Listing events from the past

[JaTaSn]

It would be useful to be able to list past events with the terminal client. By making the change

#        start_time = str(current_time.isoformat())
        start_time = str((current_time - relativedelta(days=no_of_days)).isoformat())

in main.py
the terminal client outputs past events, so there is no API restriction to doing this. I would try to add this myself, but I do not know enough python to understand the command line argument parsing.