The 'from-time' attribute reported by activities.current is a malformed datetime.datetime.
The date is 1900-01-01 but should be the actual date.

{'attributes': {'comment': 'test',
'date': datetime.date(2023, 8, 22),
'from-time': datetime.datetime(1900, 1, 1, 17, 58, 22),
'not-billable': False,
'review': False,
'to-time': None,
'transferred': False},
'id': '176718',
'relationships': {'task': {'data': {'id': '3604039', 'type': 'tasks'}},
'user': {'data': {'id': '288', 'type': 'users'}}},
'type': 'activities'}

I did not test if this is a problem somewhere else, but I suspect it.