python之time模組

wadeson發表於2017-07-25
Python
import time
時間戳時間：從1970到現在的秒數，time.time()
>>> time.time()
1500964794.3408804
格式化字串：20170627 21:30:45

元祖：struct_time共九個元素，結構化時間元祖
>>> time.localtime()
time.struct_time(tm_year=2017, tm_mon=7, tm_mday=25, tm_hour=14, tm_min=40, tm_sec=6, tm_wday=1, tm_yday=206, tm_isdst=0)

取出年份：
>>> x = time.localtime()
>>> x
time.struct_time(tm_year=2017, tm_mon=7, tm_mday=25, tm_hour=15, tm_min=23, tm_sec=57, tm_wday=1, tm_yday=206, tm_isdst=0)
>>> x.tm_year
2017

>>> time.gmtime()
time.struct_time(tm_year=2017, tm_mon=7, tm_mday=25, tm_hour=7, tm_min=12, tm_sec=15, tm_wday=1, tm_yday=206, tm_isdst=0)


將結構化元祖時間轉化為時間戳：
>>> x = time.localtime()
>>> x
time.struct_time(tm_year=2017, tm_mon=7, tm_mday=25, tm_hour=14, tm_min=44, tm_sec=59, tm_wday=1, tm_yday=206, tm_isdst=0)
>>> time.mktime(x)
1500965099.0

將結構化元祖時間轉化為格式化字串時間：
>>> time.strftime("%Y-%m-%d %H:%M:%S", x)
'2017-07-25 14:44:59'
字串格式化時間格式：format
　　strftime(...)
    strftime(format[, tuple]) -> string

    Convert a time tuple to a string according to a format specification.
    See the library reference manual for formatting codes. When the time tuple
    is not present, current time as returned by localtime() is used.

    Commonly used format codes:

    %Y  Year with century as a decimal number.
    %m  Month as a decimal number [01,12].
    %d  Day of the month as a decimal number [01,31].
    %H  Hour (24-hour clock) as a decimal number [00,23].
    %M  Minute as a decimal number [00,59].
    %S  Second as a decimal number [00,61].
    %z  Time zone offset from UTC.
    %a  Locale's abbreviated weekday name.
    %A  Locale's full weekday name.
    %b  Locale's abbreviated month name.
    %B  Locale's full month name.
    %c  Locale's appropriate date and time representation.

將格式化字串時間轉化為結構化元祖時間：
strptime(...)
    strptime(string, format) -> struct_time
>>> time.strptime('2017-07-25 14:44:59',"%Y-%m-%d %H:%M:%S")
time.struct_time(tm_year=2017, tm_mon=7, tm_mday=25, tm_hour=14, tm_min=44, tm_sec=59, tm_wday=1, tm_yday=206, tm_isdst=-1)

將結構化元祖時間轉化為字串：
asctime(...)
    asctime([tuple]) -> string

    Convert a time tuple to a string, e.g. 'Sat Jun 06 16:26:11 1998'.
    When the time tuple is not present, current time as returned by localtime()
    is used.

>>> time.asctime(x)
'Tue Jul 25 14:44:59 2017'

將時間戳轉化為string：

>>> time.ctime(time.time())

'Tue Jul 25 15:16:11 2017'

>>> time.timezone
-28800             ---->相隔8個小時，這個是秒為單位

>>> time.altzone
-32400             -----》夏令營相隔時間

import datetime
>>> datetime.datetime.now()                  獲取當前時間：
datetime.datetime(2017, 7, 25, 15, 17, 30, 899516)
>>> print(datetime.datetime.now())         格式化字串時間
2017-07-25 15:17:59.255676

獲取三天後的時間：

>>> print(datetime.datetime.now() + datetime.timedelta(3))
2017-07-28 15:20:18.179573

 

獲取三天前的時間：

>>> print(datetime.datetime.now() + datetime.timedelta(-3))
2017-07-22 15:21:25.385973

 

獲取當前時間後三個小時：

>>> print(datetime.datetime.now() + datetime.timedelta(hours=3))
2017-07-25 18:22:05.528957

 

獲取當前時間後30分鐘：

>>> print(datetime.datetime.now() + datetime.timedelta(minutes=30))
2017-07-25 15:52:52.346930

 

 
 
 
 




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