diff --git a/src/Legacy/Common.php b/src/Legacy/Common.php
index 370de752..6d52b60a 100644
--- a/src/Legacy/Common.php
+++ b/src/Legacy/Common.php
@@ -106,15 +106,15 @@ protected function ymdTodmy($data = '')
      */
     public function toTimestamp($input)
     {
-        /*$regex = '^(2[0-9][0-9][0-9])[-](0?[1-9]'
+        $regex = '^(2[0-9][0-9][0-9])[-](0?[1-9]'
             . '|1[0-2])[-](0?[1-9]'
             . '|[12][0-9]'
-            . '|3[01])T([0-9]|0[0-9]'
-            . '|1[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]-(00|01|02|03|04):00$';
+            . '|3[01])T(0[0-9]'
+            . '|1[0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9][-|+](00|01|02|03|04|05|06|07|08|09|10|11|12):00$';
 
         if (!preg_match("/$regex/", $input)) {
-            return '';
-        }*/
+            return 0;
+        }
         return \DateTime::createFromFormat("Y-m-d\TH:i:sP", $input)->getTimestamp();
     }