission extends WP_UnitTestCase {
 
 		$post = self::factory()->post->create_and_get(
 			array(
-				'post_date' => date( 'Y-m-d H:i:s', strtotime( '+1 day' ) ),
+				'post_date' => gmdate( 'Y-m-d H:i:s', strtotime( '+1 day' ) ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/comment/commentsTemplate.php b/tests/phpunit/tests/comment/commentsTemplate.php
index b5cc7ef3e3..d5bf72d2f8 100644
--- a/tests/phpunit/tests/comment/commentsTemplate.php
+++ b/tests/phpunit/tests/comment/commentsTemplate.php
@@ -17,14 +17,14 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 
@@ -51,14 +51,14 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 
@@ -85,14 +85,14 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 
@@ -119,14 +119,14 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 
@@ -153,42 +153,42 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 		$comment_5 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 500 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 500 ),
 			)
 		);
 		$comment_6 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 600 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 600 ),
 			)
 		);
 
@@ -224,42 +224,42 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 		$comment_5 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 500 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 500 ),
 			)
 		);
 		$comment_6 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 600 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 600 ),
 			)
 		);
 
@@ -295,28 +295,28 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 
@@ -352,28 +352,28 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 
@@ -411,21 +411,21 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 
@@ -463,21 +463,21 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 
@@ -513,28 +513,28 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 
@@ -592,42 +592,42 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 		$comment_5 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 500 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 500 ),
 			)
 		);
 		$comment_6 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 600 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 600 ),
 			)
 		);
 
@@ -706,7 +706,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
 				'comment_approved' => '0',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
@@ -714,7 +714,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
 				'comment_approved' => '0',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
@@ -722,7 +722,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '3',
 				'comment_approved' => '0',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_4 = self::factory()->comment->create(
@@ -730,7 +730,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '4',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 
@@ -762,7 +762,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
 				'comment_approved' => '0',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
@@ -770,7 +770,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
 				'comment_approved' => '0',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
@@ -778,7 +778,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'      => $p,
 				'comment_content'      => '3',
 				'comment_approved'     => '0',
-				'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 				'comment_author_email' => $comment_author_email,
 			)
 		);
@@ -787,7 +787,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'      => $p,
 				'comment_content'      => '4',
 				'comment_approved'     => '0',
-				'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 				'comment_author_email' => $comment_author_email,
 			)
 		);
@@ -796,7 +796,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'      => $p,
 				'comment_content'      => '5',
 				'comment_approved'     => '0',
-				'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 				'comment_author_email' => $comment_author_email,
 			)
 		);
@@ -805,7 +805,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '6',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 
@@ -842,7 +842,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'      => $p,
 				'comment_content'      => '1',
 				'comment_approved'     => '0',
-				'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now ),
+				'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now ),
 				'comment_author_email' => 'foo@bar.mail',
 			)
 		);
@@ -878,7 +878,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
@@ -886,7 +886,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
@@ -895,7 +895,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_content'  => '3',
 				'comment_approved' => '1',
 				'comment_parent'   => $comment_1,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 
@@ -923,7 +923,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '1',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		$comment_2 = self::factory()->comment->create(
@@ -931,7 +931,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_post_ID'  => $p,
 				'comment_content'  => '2',
 				'comment_approved' => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		$comment_3 = self::factory()->comment->create(
@@ -940,7 +940,7 @@ class Tests_Comment_CommentsTemplate extends WP_UnitTestCase {
 				'comment_content'  => '3',
 				'comment_approved' => '1',
 				'comment_parent'   => $comment_1,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/comment/getCommentLink.php b/tests/phpunit/tests/comment/getCommentLink.php
index ca75da1532..03ccf923ab 100644
--- a/tests/phpunit/tests/comment/getCommentLink.php
+++ b/tests/phpunit/tests/comment/getCommentLink.php
@@ -15,42 +15,42 @@ class Tests_Comment_GetCommentLink extends WP_UnitTestCase {
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '1',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 100 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 100 ),
 			)
 		);
 		self::$comments[] = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '2',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 200 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 200 ),
 			)
 		);
 		self::$comments[] = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '3',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 300 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 300 ),
 			)
 		);
 		self::$comments[] = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 400 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 400 ),
 			)
 		);
 		self::$comments[] = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 500 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 500 ),
 			)
 		);
 		self::$comments[] = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$p,
 				'comment_content'  => '4',
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 600 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 600 ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/comment/getPageOfComment.php b/tests/phpunit/tests/comment/getPageOfComment.php
index 509ecffad6..e492e0e8d4 100644
--- a/tests/phpunit/tests/comment/getPageOfComment.php
+++ b/tests/phpunit/tests/comment/getPageOfComment.php
@@ -45,7 +45,7 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 				array(
 					'comment_post_ID'  => $p,
 					'comment_type'     => 'trackback',
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 				)
 			);
 			$now             -= 10 * $i;
@@ -57,7 +57,7 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 				array(
 					'comment_post_ID'  => $p,
 					'comment_type'     => 'pingback',
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 				)
 			);
 			$now            -= 10 * $i;
@@ -135,7 +135,7 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 				array(
 					'comment_post_ID'  => $p,
 					'comment_type'     => 'trackback',
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( 10 * $i ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( 10 * $i ) ),
 				)
 			);
 		}
@@ -226,20 +226,20 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
 				'comment_approved' => 0,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 
@@ -262,13 +262,13 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 			$comments_0[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $posts[0],
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
 				)
 			);
 			$comments_1[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $posts[1],
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
 				)
 			);
 		}
@@ -292,7 +292,7 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 			$parent                = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $post,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( $i * 60 ) ),
 				)
 			);
 			$comment_parents[ $i ] = $parent;
@@ -300,7 +300,7 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 			$child                  = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $post,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( $i * 59 ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( $i * 59 ) ),
 					'comment_parent'   => $parent,
 				)
 			);
@@ -336,19 +336,19 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 
@@ -369,25 +369,25 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 		$c4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 40 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 40 ),
 			)
 		);
 
@@ -409,25 +409,25 @@ class Tests_Comment_GetPageOfComment extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 		$c4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => $p,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 40 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 40 ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/comment/metaCache.php b/tests/phpunit/tests/comment/metaCache.php
index 834097a76c..a455654e11 100644
--- a/tests/phpunit/tests/comment/metaCache.php
+++ b/tests/phpunit/tests/comment/metaCache.php
@@ -142,7 +142,7 @@ class Tests_Comment_Meta_Cache extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $posts[0],
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( 60 * $i ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( 60 * $i ) ),
 				)
 			);
 		}
@@ -190,7 +190,7 @@ class Tests_Comment_Meta_Cache extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $posts[0],
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - ( 60 * $i ) ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - ( 60 * $i ) ),
 				)
 			);
 		}
diff --git a/tests/phpunit/tests/comment/query.php b/tests/phpunit/tests/comment/query.php
index 211415214b..9966f2d1bd 100644
--- a/tests/phpunit/tests/comment/query.php
+++ b/tests/phpunit/tests/comment/query.php
@@ -2949,25 +2949,25 @@ class Tests_Comment_Query extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 50 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 50 ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 40 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 40 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 		$c4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 
@@ -2995,25 +2995,25 @@ class Tests_Comment_Query extends WP_UnitTestCase {
 		$c1 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 50 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 50 ),
 			)
 		);
 		$c2 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 40 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 40 ),
 			)
 		);
 		$c3 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 30 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 30 ),
 			)
 		);
 		$c4 = self::factory()->comment->create(
 			array(
 				'comment_post_ID'  => self::$post_id,
-				'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - 20 ),
+				'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - 20 ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/comment/wpAllowComment.php b/tests/phpunit/tests/comment/wpAllowComment.php
index 6d3e3ef6d8..a1404b624c 100644
--- a/tests/phpunit/tests/comment/wpAllowComment.php
+++ b/tests/phpunit/tests/comment/wpAllowComment.php
@@ -42,7 +42,7 @@ class Tests_Comment_WpAllowComment extends WP_UnitTestCase {
 			'comment_content'      => 'Yes, we can!',
 			'comment_author_IP'    => '192.168.0.1',
 			'comment_parent'       => 0,
-			'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now ),
+			'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now ),
 			'comment_agent'        => 'Bobbot/2.1',
 			'comment_type'         => '',
 		);
@@ -65,7 +65,7 @@ class Tests_Comment_WpAllowComment extends WP_UnitTestCase {
 			'comment_content'      => 'Yes, we can!',
 			'comment_author_IP'    => '192.168.0.1',
 			'comment_parent'       => 0,
-			'comment_date_gmt'     => date( 'Y-m-d H:i:s', $now ),
+			'comment_date_gmt'     => gmdate( 'Y-m-d H:i:s', $now ),
 			'comment_agent'        => 'Bobbot/2.1',
 			'comment_type'         => '',
 		);
diff --git a/tests/phpunit/tests/comment/wpListComments.php b/tests/phpunit/tests/comment/wpListComments.php
index da330c7924..9fb94467d0 100644
--- a/tests/phpunit/tests/comment/wpListComments.php
+++ b/tests/phpunit/tests/comment/wpListComments.php
@@ -16,7 +16,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 				)
 			);
@@ -54,7 +54,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 				)
 			);
@@ -92,7 +92,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 				)
 			);
@@ -138,7 +138,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 				)
 			);
@@ -178,7 +178,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 				)
 			);
@@ -223,7 +223,7 @@ class Tests_Comment_WpListComments extends WP_UnitTestCase {
 			$comments[] = self::factory()->comment->create(
 				array(
 					'comment_post_ID'  => $p,
-					'comment_date_gmt' => date( 'Y-m-d H:i:s', $now - $i ),
+					'comment_date_gmt' => gmdate( 'Y-m-d H:i:s', $now - $i ),
 					'comment_author'   => 'Commenter ' . $i,
 					'user_id'          => $u,
 				)
diff --git a/tests/phpunit/tests/date/dateI18n.php b/tests/phpunit/tests/date/dateI18n.php
index 408a4ce447..3305856913 100644
--- a/tests/phpunit/tests/date/dateI18n.php
+++ b/tests/phpunit/tests/date/dateI18n.php
@@ -6,7 +6,7 @@
  */
 class Tests_Date_I18n extends WP_UnitTestCase {
 	public function test_should_format_date() {
-		$this->assertEquals( strtotime( date( 'Y-m-d H:i:s' ) ), strtotime( date_i18n( 'Y-m-d H:i:s' ) ), 'The dates should be equal', 2 );
+		$this->assertEquals( strtotime( gmdate( 'Y-m-d H:i:s' ) ), strtotime( date_i18n( 'Y-m-d H:i:s' ) ), 'The dates should be equal', 2 );
 	}
 
 	public function test_should_use_custom_timestamp() {
@@ -14,7 +14,7 @@ class Tests_Date_I18n extends WP_UnitTestCase {
 	}
 
 	public function test_date_should_be_in_gmt() {
-		$this->assertEquals( strtotime( date( DATE_RFC3339 ) ), strtotime( date_i18n( DATE_RFC3339, false, true ) ), 'The dates should be equal', 2 );
+		$this->assertEquals( strtotime( gmdate( DATE_RFC3339 ) ), strtotime( date_i18n( DATE_RFC3339, false, true ) ), 'The dates should be equal', 2 );
 	}
 
 	public function test_custom_timestamp_ignores_gmt_setting() {
@@ -24,13 +24,13 @@ class Tests_Date_I18n extends WP_UnitTestCase {
 	public function test_custom_timezone_setting() {
 		update_option( 'timezone_string', 'America/Regina' );
 
-		$this->assertEquals( strtotime( date( 'Y-m-d H:i:s', time() + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) ), strtotime( date_i18n( 'Y-m-d H:i:s' ) ), 'The dates should be equal', 2 );
+		$this->assertEquals( strtotime( gmdate( 'Y-m-d H:i:s', time() + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ) ), strtotime( date_i18n( 'Y-m-d H:i:s' ) ), 'The dates should be equal', 2 );
 	}
 
 	public function test_date_should_be_in_gmt_with_custom_timezone_setting() {
 		update_option( 'timezone_string', 'America/Regina' );
 
-		$this->assertEquals( strtotime( date( DATE_RFC3339 ) ), strtotime( date_i18n( DATE_RFC3339, false, true ) ), 'The dates should be equal', 2 );
+		$this->assertEquals( strtotime( gmdate( DATE_RFC3339 ) ), strtotime( date_i18n( DATE_RFC3339, false, true ) ), 'The dates should be equal', 2 );
 	}
 
 	public function test_date_should_be_in_gmt_with_custom_timezone_setting_and_timestamp() {
diff --git a/tests/phpunit/tests/functions/getArchives.php b/tests/phpunit/tests/functions/getArchives.php
index bd7b617250..f3cc4536df 100644
--- a/tests/phpunit/tests/functions/getArchives.php
+++ b/tests/phpunit/tests/functions/getArchives.php
@@ -15,8 +15,8 @@ class Tests_Get_Archives extends WP_UnitTestCase {
 	function setUp() {
 		parent::setUp();
 
-		$this->month_url = get_month_link( date( 'Y' ), date( 'm' ) );
-		$this->year_url  = get_year_link( date( 'Y' ) );
+		$this->month_url = get_month_link( gmdate( 'Y' ), gmdate( 'm' ) );
+		$this->year_url  = get_year_link( gmdate( 'Y' ) );
 	}
 
 	public static function wpSetUpBeforeClass( $factory ) {
@@ -30,12 +30,12 @@ class Tests_Get_Archives extends WP_UnitTestCase {
 	}
 
 	function test_wp_get_archives_default() {
-		$expected['default'] = "<li><a href='" . $this->month_url . "'>" . date( 'F Y' ) . '</a></li>';
+		$expected['default'] = "<li><a href='" . $this->month_url . "'>" . gmdate( 'F Y' ) . '</a></li>';
 		$this->assertEquals( $expected['default'], trim( wp_get_archives( array( 'echo' => false ) ) ) );
 	}
 
 	function test_wp_get_archives_type() {
-		$expected['type'] = "<li><a href='" . $this->year_url . "'>" . date( 'Y' ) . '</a></li>';
+		$expected['type'] = "<li><a href='" . $this->year_url . "'>" . gmdate( 'Y' ) . '</a></li>';
 		$this->assertEquals(
 			$expected['type'],
 			trim(
@@ -86,7 +86,7 @@ EOF;
 	}
 
 	function test_wp_get_archives_format() {
-		$expected['format'] = "<option value='" . $this->month_url . "'> " . date( 'F Y' ) . ' </option>';
+		$expected['format'] = "<option value='" . $this->month_url . "'> " . gmdate( 'F Y' ) . ' </option>';
 		$this->assertEquals(
 			$expected['format'],
 			trim(
@@ -101,7 +101,7 @@ EOF;
 	}
 
 	function test_wp_get_archives_before_and_after() {
-		$expected['before_and_after'] = "<div><a href='" . $this->month_url . "'>" . date( 'F Y' ) . '</a></div>';
+		$expected['before_and_after'] = "<div><a href='" . $this->month_url . "'>" . gmdate( 'F Y' ) . '</a></div>';
 		$this->assertEquals(
 			$expected['before_and_after'],
 			trim(
@@ -118,7 +118,7 @@ EOF;
 	}
 
 	function test_wp_get_archives_show_post_count() {
-		$expected['show_post_count'] = "<li><a href='" . $this->month_url . "'>" . date( 'F Y' ) . '</a>&nbsp;(8)</li>';
+		$expected['show_post_count'] = "<li><a href='" . $this->month_url . "'>" . gmdate( 'F Y' ) . '</a>&nbsp;(8)</li>';
 		$this->assertEquals(
 			$expected['show_post_count'],
 			trim(
@@ -133,7 +133,7 @@ EOF;
 	}
 
 	function test_wp_get_archives_echo() {
-		$expected['echo'] = "\t<li><a href='" . $this->month_url . "'>" . date( 'F Y' ) . '</a></li>' . "\n";
+		$expected['echo'] = "\t<li><a href='" . $this->month_url . "'>" . gmdate( 'F Y' ) . '</a></li>' . "\n";
 		$this->expectOutputString( $expected['echo'] );
 		wp_get_archives( array( 'echo' => true ) );
 	}
@@ -147,7 +147,7 @@ EOF;
 			)
 		);
 
-		$date_full             = date( 'F Y' );
+		$date_full             = gmdate( 'F Y' );
 		$oct_url               = get_month_link( 2012, 10 );
 		$expected['order_asc'] = <<<EOF
 <li><a href='{$oct_url}'>October 2012</a></li>
diff --git a/tests/phpunit/tests/media.php b/tests/phpunit/tests/media.php
index 857de42386..112382462a 100644
--- a/tests/phpunit/tests/media.php
+++ b/tests/phpunit/tests/media.php
@@ -1428,7 +1428,7 @@ EOF;
 	function test_wp_calculate_image_srcset() {
 		$_wp_additional_image_sizes = wp_get_additional_image_sizes();
 
-		$year_month      = date( 'Y/m' );
+		$year_month      = gmdate( 'Y/m' );
 		$image_meta      = wp_get_attachment_metadata( self::$large_id );
 		$uploads_dir_url = 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/';
 
@@ -1550,7 +1550,7 @@ EOF;
 	function test_wp_calculate_image_srcset_with_absolute_path_in_meta() {
 		$_wp_additional_image_sizes = wp_get_additional_image_sizes();
 
-		$year_month      = date( 'Y/m' );
+		$year_month      = gmdate( 'Y/m' );
 		$image_meta      = wp_get_attachment_metadata( self::$large_id );
 		$uploads_dir_url = 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/';
 
@@ -1831,7 +1831,7 @@ EOF;
 
 		$srcset = wp_get_attachment_image_srcset( self::$large_id, $size_array, $image_meta );
 
-		$year_month  = date( 'Y/m' );
+		$year_month  = gmdate( 'Y/m' );
 		$uploads_dir = 'http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/';
 
 		// Set up test cases for all expected size names.
@@ -2228,8 +2228,8 @@ EOF;
 		remove_all_filters( 'wp_calculate_image_sizes' );
 
 		$actual = wp_get_attachment_image( self::$large_id, 'testsize' );
-		$year   = date( 'Y' );
-		$month  = date( 'm' );
+		$year   = gmdate( 'Y' );
+		$month  = gmdate( 'm' );
 
 		$expected = '<img width="999" height="999" src="http://' . WP_TESTS_DOMAIN . '/wp-content/uploads/' . $year . '/' . $month . '/test-image-testsize-999x999.png"' .
 			' class="attachment-testsize size-testsize" alt=""' .
diff --git a/tests/phpunit/tests/multisite/wpmuValidateUserSignup.php b/tests/phpunit/tests/multisite/wpmuValidateUserSignup.php
index 15ab87a0ec..02fee8ae5f 100644
--- a/tests/phpunit/tests/multisite/wpmuValidateUserSignup.php
+++ b/tests/phpunit/tests/multisite/wpmuValidateUserSignup.php
@@ -99,7 +99,7 @@ if ( is_multisite() ) :
 			remove_filter( 'wpmu_signup_user_notification', '__return_true' );
 
 			global $wpdb;
-			$date = date( 'Y-m-d H:i:s', time() - ( 2 * DAY_IN_SECONDS ) - 60 );
+			$date = gmdate( 'Y-m-d H:i:s', time() - ( 2 * DAY_IN_SECONDS ) - 60 );
 			$wpdb->update( $wpdb->signups, array( 'registered' => $date ), array( 'user_login' => 'foo123' ) );
 
 			$v = wpmu_validate_user_signup( 'foo123', 'foo2@example.com' );
@@ -123,7 +123,7 @@ if ( is_multisite() ) :
 			remove_filter( 'wpmu_signup_user_notification', '__return_true' );
 
 			global $wpdb;
-			$date = date( 'Y-m-d H:i:s', time() - ( 2 * DAY_IN_SECONDS ) - 60 );
+			$date = gmdate( 'Y-m-d H:i:s', time() - ( 2 * DAY_IN_SECONDS ) - 60 );
 			$wpdb->update( $wpdb->signups, array( 'registered' => $date ), array( 'user_login' => 'foo123' ) );
 
 			$v = wpmu_validate_user_signup( 'foo2', 'foo2@example.com' );
diff --git a/tests/phpunit/tests/post/listPages.php b/tests/phpunit/tests/post/listPages.php
index 2c5a9a26c2..8d8b85bd52 100644
--- a/tests/phpunit/tests/post/listPages.php
+++ b/tests/phpunit/tests/post/listPages.php
@@ -49,7 +49,7 @@ class Tests_List_Pages extends WP_UnitTestCase {
 	public static function wpSetupBeforeClass() {
 		self::$time = time();
 
-		$post_date = date( 'Y-m-d H:i:s', self::$time );
+		$post_date = gmdate( 'Y-m-d H:i:s', self::$time );
 
 		self::$parent_1 = self::factory()->post->create(
 			array(
@@ -157,7 +157,7 @@ class Tests_List_Pages extends WP_UnitTestCase {
 			'depth'     => 1,
 			'show_date' => true,
 		);
-		$date = date( get_option( 'date_format' ), self::$time );
+		$date = gmdate( get_option( 'date_format' ), self::$time );
 
 		$expected = '<li class="pagenav">Pages<ul><li class="page_item page-item-' . self::$parent_1 . ' page_item_has_children"><a href="' . get_permalink( self::$parent_1 ) . '">Parent 1</a> ' . $date . '</li>
 <li class="page_item page-item-' . self::$parent_2 . ' page_item_has_children"><a href="' . get_permalink( self::$parent_2 ) . '">Parent 2</a> ' . $date . '</li>
@@ -173,7 +173,7 @@ class Tests_List_Pages extends WP_UnitTestCase {
 			'show_date'   => true,
 			'date_format' => 'l, F j, Y',
 		);
-		$date = date( $args['date_format'], self::$time );
+		$date = gmdate( $args['date_format'], self::$time );
 
 		$expected = '<li class="pagenav">Pages<ul><li class="page_item page-item-' . self::$parent_1 . ' page_item_has_children"><a href="' . get_permalink( self::$parent_1 ) . '">Parent 1</a> ' . $date . '
 <ul class=\'children\'>
diff --git a/tests/phpunit/tests/post/revisions.php b/tests/phpunit/tests/post/revisions.php
index bbb25a8ad6..b3927a537e 100644
--- a/tests/phpunit/tests/post/revisions.php
+++ b/tests/phpunit/tests/post/revisions.php
@@ -532,7 +532,7 @@ class Tests_Post_Revisions extends WP_UnitTestCase {
 		$now          = time();
 		for ( $j = 1; $j < 3; $j++ ) {
 			// Manually modify dates to ensure they're different.
-			$date                                  = date( 'Y-m-d H:i:s', $now - ( $j * 10 ) );
+			$date                                  = gmdate( 'Y-m-d H:i:s', $now - ( $j * 10 ) );
 			$post_revision_fields['post_date']     = $date;
 			$post_revision_fields['post_date_gmt'] = $date;
 
@@ -563,7 +563,7 @@ class Tests_Post_Revisions extends WP_UnitTestCase {
 		$post_revision_fields = wp_slash( $post_revision_fields );
 
 		$revision_ids = array();
-		$date         = date( 'Y-m-d H:i:s', time() - 10 );
+		$date         = gmdate( 'Y-m-d H:i:s', time() - 10 );
 		for ( $j = 1; $j < 3; $j++ ) {
 			// Manually modify dates to ensure they're the same.
 			$post_revision_fields['post_date']     = $date;
diff --git a/tests/phpunit/tests/query/stickies.php b/tests/phpunit/tests/query/stickies.php
index 61bf15aa19..01e7405e6a 100644
--- a/tests/phpunit/tests/query/stickies.php
+++ b/tests/phpunit/tests/query/stickies.php
@@ -12,7 +12,7 @@ class Tests_Query_Stickies extends WP_UnitTestCase {
 		// Set post times to get a reliable order.
 		$now = time();
 		for ( $i = 0; $i <= 22; $i++ ) {
-			$post_date         = date( 'Y-m-d H:i:s', $now - ( 10 * $i ) );
+			$post_date         = gmdate( 'Y-m-d H:i:s', $now - ( 10 * $i ) );
 			self::$posts[ $i ] = $factory->post->create(
 				array(
 					'post_date' => $post_date,
@@ -28,7 +28,7 @@ class Tests_Query_Stickies extends WP_UnitTestCase {
 	public function test_stickies_should_be_ignored_when_is_home_is_false() {
 		$q = new WP_Query(
 			array(
-				'year'           => date( 'Y' ),
+				'year'           => gmdate( 'Y' ),
 				'fields'         => 'ids',
 				'posts_per_page' => 3,
 			)
diff --git a/tests/phpunit/tests/rest-api/rest-posts-controller.php b/tests/phpunit/tests/rest-api/rest-posts-controller.php
index 40d609c75d..dea31fd677 100644
--- a/tests/phpunit/tests/rest-api/rest-posts-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-posts-controller.php
@@ -2010,8 +2010,8 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertEquals( 'draft', $data['status'] );
 		$this->assertEquals( 'draft', $new_post->post_status );
 		// Confirm dates are shimmed for gmt_offset
-		$post_modified_gmt = date( 'Y-m-d H:i:s', strtotime( $new_post->post_modified ) + ( get_option( 'gmt_offset' ) * 3600 ) );
-		$post_date_gmt     = date( 'Y-m-d H:i:s', strtotime( $new_post->post_date ) + ( get_option( 'gmt_offset' ) * 3600 ) );
+		$post_modified_gmt = gmdate( 'Y-m-d H:i:s', strtotime( $new_post->post_modified ) + ( get_option( 'gmt_offset' ) * 3600 ) );
+		$post_date_gmt     = gmdate( 'Y-m-d H:i:s', strtotime( $new_post->post_date ) + ( get_option( 'gmt_offset' ) * 3600 ) );
 
 		$this->assertEquals( mysql_to_rfc3339( $post_modified_gmt ), $data['modified_gmt'] );
 		$this->assertEquals( mysql_to_rfc3339( $post_date_gmt ), $data['date_gmt'] );
@@ -2736,8 +2736,8 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertEquals( $new_content, $new_post->post_content );
 
 		// The modified date should equal the current time.
-		$this->assertEquals( date( 'Y-m-d', strtotime( mysql_to_rfc3339( $expected_modified ) ) ), date( 'Y-m-d', strtotime( $data['modified'] ) ) );
-		$this->assertEquals( date( 'Y-m-d', strtotime( $expected_modified ) ), date( 'Y-m-d', strtotime( $new_post->post_modified ) ) );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( mysql_to_rfc3339( $expected_modified ) ) ), gmdate( 'Y-m-d', strtotime( $data['modified'] ) ) );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( $expected_modified ) ), gmdate( 'Y-m-d', strtotime( $new_post->post_modified ) ) );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/rest-api/rest-users-controller.php b/tests/phpunit/tests/rest-api/rest-users-controller.php
index 5addd6b6f4..02ef87c04b 100644
--- a/tests/phpunit/tests/rest-api/rest-users-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-users-controller.php
@@ -2791,7 +2791,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			$this->assertEquals( $user->user_email, $data['email'] );
 			$this->assertEquals( (object) $user->allcaps, $data['capabilities'] );
 			$this->assertEquals( (object) $user->caps, $data['extra_capabilities'] );
-			$this->assertEquals( date( 'c', strtotime( $user->user_registered ) ), $data['registered_date'] );
+			$this->assertEquals( gmdate( 'c', strtotime( $user->user_registered ) ), $data['registered_date'] );
 			$this->assertEquals( $user->user_login, $data['username'] );
 			$this->assertEquals( $user->roles, $data['roles'] );
 			$this->assertEquals( get_user_locale( $user ), $data['locale'] );
diff --git a/tests/phpunit/tests/url.php b/tests/phpunit/tests/url.php
index 4d59c67bed..66f4b77eb6 100644
--- a/tests/phpunit/tests/url.php
+++ b/tests/phpunit/tests/url.php
@@ -336,8 +336,8 @@ class Tests_URL extends WP_UnitTestCase {
 
 	public function test_get_adjacent_post() {
 		$now      = time();
-		$post_id  = self::factory()->post->create( array( 'post_date' => date( 'Y-m-d H:i:s', $now - 1 ) ) );
-		$post_id2 = self::factory()->post->create( array( 'post_date' => date( 'Y-m-d H:i:s', $now ) ) );
+		$post_id  = self::factory()->post->create( array( 'post_date' => gmdate( 'Y-m-d H:i:s', $now - 1 ) ) );
+		$post_id2 = self::factory()->post->create( array( 'post_date' => gmdate( 'Y-m-d H:i:s', $now ) ) );
 
 		if ( ! isset( $GLOBALS['post'] ) ) {
 			$GLOBALS['post'] = null;
@@ -379,13 +379,13 @@ class Tests_URL extends WP_UnitTestCase {
 			array(
 				'post_author' => $u,
 				'post_status' => 'private',
-				'post_date'   => date( 'Y-m-d H:i:s', $now - 1 ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now - 1 ),
 			)
 		);
 		$p2  = self::factory()->post->create(
 			array(
 				'post_author' => $u,
-				'post_date'   => date( 'Y-m-d H:i:s', $now ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 
@@ -417,13 +417,13 @@ class Tests_URL extends WP_UnitTestCase {
 			array(
 				'post_author' => $u1,
 				'post_status' => 'private',
-				'post_date'   => date( 'Y-m-d H:i:s', $now - 1 ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now - 1 ),
 			)
 		);
 		$p2  = self::factory()->post->create(
 			array(
 				'post_author' => $u1,
-				'post_date'   => date( 'Y-m-d H:i:s', $now ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 
@@ -454,20 +454,20 @@ class Tests_URL extends WP_UnitTestCase {
 		$p1  = self::factory()->post->create(
 			array(
 				'post_author' => $u1,
-				'post_date'   => date( 'Y-m-d H:i:s', $now - 2 ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now - 2 ),
 			)
 		);
 		$p2  = self::factory()->post->create(
 			array(
 				'post_author' => $u1,
 				'post_status' => 'private',
-				'post_date'   => date( 'Y-m-d H:i:s', $now - 1 ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now - 1 ),
 			)
 		);
 		$p3  = self::factory()->post->create(
 			array(
 				'post_author' => $u1,
-				'post_date'   => date( 'Y-m-d H:i:s', $now ),
+				'post_date'   => gmdate( 'Y-m-d H:i:s', $now ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/xmlrpc/wp/editPost.php b/tests/phpunit/tests/xmlrpc/wp/editPost.php
index 90399b092c..7e69bf77c2 100644
--- a/tests/phpunit/tests/xmlrpc/wp/editPost.php
+++ b/tests/phpunit/tests/xmlrpc/wp/editPost.php
@@ -274,7 +274,7 @@ class Tests_XMLRPC_wp_editPost extends WP_XMLRPC_UnitTestCase {
 				'post_content' => 'Not edited',
 				'post_author'  => $editor_id,
 				'post_status'  => 'publish',
-				'post_date'    => date( 'Y-m-d H:i:s', $yesterday ),
+				'post_date'    => gmdate( 'Y-m-d H:i:s', $yesterday ),
 			)
 		);
 
diff --git a/tests/phpunit/tests/xmlrpc/wp/getPosts.php b/tests/phpunit/tests/xmlrpc/wp/getPosts.php
index cce9e5b0df..c9a1b4cce1 100644
--- a/tests/phpunit/tests/xmlrpc/wp/getPosts.php
+++ b/tests/phpunit/tests/xmlrpc/wp/getPosts.php
@@ -60,7 +60,7 @@ class Tests_XMLRPC_wp_getPosts extends WP_XMLRPC_UnitTestCase {
 			$post_ids[] = self::factory()->post->create(
 				array(
 					'post_type' => $cpt_name,
-					'post_date' => date( 'Y-m-d H:i:s', time() + $i ),
+					'post_date' => gmdate( 'Y-m-d H:i:s', time() + $i ),
 				)
 			);
 		}