Badges update automatically and link to the mod page on MineUniverse.
As the Sun rises, it will soon begin to hurt.
An indicator in the top left corner

will signal you that you are exposed to deadly sunlight.
This icon has 3 Stages:
After leaving the sunlight you have to cool down a bit before you can dare to enter it again, or you will still be at stage 2 or stage 3.
The sunlight gets more dangerous the higher the sun has risen. At dawn or evening you can easily survive by standing below trees. At noon this is not going to help.
This mod is pretty new, if you have any suggestions how it can be improved let me know in the comments.