expressions.py 文件源码

def get_next_value(self, date, field):
        # Figure out the weekday of the month's first day and the number of days in that month
        first_day_wday, last_day = monthrange(date.year, date.month)

        # Calculate which day of the month is the first of the target weekdays
        first_hit_day = self.weekday - first_day_wday + 1
        if first_hit_day <= 0:
            first_hit_day += 7

        # Calculate what day of the month the target weekday would be
        if self.option_num < 5:
            target_day = first_hit_day + self.option_num * 7
        else:
            target_day = first_hit_day + ((last_day - first_hit_day) / 7) * 7

        if target_day <= last_day and target_day >= date.day:
            return target_day