If it's the sun and moon lighting you are referring to, it should be quite easy to do.
-First, create a round gradient the color of the sun (can be done on a black background if you want), and a sun sprite.
-Animate the sun sprite moving across the sky on a layer underneath your foreground layers.
-Make sure the gradient is on the top layer above the foreground layers. (if you made your gradient on a black background, set the blending mode to 'add')
-Create an event that sets position of the gradient to the current sun position every tick.