python中date、datetime、string的相互转换

首先引入：

import datetime
import time

1、string转datetime

str = '2012-11-19'
date_time = datetime.datetime.strptime(str,'%Y-%m-%d')

2、datetime转string

date_time=datetime.datetime(2012,11,19,0,0)

date_time.strftime('%Y-%m-%d')

3、datetime转时间戳

date_time=2012-11-19'
time_time = time.mktime(date_time.timetuple())

4、时间戳转string

time_time=1353254400.0
time.strftime('%Y-%m-%d',time.localtime(time_time))