diff --git a/src/wp-admin/includes/plugin-install.php b/src/wp-admin/includes/plugin-install.php
index 327c1387af..d7a1a48fe9 100644
--- a/src/wp-admin/includes/plugin-install.php
+++ b/src/wp-admin/includes/plugin-install.php
@@ -439,6 +439,8 @@ function install_plugin_information() {
 
 	echo "</div>\n";
 
+	$date_format = __( 'M j, Y @ G:i' );
+	$last_updated_timestamp = strtotime( $api->last_updated );
 	?>
 	<div id="<?php echo $_tab; ?>-content" class='<?php echo $_with_banner; ?>'>
 	<div class="fyi">
@@ -448,8 +450,8 @@ function install_plugin_information() {
 		<?php } if ( ! empty( $api->author ) ) { ?>
 			<li><strong><?php _e( 'Author:' ); ?></strong> <?php echo links_add_target( $api->author, '_blank' ); ?></li>
 		<?php } if ( ! empty( $api->last_updated ) ) { ?>
-			<li><strong><?php _e( 'Last Updated:' ); ?></strong> <span title="<?php echo $api->last_updated; ?>">
-				<?php printf( __( '%s ago' ), human_time_diff( strtotime( $api->last_updated ) ) ); ?>
+			<li><strong><?php _e( 'Last Updated:' ); ?></strong> <span title="<?php echo esc_attr( date_i18n( $date_format, $last_updated_timestamp ) ); ?>">
+				<?php printf( __( '%s ago' ), human_time_diff( $last_updated_timestamp ) ); ?>
 			</span></li>
 		<?php } if ( ! empty( $api->requires ) ) { ?>
 			<li><strong><?php _e( 'Requires WordPress Version:' ); ?></strong> <?php printf( __( '%s or higher' ), $api->requires ); ?></li>