fix(input[date]): correctly parse 2-digit years

When parsing a date string value, AngularJS uses `new Date(year, ...)`
to create a Date object and assign it to the model. In the constructor,
2-digit years map to 1900-1999, so the created Date object has the wrong
value for year.
This commit fixes it, by explicitly using `setFullYear()` to set the
year to the correct value, when necessary.

Fixes angular#16537

Author: gkalpak

src/ng/directive/input.js

@@ -1415,7 +1415,7 @@ function weekParser(isoWeek, existingDate) {
 }
 
 function createDateParser(regexp, mapping) {
-  return function(iso, date) {
+  return function(iso, previousDate) {
     var parts, map;
 
     if (isDate(iso)) {
@@ -1437,15 +1437,15 @@ function createDateParser(regexp, mapping) {
 
       if (parts) {
         parts.shift();
-        if (date) {
+        if (previousDate) {
           map = {
-            yyyy: date.getFullYear(),
-            MM: date.getMonth() + 1,
-            dd: date.getDate(),
-            HH: date.getHours(),
-            mm: date.getMinutes(),
-            ss: date.getSeconds(),
-            sss: date.getMilliseconds() / 1000
+            yyyy: previousDate.getFullYear(),
+            MM: previousDate.getMonth() + 1,
+            dd: previousDate.getDate(),
+            HH: previousDate.getHours(),
+            mm: previousDate.getMinutes(),
+            ss: previousDate.getSeconds(),
+            sss: previousDate.getMilliseconds() / 1000
           };
         } else {
           map = { yyyy: 1970, MM: 1, dd: 1, HH: 0, mm: 0, ss: 0, sss: 0 };
@@ -1456,7 +1456,15 @@ function createDateParser(regexp, mapping) {
             map[mapping[index]] = +part;
           }
         });
-        return new Date(map.yyyy, map.MM - 1, map.dd, map.HH, map.mm, map.ss || 0, map.sss * 1000 || 0);
+
+        var date = new Date(map.yyyy, map.MM - 1, map.dd, map.HH, map.mm, map.ss || 0, map.sss * 1000 || 0);
+        if (map.yyyy < 100) {
+          // In the constructor, 2-digit years map to 1900-1999.
+          // Use `setFullYear()` to set the correct year.
+          date.setFullYear(map.yyyy);
+        }
+
+        return date;
       }
     }
 

test/ng/directive/inputSpec.js

@@ -3,20 +3,18 @@
 /* globals generateInputCompilerHelper: false */
 
 describe('input', function() {
-  var helper = {}, $compile, $rootScope, $browser, $sniffer, $timeout, $q;
+  var helper = {}, $compile, $rootScope, $browser, $sniffer;
 
   // UA sniffing to exclude Edge from some date input tests
   var isEdge = /\bEdge\//.test(window.navigator.userAgent);
 
   generateInputCompilerHelper(helper);
 
-  beforeEach(inject(function(_$compile_, _$rootScope_, _$browser_, _$sniffer_, _$timeout_, _$q_) {
+  beforeEach(inject(function(_$compile_, _$rootScope_, _$browser_, _$sniffer_) {
     $compile = _$compile_;
     $rootScope = _$rootScope_;
     $browser = _$browser_;
     $sniffer = _$sniffer_;
-    $timeout = _$timeout_;
-    $q = _$q_;
   }));
 
 
@@ -1556,6 +1554,20 @@ describe('input', function() {
 
       expect(inputElm).toBeValid();
     });
+
+
+    it('should correctly handle 2-digit years', function() {
+      helper.compileInput('<input type="datetime-local" ng-model="value" name="alias" />');
+
+      helper.changeInputValueTo('0001-01-01T12:34:00');
+      expect($rootScope.value.getFullYear()).toBe(1);
+
+      helper.changeInputValueTo('0099-01-01T12:34:00');
+      expect($rootScope.value.getFullYear()).toBe(99);
+
+      helper.changeInputValueTo('0100-01-01T12:34:00');
+      expect($rootScope.value.getFullYear()).toBe(100);
+    });
   });
 
 
@@ -2323,9 +2335,9 @@ describe('input', function() {
 
     it('should allow Date objects as valid ng-max values', function() {
       $rootScope.max = new Date(2012, 1, 1, 1, 2, 0);
-      var inputElm = helper.compileInput('<input type="datetime-local" ng-model="value" name="alias" ng-max="max" />');
+      var inputElm = helper.compileInput('<input type="date" ng-model="value" name="alias" ng-max="max" />');
 
-      helper.changeInputValueTo('2014-01-01T12:34:00');
+      helper.changeInputValueTo('2014-01-01');
       expect(inputElm).toBeInvalid();
 
       $rootScope.max = new Date(2013, 1, 1, 1, 2, 0);
@@ -2342,9 +2354,9 @@ describe('input', function() {
 
     it('should allow Date objects as valid ng-min values', function() {
       $rootScope.min = new Date(2013, 1, 1, 1, 2, 0);
-      var inputElm = helper.compileInput('<input type="datetime-local" ng-model="value" name="alias" ng-min="min" />');
+      var inputElm = helper.compileInput('<input type="date" ng-model="value" name="alias" ng-min="min" />');
 
-      helper.changeInputValueTo('2010-01-01T12:34:00');
+      helper.changeInputValueTo('2010-01-01');
       expect(inputElm).toBeInvalid();
 
       $rootScope.min = new Date(2014, 1, 1, 1, 2, 0);
@@ -2358,6 +2370,21 @@ describe('input', function() {
       expect(inputElm).toBeValid();
     });
 
+
+    it('should correctly handle 2-digit years', function() {
+      helper.compileInput('<input type="date" ng-model="value" name="alias" />');
+
+      helper.changeInputValueTo('0001-01-01');
+      expect($rootScope.value.getFullYear()).toBe(1);
+
+      helper.changeInputValueTo('0099-01-01');
+      expect($rootScope.value.getFullYear()).toBe(99);
+
+      helper.changeInputValueTo('0100-01-01');
+      expect($rootScope.value.getFullYear()).toBe(100);
+    });
+
+
     describe('ISO_DATE_REGEXP', function() {
       var dates = [
         // Validate date