offsets.py 文件源码

def apply(self, other):
        base = other
        offsetOfMonth = self.getOffsetOfMonth(other)

        if offsetOfMonth > other:
            if self.n > 0:
                months = self.n - 1
            else:
                months = self.n
        elif offsetOfMonth == other:
            months = self.n
        else:
            if self.n > 0:
                months = self.n
            else:
                months = self.n + 1

        other = self.getOffsetOfMonth(
            other + relativedelta(months=months, day=1))
        other = datetime(other.year, other.month, other.day, base.hour,
                         base.minute, base.second, base.microsecond)
        return other