python时间处理

　　

 

1. 下个月的同天
   

   def same_day_of_next_month(obj: datetime.date):
       def last_day_of_current_month(_obj: datetime.date):
           if _obj.month == 12:
               first_day_of_next_month = datetime.date(_obj.year + 1, 1, 1)
           else:
               first_day_of_next_month = datetime.date(_obj.year, _obj.month + 1, 1)
           return first_day_of_next_month - datetime.timedelta(1)
   
       if obj.month == 12:
           return datetime.date(obj.year + 1, 1, obj.day)
       else:
           last_day_of_next_month = last_day_of_current_month(datetime.date(obj.year, obj.month + 1, 1))
           if obj.day > last_day_of_next_month.day:
               return last_day_of_next_month
           else:
               return datetime.date(last_day_of_next_month.year, last_day_of_next_month.month, obj.day)

    

2. 上个月的同天
   

   def same_day_of_prev_month(obj: datetime.date):
       def last_day_of_current_month(_obj: datetime.date):
           if _obj.month == 12:
               first_day_of_next_month = datetime.date(_obj.year + 1, 1, 1)
           else:
               first_day_of_next_month = datetime.date(_obj.year, _obj.month + 1, 1)
           return first_day_of_next_month - datetime.timedelta(1)
   
       if obj.month == 1:
           return datetime.date(obj.year - 1, 12, obj.day)
       else:
           last_day_of_prev_month = last_day_of_current_month(datetime.date(obj.year, obj.month - 1, 1))
           if obj.day > last_day_of_prev_month.day:
               return last_day_of_prev_month
           else:
               return datetime.date(last_day_of_prev_month.year, last_day_of_prev_month.month, obj.day)