Trying to have my mob activitly avoid the sun

So I am trying to make a procedure where my mob hides under a shaded area and avoid the sun, just like the skeleton in default minecraft. I use the "move indoors if possible" in ai and goals which it seems to work, but sometimes the mob forgets its in the sunlight moreover just stand there and die.The mob also try to chase the targeted entity when they are accidently push under the sun, instead of returning back to the shaded area. Does anyone have a better solution to this problem?