chore(grid): enhance parseDate util method #8350

Author: hanastasov

projects/igniteui-angular/src/lib/core/utils.ts

@@ -109,16 +109,11 @@ export function isDate(value: any): boolean {
  * @hidden
  */
 export function parseDate(value: any): Date | null {
-    if (typeof value === 'number') {
-        return new Date(value);
-    }
-
     // if value is Invalid Date return null
     if (isDate(value)) {
         return !isNaN(value.getTime()) ? value : null;
     }
-
-    return value ? new Date(Date.parse(value)) : null;
+    return value ? new Date(value) : null;
 }
 
 /**