diff --git a/html/pages/graphs.inc.php b/html/pages/graphs.inc.php
index cd4f6181b..b3f6a36b5 100644
--- a/html/pages/graphs.inc.php
+++ b/html/pages/graphs.inc.php
@@ -118,8 +118,8 @@ if (!$auth)
         function submitCustomRange(frmdata) {
             var reto = /to=([0-9])+/g;
             var refrom = /from=([0-9])+/g;
-            var tsto = new Date(frmdata.dtpickerto.value.replace(' ', 'T')+":00.000Z");
-            var tsfrom = new Date(frmdata.dtpickerfrom.value.replace(' ', 'T')+":00.000Z");
+            var tsto = new Date(frmdata.dtpickerto.value.replace('-', '/')+":00");
+            var tsfrom = new Date(frmdata.dtpickerfrom.value.replace('-', '/')+":00");
             tsto = tsto.getTime() / 1000;
             tsfrom = tsfrom.getTime() / 1000;
             frmdata.selfaction.value = frmdata.selfaction.value.replace(reto, 'to=' + tsto);