This isn't Burger King, you can't have it your way. Ya, I think I got your point.
If you want daylight, go to Taris.
If you want nighttime, go to Nar Shadaa.
If you want sunset, go outside.
If you want to run up a moutain, go outside.
Other than that, strap on your lightsaber and do something productive for the gaming community instead of crying about sunsets on a video game.