In short, it adds a menu for the mod which lets you customize each and every heist in the game to a certain time! It also includes a Random option which will load a random time of day for that certain heist. :D
This mod takes the current list of heists in the game so the options will update every time a new heist is added. This mod includes auto-updates but not sure if I'm updating this.
NOTE: There might be some error text in options, Overkill didn't add proper localization for those text so I don't know which heist it affects. Don't change the options if you're unsure which heist is affected! There's also duplicates of the same heists so change them accordingly (They're not actually the same since they only vary just slightly.)