time内置模块的方法
1、time() 时间戳
time() -> floating point number 浮点数
Return the current time in seconds since the Epoch.
Fractions of a second may be present if the system clock provides them.
import time print(time.time()) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py 1528517838.7509072
这个时间戳是一个秒数，是从1970年凌晨开始算，到现在一共经历了多少秒
现在是2018年，减去1970年，是48年，
48*365*24*60*60=1513728000
哈哈算出来跟上面的差不多，这就是时间戳，每一秒都不一样
时间戳可以可以用来计算2个时间的减法，就是比如我下单的时候是一个时间戳，我支付成功再来一个时间戳，可以计算一下我下单到支付花了多少秒
2、localtime(seconds=None) 结构化时间-当地时间
得到的是一个结构化时间
Convert seconds since the Epoch to a time tuple expressing local time.
When 'seconds' is not passed in, convert the current time instead
import time print(time.localtime()) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py time.struct_time(tm_year=2018, tm_mon=6, tm_mday=9, tm_hour=12, tm_min=36, tm_sec=7, tm_wday=5, tm_yday=160, tm_isdst=0)
那么我们就可以取出来具体的其中的具体的年份或者是时分秒，一周的第几天，一年的第几天
import time a=time.localtime() print(a.tm_year,a.tm_mon,a.tm_mday,a.tm_hour,":",a.tm_min,":",a.tm_sec) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py 2018 6 9 12 : 46 : 1
3、gmtime 也是结构化时间 世界标准化时间-UTC
时间标准时间，跟我们的时间差8个小时
4、mktime(p_tuple)
mktime(tuple) -> floating point number
将结构化时间转换成时间戳
import time print(time.mktime(time.localtime())) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py 1528522939.0
5、strftime(format, p_tuple=None)
将结构化时间转化成字符串时间
%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. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale's equivalent of either AM or PM.
%X就代表时分秒
import time print(time.strftime("%Y-%m-%d %X",time.localtime())) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py 2018-06-09 15:11:04
6、strptime(string, format)
将字符串时间转化为结构化时间
%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. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale's equivalent of either AM or PM.
这里的字符串时间得和后面的结构化时间一一对应才行
import time print(time.strptime("2018:06:09-15:21:36","%Y:%m:%d-%X")) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py time.struct_time(tm_year=2018, tm_mon=6, tm_mday=9, tm_hour=15, tm_min=21, tm_sec=36, tm_wday=5, tm_yday=160, tm_isdst=-1)
7、asctime(p_tuple=None)可以加结构化参数，不加参数默认是当前时间
如果你没有自定义需求时间格式的话，可以之间用这个方法
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
import time print(time.asctime()) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py Sat Jun 9 15:26:45 2018
8、ctime(seconds=None)可以加时间戳参数，不加参数默认是当前时间
跟7这个asctime出来的格式是一样的
print(time.ctime())#不加参数，默认是当前时间 Sat Jun 9 15:34:30 2018 print(time.ctime(1228629586.2798274))#加上时间戳（字符串时间）参数 Sun Dec 7 13:59:46 2008
9、datetime 这个相对来说跟好用，第一种用法比较精细，第二种格式也比较好看
import datetime print(datetime.datetime.now()) print(datetime.datetime.now().strftime("%Y-%m-%d %X")) C:\python35\python3.exe D:/pyproject/day21模块/time模块.py 2018-06-09 15:44:29.870926 2018-06-09 15:44:29