offsets.py 文件源码

def apply(self, 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

        return self.getOffsetOfMonth(
            other + relativedelta(months=months, day=1))