python取系统日期前一天_python 获取前一天或前N天的日期

简单实现

import datetime

# 获取前1天或N天的日期，beforeOfDay=1：前1天；beforeOfDay=N：前N天

def getdate(self,beforeOfDay):

today = datetime.datetime.now()

# 计算偏移量

offset = datetime.timedelta(days=-beforeOfDay)

# 获取想要的日期的时间

re_date = (today + offset).strftime('%Y-%m-%d')

return re_date

# 获取前一周的所有日期(weeks=1)，获取前N周的所有日期(weeks=N)

def getBeforeWeekDays(self,weeks=1):

# 0,1,2,3,4,5,6,分别对应周一到周日

week = datetime.datetime.now().weekday()

days_list = []

start = 7 * weeks + week

end = week

for index in range(start, end, -1):

day =self.getdate(index) print(day)

#测试

#getBeforeWeekDays(1)

2019-01-07

2019-01-08

2019-01-09

2019-01-10

2019-01-11

2019-01-1