技術標籤：python

import time
import datetime

#-----獲取當天前日期-------
#1.
now_date=time.strftime('%Y%m%d,周%w',time.localtime())
#2.
now_date2 = datetime.datetime.now().strftime('%Y-%m-%d')   #不加.strftime('%Y-%m-%d'),就獲取具體到秒
#3.
t = time.localtime()
nowdate3 = '{}-{}-{}'.format(t.tm_year,t.tm_mon,t.tm_mday)
 



#------獲取前一天或前N天的日期--------------
def get_beforedate(n):           #獲取n天前的日期資料   
    today = datetime.datetime.now()
    offset = datetime.timedelta(days=n)
    re_date = (today-offset).strftime('%Y%m%d')
    return re_date

#------獲取當前是一年的第幾周---------------
week = datetime.datetime.now().weekday(
 
)
month = datetime.datetime.now().month   #or 'day'

if __name__ == "__main__":
    print(now_date)
    print(now_date2)
    print(now_date3)
    print(week)
    print(month)
    print(get_beforedate(100))    #獲取第100天前的日期