diff --git a/src/js/angular-datepicker.js b/src/js/angular-datepicker.js
index e32c6a0..5f040ff 100644
--- a/src/js/angular-datepicker.js
+++ b/src/js/angular-datepicker.js
@@ -376,7 +376,7 @@
           }
           , unregisterDataSetWatcher = $scope.$watch('dateSet', function dateSetWatcher(newValue) {
 
-            if (newValue) {
+            if (newValue && !isNaN(Date.parse(newValue))) {
 
               date = new Date(newValue);