[ADF-3494] fix formatting for date columns (#3733)

* fix date formats for columns

* fix date formatting for columns

lib/core/datatable/components/datatable/datatable-cell.component.spec.ts

@@ -0,0 +1,37 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { DateCellComponent } from './date-cell.component';
+
+describe('DataTableCellComponent', () => {
+    it('should use medium format by default', () => {
+        const component = new DateCellComponent(null);
+        expect(component.format).toBe('medium');
+    });
+
+    it('should use column format', () => {
+        const component = new DateCellComponent(null);
+        component.column = {
+            key: 'created',
+            type: 'date',
+            format: 'longTime'
+        };
+
+        component.ngOnInit();
+        expect(component.format).toBe('longTime');
+    });
+});