diff --git a/js/tbl_change.js b/js/tbl_change.js
index 98f43b0ecc..07df7a7418 100644
--- a/js/tbl_change.js
+++ b/js/tbl_change.js
@@ -100,7 +100,7 @@ function isDate(val, tmstmp)
     }
     val = arrayVal.join("-");
     var pos = 2;
-    var dtexp = new RegExp(/^([0-9]{4})-(((01|03|05|07|08|10|12)-((0[0-9])|([1-2][0-9])|(3[0-1])))|((02|04|06|09|11)-((0[0-9])|([1-2][0-9])|30)))$/);
+    var dtexp = new RegExp(/^([0-9]{4})-(((01|03|05|07|08|10|12)-((0[1-9])|([1-2][0-9])|(3[0-1])))|((02|04|06|09|11)-((0[1-9])|([1-2][0-9])|30)))$/);
     if (val.length == 8) {
         pos = 0;
     }