It’s surprisingly easy to manipulate times of the day when you are working with V-Ray Sun. But like any other light source on offer, be it V-Ray or integrated into 3ds Max its self, it requires you do some research and experimenting first to get it right.
I did some test renders working out this my self, and I did some color correction too once I got the renders I wanted. But nothing else really. My experience is that too much of Photoshop in renders is not a good idea. It should only make some light changes, fix minor odd occurrences, etc. Nothing more.