diff --git a/lib/picker.js b/lib/picker.js
index bf072158..f448e948 100644
--- a/lib/picker.js
+++ b/lib/picker.js
@@ -1087,10 +1087,10 @@ PickerConstructor._ = {
 
 
     /**
-     * Tell if something is a date object.
+     * Tell if something resembles a date object.
      */
     isDate: function( value ) {
-        return {}.toString.call( value ).indexOf( 'Date' ) > -1 && this.isInteger( value.getDate() )
+        return value.getDate && this.isInteger( value.getDate() )
     },