def mother(year=None):
    """
    the 2nd Sunday in May
    :param year: int
    :return: Mother's day
    """
    may_first = datetime.date(_year, 5, 1) if not year else datetime.date(int(year), 5, 1)
    weekday_seq = may_first.weekday()
    return datetime.date(may_first.year, 5, (14 - weekday_seq))
the 2nd Sunday in May
    :param year: int
    :return: Mother's day