python 时间转换

时间格式有字符串、时间数组、时间戳，用到的主要datetime和time

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1.字符串转换成datetime、时间数组

>>> import datetime,time
>>> t1 = '2016-12-25 10:59:12'
>>> t2=datetime.datetime.strptime(t1,'%Y-%m-%d %H:%M:%S') #datetime格式
>>> t2
datetime.datetime(2016, 12, 25, 10, 59, 12)
>>> t3=time.strptime(t1,'%Y-%m-%d %H:%M:%S') #时间数组格式
>>> t3
time.struct_time(tm_year=2016, tm_mon=12, tm_mday=25, tm_hour=10, tm_min=59, tm_sec=12, tm_wday=6, tm_yday=360, tm_isdst=-1)

2. datetime、时间数组转换为字符串

>>> t2=datetime.datetime.strptime(t1,'%Y-%m-%d %H:%M:%S')
>>> t2
datetime.datetime(2016, 12, 25, 10, 59, 12)
>>> t2.strftime('%Y-%m-%d %H:%M:%S')
'2016-12-25 10:59:12'
>>> time.strftime('%Y-%m-%d %H:%M:%S',t3)
'2016-12-25 10:59:12'

3.时间数组转换为时间戳

>>> t3
time.struct_time(tm_year=2016, tm_mon=12, tm_mday=25, tm_hour=10, tm_min=59, tm_sec=12, tm_wday=6, tm_yday=360, tm_isdst=-1)
>>> int(time.mktime(t3))
1482634752

4.时间戳转换为时间数组

>>> t3_timestamp = time.mktime(t3)
>>> time.localtime(t3_timestamp)
time.struct_time(tm_year=2016, tm_mon=12, tm_mday=25, tm_hour=10, tm_min=59, tm_sec=12, tm_wday=6, tm_yday=360, tm_isdst=0)

5.时间戳转换为字符串

>>> t3_timestamp
1482634752.0
>>> time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(t3_timestamp))
'2016-12-25 10:59:12'

6.字符串转换为时间戳

>>> t1
'2016-12-25 10:59:12'
>>> time.mktime(time.strptime(t1,'%Y-%m-%d %H:%M:%S'))
1482634752.0