How to change Skybox color over time?

[GoreGrinder99]

Could try a light? Make the skybox an actual in-game object without illumination, then put a boxlight over top to change the color and brightness? Not something I've done personally, but it's an idea you could experiment with.

Yes, there is a fadelightto function and pretty much all I could think of but not sure how I would implement it exactly. How would I turn a .dds to a dae but still keep the Skybox effect?