python中date、datetime、string的相互转换

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)