tt/util/str_to_datetime.py

from datetime import datetime as dt


def str_to_datetime(s: str) -> dt:
    s = s.strip()

    try:
        return dt.strptime(s, '%d.%m.%y %H:%M')
    except ValueError:
        pass

    try:
        tim = dt.strptime(s, '%H:%M').time()
        dat = dt.now().date()
        return dt.combine(dat, tim)
    except ValueError:
        pass

    raise ValueError("The given string can not be interpreted as a datetime.")