diff --git a/UI/WebServerResources/UIxPreferences.js b/UI/WebServerResources/UIxPreferences.js
index 0a76018e6..a07b2fd25 100644
--- a/UI/WebServerResources/UIxPreferences.js
+++ b/UI/WebServerResources/UIxPreferences.js
@@ -39,7 +39,8 @@ function savePreferences(sender) {
 	  sendForm = false;
 	}
         if ($("enableVacationEndDate") && $("enableVacationEndDate").checked) {
-            var endDate = $("vacationEndDate_date").value.asDate();
+            var e = $("vacationEndDate_date");
+            var endDate = e.calendar.prs_date(e.value);
             var now = new Date();
             if (endDate.getTime() < now.getTime()) {
                 showAlertDialog(_("End date of your auto reply must be in the future."));