Do you know if that's something you can do on Ren'Py? (I'm not the programmer, so my knowledge is limited.)
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It seems possible with the use of Python - according to the answers in this Ren'Py-Reddit:
https://www.reddit.com/r/RenPy/comments/kknei6/time_date_based_events/
And here on stack-overflow it's even written out a little more precisely already (haven't tried it myself though, but shouldn't be too much of a problem)
https://stackoverflow.com/questions/415511/how-to-get-the-current-time-in-python
Cheers and hope that helps