Same here, widget time won`t change. Had no trouble with my s5

[Android Central Question]

Time won't change on s8 wiget

 

[hallux]

There's a discussion on this in the S8 forum - https://forums.androidcentral.com/samsung-galaxy-s8-and-s8-plus/874522-widget-time.html

I suggest joining so you can join the discussion there. See this link for instructions on how to join Android Central.