diff --git a/components/calendar/date-table.component.ts b/components/calendar/date-table.component.ts
index 4b00eb3c7cf..98ddd33b819 100644
--- a/components/calendar/date-table.component.ts
+++ b/components/calendar/date-table.component.ts
@@ -106,9 +106,12 @@ export class DateTableComponent implements OnInit, OnChanges {
   }
 
   private changeValueFromInside(value: CandyDate): void {
-    if (this.value !== value) {
-      this.valueChange.emit(value);
-    }
+    // Only change date not change time
+    const newValue = this.value
+      .setYear(value.getYear())
+      .setMonth(value.getMonth())
+      .setDate(value.getDate());
+    this.valueChange.emit(newValue);
   }
 
   private makeHeadWeekDays(): WeekDayLabel[] {
diff --git a/components/date-picker/nz-date-picker.component.spec.ts b/components/date-picker/nz-date-picker.component.spec.ts
index 8de67365b3f..24e91d996d1 100644
--- a/components/date-picker/nz-date-picker.component.spec.ts
+++ b/components/date-picker/nz-date-picker.component.spec.ts
@@ -642,6 +642,20 @@ describe('NzDatePickerComponent', () => {
       expect((queryFromOverlay('input.ant-calendar-input') as HTMLInputElement).value).toBe('2018-11-11 00:22:33');
     }));
 
+    it('should not reset time', fakeAsync(() => {
+      fixtureInstance.nzValue = new Date('2019-08-02 13:03:33');
+      fixtureInstance.nzShowTime = true;
+      fixture.detectChanges();
+      openPickerByClickTrigger();
+
+      dispatchMouseEvent(queryFromOverlay('.ant-calendar-cell > .ant-calendar-date'), 'click');
+
+      fixture.detectChanges();
+      flush();
+      fixture.detectChanges();
+      expect((queryFromOverlay('input.ant-calendar-input') as HTMLInputElement).value).toBe('2019-07-29 13:03:33');
+    }));
+
     it('should support nzShowTime.nzFormat', fakeAsync(() => {
       fixtureInstance.nzShowTime = { nzFormat: 'HH:mm' };
       fixture.detectChanges();