Python:
init python:
daytime = 0
def timepass():
store.daytime += 1
if daytime == 4:
store.daytime = 0
screen blabla():
whatever... action [timepass, Jump("Livingroom")]
you need no arguments for the timepass function, and so you can use it as action without the Function() screen action.
if you need to pass arguments within the Function() screen action, you pass them as kwargs Function(yourFunction, arg1="123").