Ticket #54186: 54186.patch

post.php

@@ -4715 +4715 @@
         }
 
         // Validate the date.
-        $month = substr( $post_date, 5, 2 );
-        $day   = substr( $post_date, 8, 2 );
-        $year  = substr( $post_date, 0, 4 );
+        $month = (int)substr( $post_date, 5, 2 );
+        $day   = (int)substr( $post_date, 8, 2 );
+        $year  = (int)substr( $post_date, 0, 4 );
 
         $valid_date = wp_checkdate( $month, $day, $year, $post_date );