diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 71c5b04f0c..abbb090612 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -2844,13 +2844,13 @@ function human_time_diff( $from, $to = '' ) {
 		if ( $days <= 1 )
 			$days = 1;
 		$since = sprintf( _n( '%s day', '%s days', $days ), $days );
-	} elseif ( $diff < 30 * DAY_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
+	} elseif ( $diff < MONTH_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
 		$weeks = round( $diff / WEEK_IN_SECONDS );
 		if ( $weeks <= 1 )
 			$weeks = 1;
 		$since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
-	} elseif ( $diff < YEAR_IN_SECONDS && $diff >= 30 * DAY_IN_SECONDS ) {
-		$months = round( $diff / ( 30 * DAY_IN_SECONDS ) );
+	} elseif ( $diff < YEAR_IN_SECONDS && $diff >= MONTH_IN_SECONDS ) {
+		$months = round( $diff / MONTH_IN_SECONDS );
 		if ( $months <= 1 )
 			$months = 1;
 		$since = sprintf( _n( '%s month', '%s months', $months ), $months );