diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 86636785e..2802b87a4 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -16,7 +16,7 @@ function get_profile($field, $user = false) {
 }
 
 function mysql2date($dateformatstring, $mysqlstring, $use_b2configmonthsdays = 1) {
-	global $month, $weekday;
+	global $month, $weekday, $month_abbrev, $weekday_abbrev;
 	$m = $mysqlstring;
 	if (empty($m)) {
 		return false;
@@ -24,12 +24,15 @@ function mysql2date($dateformatstring, $mysqlstring, $use_b2configmonthsdays = 1
 	$i = mktime(substr($m,11,2),substr($m,14,2),substr($m,17,2),substr($m,5,2),substr($m,8,2),substr($m,0,4)); 
 	if (!empty($month) && !empty($weekday) && $use_b2configmonthsdays) {
 		$datemonth = $month[date('m', $i)];
+		$datemonth_abbrev = $month_abbrev[$datemonth];
 		$dateweekday = $weekday[date('w', $i)];
+		$dateweekday_abbrev = $weekday_abbrev[$dateweekday]; 		
 		$dateformatstring = ' '.$dateformatstring;
-		$dateformatstring = preg_replace("/([^\\\])D/", "\\1".backslashit(substr($dateweekday, 0, 3)), $dateformatstring);
+		$dateformatstring = preg_replace("/([^\\\])D/", "\\1".backslashit($dateweekday_abbrev), $dateformatstring);
 		$dateformatstring = preg_replace("/([^\\\])F/", "\\1".backslashit($datemonth), $dateformatstring);
 		$dateformatstring = preg_replace("/([^\\\])l/", "\\1".backslashit($dateweekday), $dateformatstring);
-		$dateformatstring = preg_replace("/([^\\\])M/", "\\1".backslashit(substr($datemonth, 0, 3)), $dateformatstring);
+		$dateformatstring = preg_replace("/([^\\\])M/", "\\1".backslashit($datemonth_abbrev), $dateformatstring);
+	
 		$dateformatstring = substr($dateformatstring, 1, strlen($dateformatstring)-1);
 	}
 	$j = @date($dateformatstring, $i);