time模块

#!/urs/bin/env python
# -*- coding:utf-8 -*-
import time
print(time.time())
# 返回时间戳
print(time.sleep(5))
# 线程推迟指定时间运行
print(time.localtime())
# 返回本地时间 的struct_time对象格式
print(time.mktime(time.localtime()))
# 将一个时间对象（struct_time）转成时间戳
print(time.ctime(time.time()))

# 把一个时间戳转化成time.asctime的形式。

print(time.asctime(time.localtime())) 

# 把时间戳或时间对象（struct_time）转成time.asctime()的形式 

print("#"*80) 

print(time.strftime("%y-%m-%d %X", time.localtime())) 

print(time.strftime("%Y-%m-%d %X", time.gmtime())) 

# time.strftime(format,t)把一个代表时间元组或者struct_time(time.gmtime()和time.localtime())转化成时间字符串,t未指定，将传入time.localtime()。 

print("*"*80) 

print(time.strptime("2018-03-26 07:57", "%Y-%m-%d %H:%M")) 

# 把一个格式化时间字符串转化成struct_tim

1522051889.3851166
None
time.struct_time(tm_year=2018, tm_mon=3, tm_mday=26, tm_hour=16, tm_min=11, tm_sec=34, tm_wday=0, tm_yday=85, tm_isdst=0)
1522051894.0
Mon Mar 26 16:11:34 2018
Mon Mar 26 16:11:34 2018
################################################################################
18-03-26 16:11:34
2018-03-26 08:11:34
********************************************************************************
time.struct_time(tm_year=2018, tm_mon=3, tm_mday=26, tm_hour=7, tm_min=57, tm_sec=0, tm_wday=0, tm_yday=85, tm_isdst=-1)

时间戳：通常来说，时间戳表示的是从1970年1月1日00:00:00开始按秒计算的偏移量。time.time返回float类型。

元组方式：struct_time元组共有9个元素，返回struct_time的函数有gmtime()   ,localtime(),  strptime().

                   属性                         　　　　 值

　　　　  tm_year (年)　　　　　　　　2018

        　　 tm_mon（月）　　　　　　　　1-12

　　　     tm_mdy（日） 　　　　　　　　1-30

                tm_hour（时）　　　　　　　　0-23

   　　　   tm_min（分）　　　　　　　　0-59

   　　　　tm_sec（秒）　　　　　　　　0-60

　　　　  tm_wday（周）         　　　　　0-6

　　　　 tm_yday（一年中的第几天）   　　1-366

　　　　 tm_isdst（是否是夏令时）  　　默认为-1

常见格式：

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 offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59].
%Z	Time zone name (no characters if no time zone exists).
%%	A literal '%' character.

将时间戳转为字符串格式
print(time.gmtime(time.time()-86640)) #将utc时间戳转换成struct_time格式
print(time.strftime("%Y-%m-%d %H:%M:%S",time.gmtime()) ) #将utc struct_time格式转成指定的字符串格式

日期字符串 转成  时间戳
 string_2_struct = time.strptime("2016/05/22","%Y/%m/%d") #将 日期字符串 转成 struct时间对象格式
 print(string_2_struct)

 struct_2_stamp = time.mktime(string_2_struct) #将struct时间对象转成时间戳
 print(struct_2_stamp)



datetime模块

#!/urs/bin/evn python
# -*- coding:utf-8 -*-
 #时间加减
import datetime
import time
print(datetime.datetime.now())
# 返回2018-03-26 17:23:03.617732
print(datetime.datetime.time(datetime.datetime.now()))
# 返回17:23:03.617732
print(datetime.time(3))
# 00:00:00
print(datetime.date.fromtimestamp(time.time()))
# 时间戳直接转成日期格式 2018-03-26
print(datetime.timedelta(3))
# 返回3 days, 0:00:00
"""def __new__(cls, days=None, seconds=None, microseconds=None, milliseconds=None, minutes=None, hours=None, weeks=None)
"""
# 时间计算
print(datetime.datetime.now()+datetime.timedelta(3))
# 加3天
print(datetime.datetime.now()-datetime.timedelta(3))
# 减3天
print(datetime.datetime.now()-datetime.timedelta(hours=3))
# 减3小时
print(datetime.datetime.now()+datetime.timedelta(minutes=3))
# 加3分钟

# 时间替换
c_time  = datetime.datetime.now()
print(c_time.replace(minute=3, hour=2)) #时间替换
print(c_time.replace(2017, 5, minute=3, hour=2)) #时间替换
print(c_time.replace(2017,5,12, 2,44,23))

2018-03-26 17:52:35.131057
17:52:35.132057
03:00:00
2018-03-26
3 days, 0:00:00
2018-03-29 17:52:35.132057
2018-03-23 17:52:35.132057
2018-03-26 14:52:35.132057
2018-03-26 17:55:35.132057
2018-03-26 02:03:35.132057
2017-05-26 02:03:35.132057
2017-05-12 02:44:23.132057