Check for invalid date

package.nw/lib/gt.js

@@ -11429,9 +11429,9 @@ function workingDateChanged()
   {
     workingTimeValue.value = "00:00";
   }
-  if (workingTimeValue.value.length == 0)
+  if (workingDateValue.value.length == 0)
   {
-    workingTimeValue.value = "1970-01-01";
+    workingDateValue.value = "1970-01-01";
   }
 
   var fields = workingDateValue.value.split("-");