learn python datetime
>>> from datetime import date, time, datetime
>>> today = date.today()
>>> today
datetime.date(2020, 1, 24)
>>> now = datetime.now()
>>> now
datetime.datetime(2020, 1, 24, 14, 4, 57, 10015)
>>> current_time = time(now.hour, now.minute, now.second)
>>> datetime.combine(today, current_time)
datetime.datetime(2020, 1, 24, 14, 4, 57)