fix(datepicker): set default zero time after no date selected

Closes #1065

src/datepicker/datepicker.js

@@ -217,7 +217,7 @@ angular.module('ui.bootstrap.datepicker', ['ui.bootstrap.position'])
 
       scope.select = function( date ) {
         if ( mode === 0 ) {
-          var dt = new Date( ngModel.$modelValue );
+          var dt = ngModel.$modelValue ? new Date( ngModel.$modelValue ) : new Date(0, 0, 0, 0, 0, 0, 0);
           dt.setFullYear( date.getFullYear(), date.getMonth(), date.getDate() );
           ngModel.$setViewValue( dt );
           refill( true );

src/datepicker/test/datepicker.spec.js

@@ -1294,26 +1294,31 @@ describe('datepicker directive', function () {
       });
     });
   });
-});
 
-describe('datepicker directive with empty initial state', function () {
-  var $rootScope, element;
-  beforeEach(module('ui.bootstrap.datepicker'));
-  beforeEach(module('template/datepicker/datepicker.html'));
-  beforeEach(inject(function(_$compile_, _$rootScope_) {
-    $compile = _$compile_;
-    $rootScope = _$rootScope_;
-    $rootScope.date = null;
-    element = $compile('<datepicker ng-model="$parent.date"></datepicker>')($rootScope);
-    $rootScope.$digest();
-  }));
+  describe('datepicker directive with empty initial state', function () {
+    beforeEach(inject(function() {
+      $rootScope.date = null;
+      element = $compile('<datepicker ng-model="$parent.date"></datepicker>')($rootScope);
+      $rootScope.$digest();
+    }));
 
-  it('is a `<table>` element', function() {
-    expect(element.prop('tagName')).toBe('TABLE');
-    expect(element.find('thead').find('tr').length).toBe(2);
-  });
+    it('is a `<table>` element', function() {
+      expect(element.prop('tagName')).toBe('TABLE');
+      expect(element.find('thead').find('tr').length).toBe(2);
+    });
 
-  it('is shows rows with days', function() {
-    expect(element.find('tbody').find('tr').length).toBeGreaterThan(3);
+    it('is shows rows with days', function() {
+      expect(element.find('tbody').find('tr').length).toBeGreaterThan(3);
+    });
+
+    it('sets default 00:00:00 time for selected date', function() {
+      $rootScope.date = new Date('August 1, 2013');
+      $rootScope.$digest();
+      $rootScope.date = null;
+      $rootScope.$digest();
+
+      clickOption(2, 0);
+      expect($rootScope.date).toEqual(new Date('August 11, 2013 00:00:00'));
+    });
   });
 });