offsets.py 文件源码

def apply(self, other):
        n = self.n
        other = datetime(other.year, other.month, other.day,
                         other.hour, other.minute, other.second,
                         other.microsecond)
        wkday, days_in_month = tslib.monthrange(other.year, other.month)

        monthsToGo = 3 - ((other.month - self.startingMonth) % 3)
        if monthsToGo == 3:
            monthsToGo = 0

        if n > 0 and not (other.day >= days_in_month and monthsToGo == 0):
            n = n - 1

        other = other + relativedelta(months=monthsToGo + 3 * n, day=31)
        return other