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python 格式化日期

Time模块提供各种与时间相关的功能，常用的方法如下：

time.time()：以秒为单位返回从纪元开始的时间作为浮点数。

time.ctime([secs])：将从epoch开始以秒表示的时间转换为表示本地时间的字符串

time.gmtime（[secs]）：以秒表示的时间转换为UTC格式的结构时间，其中DST标志始终为零。如果未提供秒或没有秒，则使用time（）返回的当前时间。

time.localtime([secs])：类似于gmtime（），但转换为本地时间。如果未提供秒或没有秒，则使用time（）返回的当前时间。当DST应用于给定时间时，DST标志设置为1。

time.sleep(secs)：在给定的秒数内暂停当前线程的执行。

time.strftime(format[, t])：将gmtime（）或localtime（）返回的时间的元组或结构时间转换为format参数指定的字符串。格式参数如下：

Directive	Meaning	Notes
%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.
%d	Day of the month as a decimal number [01,31].
%H	Hour (24-hour clock) as a decimal number [00,23].
%I	Hour (12-hour clock) as a decimal number [01,12].
%j	Day of the year as a decimal number [001,366].
%m	Month as a decimal number [01,12].
%M	Minute as a decimal number [00,59].
%p	Locale’s equivalent of either AM or PM.	(1)
%S	Second as a decimal number [00,61].	(2)
%U	Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0.	(3)
%w	Weekday as a decimal number [0(Sunday),6].
%W	Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0.	(3)
%x	Locale’s appropriate date representation.
%X	Locale’s appropriate time representation.
%y	Year without century as a decimal number [00,99].
%Y	Year with century as a decimal number.
%Z	Time zone name (no characters if no time zone exists).
%%	A literal '%' character.

# -*- coding: utf-8 -*-
 import time
 
 print time.time()
 print time.ctime()
 print time.gmtime()
 print time.localtime()
 time.sleep(3)
 print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime())
 print time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
 print time.strftime('%Y-%m-%d', time.localtime(time.time()))

输出：

1571390853.04

Fri Oct 18 17:27:33 2019

time.struct_time(tm_year=2019, tm_mon=10, tm_mday=18, tm_hour=9, tm_min=27, tm_sec=33, tm_wday=4, tm_yday=291, tm_isdst=0)

time.struct_time(tm_year=2019, tm_mon=10, tm_mday=18, tm_hour=17, tm_min=27, tm_sec=33, tm_wday=4, tm_yday=291, tm_isdst=0)

2019-10-18 17:27:36

2019-10-18 17:27:36

2019-10-18

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