python time datetime模块常用

#_*_coding:utf-8_*_
__author__ = 'Alex Li'

import time

# time.strftime("%Y-%m-%d %H:%I:%S", time.localtime( time.time() ) ) 
# print(time.clock()) #返回处理器时间,3.3开始已废弃 , 改成了time.process_time()测量处理器运算时间,不包括sleep时间,不稳定,mac上测不出来
# print(time.altzone)  #返回与utc时间的时间差,以秒计算\
# print(time.asctime()) #返回时间格式"Fri Aug 19 11:14:16 2016",
# print(time.localtime()) #返回本地时间 的struct time对象格式
# print(time.gmtime(time.time()-800000)) #返回utc时间的struc时间对象格式

# print(time.asctime(time.localtime())) #返回时间格式"Fri Aug 19 11:14:16 2016",
#print(time.ctime()) #返回Fri Aug 19 12:38:29 2016 格式, 同上



# 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)



#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





#时间加减
import datetime

# print(datetime.datetime.now()) #返回 2016-08-19 12:47:03.941925
#print(datetime.date.fromtimestamp(time.time()) )  # 时间戳直接转成日期格式 2016-08-19
# print(datetime.datetime.now() )
# print(datetime.datetime.now() + datetime.timedelta(3)) #当前时间+3天
# print(datetime.datetime.now() + datetime.timedelta(-3)) #当前时间-3天
# print(datetime.datetime.now() + datetime.timedelta(hours=3)) #当前时间+3小时
# print(datetime.datetime.now() + datetime.timedelta(minutes=30)) #当前时间+30分


#
# c_time  = datetime.datetime.now()
# print(c_time.replace(minute=3,hour=2)) #时间替换

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.