diff --git a/package.json b/package.json
index 6c8729d7..29eb12b6 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
   },
   "dependencies": {
     "async-validator": "^1.7.1",
-    "core-js": "^2.4.1",
+    "core-js": "^2.5.0",
     "deepmerge": "^1.5.0",
     "popper.js": "^0.6.4",
     "tinycolor2": "^1.4.1"
diff --git a/src/components/date-picker/util.js b/src/components/date-picker/util.js
index 49326333..eb865f32 100644
--- a/src/components/date-picker/util.js
+++ b/src/components/date-picker/util.js
@@ -1,9 +1,17 @@
 import dateUtil from '../../utils/date';
 
 export const toDate = function(date) {
-    date = new Date(date);
-    if (isNaN(date.getTime())) return null;
-    return date;
+    let _date = new Date(date);
+    // IE patch start (#1422)
+    if (isNaN(_date.getTime()) && typeof date === 'string'){
+        _date = date.split('-').map(Number);
+        _date[1] += 1;
+        _date = new Date(..._date);
+    }
+    // IE patch end
+
+    if (isNaN(_date.getTime())) return null;
+    return _date;
 };
 
 export const formatDate = function(date, format) {
diff --git a/src/index.js b/src/index.js
index 25661028..cd1b054f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,5 @@
 // es6 polyfill
+import 'core-js/fn/array/find';
 import 'core-js/fn/array/find-index';
 
 import Affix from './components/affix';