ShouldNotUpdate :

1. the date time is changing so it is logical that it will be rendered , i see no need to touch shouldComponentUpdate in this scenario
2. even if i remove date time from the returned JSX of ShouldNotUpdate then although render is called it is NOT rendering !!! and its easy to check using F12->customize and control Dev Tools->more tools->Rendering->PaintFlashing . Again no need to touch shouldComponentUpdate