there's a module for working with date and time: https://docs.godotengine.org/en/stable/classes/class_time.html#class-time-method-get-datetime-string-from-datetime-dict
save to variable system unix time on timer start, then whenever you need to update the timer visual calculate the difference between current unix time and the saved value, you can get a time string or time dict from the resulting integer to generate a string for the timer formatted as you like.
the timer visual itself then can just be a label/richtextlabel in a canvas layer whose text you update periodically
Inherits: Object Time singleton for working with time. Description: The Time singleton allows converting time between various formats and also getting time information from the system. This class c...
Still dont know how to make it tho