This mod help you to know what time is how. With it you don't need to minimize Minecraft or watch on smartphone. You can place clock where you want, customize color and transparency, change size of it, etc. If you want to turn off it just set scale to 0.
All config you can see below:
How to get to config menu:
1. Press "Mods" Button
2. Slect Non Game Time mod and press "Config" button
Also tiy can open it in game by pressing 'B' key
You can change key in controls settings
