月加减

月加减.py

def add_months(dt, months):
    """
    月加减
    :param dt: datetime 实例
    :param months: 加多少月
    :return:
    """
    month = dt.month - 1 + months
    year = dt.year + month / 12
    month = month % 12 + 1
    day = min(dt.day, calendar.monthrange(year, month)[1])
    return dt.replace(year=year, month=month, day=day)