import datetime

import time

string转datetime

str = '2012-11-19'

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

date_time

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

datetime转string

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

                '2012-11-19'

datetime转时间戳

time_time = time.mktime(date_time.timetuple())

time_time

                1353254400.0

时间戳转string

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

                '2012-11-19'

date转datetime

date = datetime.date.today()

date

datetime.date(2012,11,19)

datetime.datetime.strptime(str(date),'%Y-%m-%d') #将date转换为str，在由str转换为datetime

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