Colored evening, sunset, night & dawn

[PhoenixToME]

When I used to make extremly incomplete games (at about 3%) I used a couple of times colors to give the sense of a sunset or a dawn, of evening and night. A bit bluish on evening, reddish on sunset and dawn, dark-bluish at night, with smooth transitions between them. Something not too strong obviously and still in combo with a brightness effect, but It would be more realistic and probably beautiful to see instead of only a brightness effect. Don't know if it's possible with the engine but I think it is.