function call at defined system time?

[snippsat]

There are also libraries that work fine for like schedule, APScheduler, pycron
The two first have i used serval times before,Python job scheduling for humans is maybe the easiest to use.

I would like to use asyncio for that

That's maybe overkill for this task,as usually don't need 1000's task to load at same time for this.
Schedule use simpler Threading if that's needed.

import threading
import time
import schedule


def job():
    print(f"I'm running on thread {threading.current_thread()}")

def run_threaded(job_func):
    job_thread = threading.Thread(target=job_func)
    job_thread.start()

schedule.every(10).seconds.do(run_threaded, job)
schedule.every(10).seconds.do(run_threaded, job)
schedule.every(10).seconds.do(run_threaded, job)

while 1:
    schedule.run_pending()
    time.sleep(1)

APScheduler start separate Thread automatic with schedulers.background

A scheduler that runs in the background using a separate thread (start() will return immediately).