How to make a Timer

How do I make a countdown timer for a soccer game or another form of timer?
I read another thread about a timer, but I didn’t understand how to make it?
Can you please help me with this or maybe make a video to show it?

I just added the documentation for the Stop Watch layer in mimoLive which let you create all kind of timers:

(Here is how to add layers and work with them in mimoLive: )

Please let me know if this is what you are looking for!