From 92d5522c3759862b4225f5a8bd6bc5e3d7951aac Mon Sep 17 00:00:00 2001
From: "qingwei.li" <cinwell.li@gmail.com>
Date: Fri, 13 Jan 2017 13:43:46 +0800
Subject: [PATCH] DatePicker: fix null value shows 1970, fixed #2388

---
 packages/date-picker/src/util/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/date-picker/src/util/index.js b/packages/date-picker/src/util/index.js
index abaa640ad..3d13a48e8 100644
--- a/packages/date-picker/src/util/index.js
+++ b/packages/date-picker/src/util/index.js
@@ -17,8 +17,8 @@ export const toDate = function(date) {
 };
 
 export const isDate = function(date) {
-  date = new Date(date);
-  if (isNaN(date.getTime())) return false;
+  if (date === null || date === undefined) return false;
+  if (isNaN(new Date(date).getTime())) return false;
   return true;
 };