This is a paid asset, but now you can download Ultimate Digital Clock System for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Ultimate Digital Clock System v1.0
real-time clock system for only $4.99 This is a simple tool that enables user to keep track of Time , this tool will let it’s user manipulate Time, increase the speed of time in game and also progress at the original speed of real world time.
features
users can increase speed of time
it has an alarm system
it can be used keep track of events in game
it can be set to progress with real world time
user can change and set the time
time can be displayed in 24 or 12 hours