diff --git a/src/util/datetime-util.ts b/src/util/datetime-util.ts
index 264390da37..c8ad95c101 100644
--- a/src/util/datetime-util.ts
+++ b/src/util/datetime-util.ts
@@ -242,7 +242,7 @@ export function updateDate(existingData: DateTimeData, newData: any) {
         return;
       }
 
-    } else if ((isPresent(newData.year) || isPresent(newData.hour))) {
+    } else if ((isPresent(newData.year) || isPresent(newData.hour) || isPresent(newData.month) || isPresent(newData.day) || isPresent(newData.minute) || isPresent(newData.second))) {
       // newData is from of a datetime picker's selected values
       // update the existing DateTimeData data with the new values
 
diff --git a/src/util/test/datetime-util.spec.ts b/src/util/test/datetime-util.spec.ts
index dc4e6003f4..f42acf5080 100644
--- a/src/util/test/datetime-util.spec.ts
+++ b/src/util/test/datetime-util.spec.ts
@@ -825,6 +825,74 @@ describe('parseISODate', () => {
 
 });
 
+describe('updateDate', () => {
+
+  it('should update year in existing date', () => {
+    var existingDate = { year: 2016, month: 10, day: 1 };
+    datetime.updateDate(existingDate, { year: { value: 2017 } });
+    expect(existingDate.year).toEqual(2017);
+  });
+
+  it('should update month in existing date', () => {
+    var existingDate = { year: 2016, month: 10, day: 1 };
+    datetime.updateDate(existingDate, { month: { value: 11 } });
+    expect(existingDate.month).toEqual(11);
+  });
+
+  it('should update day in existing date', () => {
+    var existingDate = { year: 2016, month: 10, day: 1 };
+    datetime.updateDate(existingDate, { day: { value: 2 } });
+    expect(existingDate.day).toEqual(2);
+  });
+
+  it('should update hour in existing time', () => {
+    var existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 11 } });
+    expect(existingDate.hour).toEqual(11);
+  });
+
+  it('should update minute in existing time', () => {
+    var existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { minute: { value: 45 } });
+    expect(existingDate.minute).toEqual(45);
+  });
+
+  it('should update second in existing time', () => {
+    var existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { second: { value: 10 } });
+    expect(existingDate.second).toEqual(10);
+  });
+
+  it('should update hour PM in existing time', () => {
+    var existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 1 }, ampm: { value: 'pm' }});
+    expect(existingDate.hour).toEqual(13);
+
+    existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 12 }, ampm: { value: 'pm' }});
+    expect(existingDate.hour).toEqual(12);
+
+    existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 4 }, ampm: { value: 'pm' }});
+    expect(existingDate.hour).toEqual(16);
+  });
+
+  it('should update hour AM in existing time', () => {
+    var existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 1 }, ampm: { value: 'am' }});
+    expect(existingDate.hour).toEqual(1);
+
+    existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 12 }, ampm: { value: 'am' }});
+    expect(existingDate.hour).toEqual(0);
+
+    existingDate = { hour: 10, minute: 30, second: 0 };
+    datetime.updateDate(existingDate, { hour: { value: 4 }, ampm: { value: 'am' }});
+    expect(existingDate.hour).toEqual(4);
+  });
+
+});
+
 // pt-br
 var customLocale: datetime.LocaleData = {
   dayNames: [