fix(datepicker): use time-insensitive comparison for min/max.

src/components/datepicker/datePicker.js

@@ -367,18 +367,21 @@
    * @param {Date=} opt_date Date to check. If not given, defaults to the datepicker's model value.
    */
   DatePickerCtrl.prototype.updateErrorState = function(opt_date) {
-    var date = opt_date || this.date;
+    // Force all dates to midnight in order to ignore the time portion.
+    var date = this.dateUtil.createDateAtMidnight(opt_date || this.date);
 
     // Clear any existing errors to get rid of anything that's no longer relevant.
     this.clearErrorState();
 
     if (this.dateUtil.isValidDate(date)) {
       if (this.dateUtil.isValidDate(this.minDate)) {
-        this.ngModelCtrl.$setValidity('mindate', date >= this.minDate);
+        var minDate = this.dateUtil.createDateAtMidnight(this.minDate);
+        this.ngModelCtrl.$setValidity('mindate', date >= minDate);
       }
 
       if (this.dateUtil.isValidDate(this.maxDate)) {
-        this.ngModelCtrl.$setValidity('maxdate', date <= this.maxDate);
+        var maxDate = this.dateUtil.createDateAtMidnight(this.maxDate);
+        this.ngModelCtrl.$setValidity('maxdate', date <= maxDate);
       }
 
       if (angular.isFunction(this.dateFilter)) {

src/components/datepicker/datePicker.spec.js

@@ -155,6 +155,40 @@ describe('md-date-picker', function() {
       expect(controller.ngModelCtrl.$error['maxdate']).toBe(true);
     });
 
+    it('should ignore the time portion when comparing max-date', function() {
+      // Given that selected date is the same day as maxdate but at a later time.
+      pageScope.maxDate = new Date(2015, JAN, 1, 5, 30);
+      pageScope.myDate = new Date(2015, JAN, 1, 7, 30);
+      pageScope.$apply();
+
+      expect(controller.ngModelCtrl.$error['maxdate']).toBeFalsy();
+    });
+
+    it('should ignore the time portion when comparing min-date', function() {
+      // Given that selected date is the same day as mindate but at an earlier time.
+      pageScope.minDate = new Date(2015, JAN, 1, 5, 30);
+      pageScope.myDate = new Date(2015, JAN, 1);
+      pageScope.$apply();
+
+      expect(controller.ngModelCtrl.$error['mindate']).toBeFalsy();
+    });
+
+    it('should allow selecting a date exactly equal to the max-date', function() {
+      pageScope.maxDate = new Date(2015, JAN, 1);
+      pageScope.myDate = new Date(2015, JAN, 1);
+      pageScope.$apply();
+
+      expect(controller.ngModelCtrl.$error['maxdate']).toBeFalsy();
+    });
+
+    it('should allow selecting a date exactly equal to the min-date', function() {
+      pageScope.minDate = new Date(2015, JAN, 1);
+      pageScope.myDate = new Date(2015, JAN, 1);
+      pageScope.$apply();
+
+      expect(controller.ngModelCtrl.$error['mindate']).toBeFalsy();
+    });
+
     describe('inside of a form element', function() {
       var formCtrl;