https://rexrainbow.github.io/C2RexDoc/c ... awayl.html
With that plugin you can write 'current time' to the local storage, on the right moment.
And retrieve it as 'away time' the next time the game starts.
In the topic about the plugin you also find a plugin to translate the stored 'numbers' to readable dates, hours and second.
It always comes down to that principle. Store current time somewhere, retrieve & calculate.
You can do this with out a 3th party plugin, use local storage and some way to get the current time.
Like : https://www.scirra.com/tutorials/940/ho ... -a-project
Now, If you dont trust the user, they can set their clock as they wish, then you need to get the current time from another source than users device.
You can use php to communicate with a time server, but i did not learn that yet myself.
And, you need to store that time outside the users device, another thing that i did not yet do myself.