python日期格式化操作

a = "2013-10-10 23:40:00"
#将其转换为时间数组
import time
timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")
#转换为时间戳:
timeStamp = int(time.mktime(timeArray))
timeStamp == 1381419600

timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")
otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray)

timeStamp = 1381419600
timeArray = time.localtime(timeStamp)
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)
otherStyletime == "2013-10-10 23:40:00"

import datetime
timeStamp = 1381419600
dateArray = datetime.datetime.utcfromtimestamp(timeStamp)
otherStyleTime = dateArray.strftime("%Y-%m-%d %H:%M:%S")
otherStyletime == "2013-10-10 23:40:00"

import time
#获得当前时间时间戳
now = int(time.time())  ->这是时间戳
#转换为其他日期格式,如:"%Y-%m-%d %H:%M:%S"
timeArray = time.localtime(timeStamp)
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

import datetime
#获得当前时间
now = datetime.datetime.now()  ->这是时间数组格式
#转换为指定的格式:
otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S")

import time
import datetime
#先获得时间数组格式的日期
threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3))
#转换为时间戳:
timeStamp = int(time.mktime(threeDayAgo.timetuple()))
#转换为其他字符串格式:
otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S")
注:timedelta()的参数有:days,hours,seconds,microseconds

timeStamp = 1381419600
#先转换为datetime
import datetime
import time
dateArray = datetime.datetime.utcfromtimestamp(timeStamp)
threeDayAgo = dateArray - datetime.timedelta(days = 3)
#参考5,可以转换为其他的任意格式了

>>> import datetime #导入日期时间模块
>>> today = datetime.date.today() #获得今天的日期
>>> print today #输出今天日期
2014-01-04 
>>> yesterday = today - datetime.timedelta(days=1) #用今天日期减掉时间差，参数为1天，获得昨天的日期
>>> print yesterday
2014-01-03 
>>> tomorrow = today + datetime.timedelta(days=1) #用今天日期加上时间差，参数为1天，获得明天的日期
>>> print tomorrow
2014-01-05 
>>>
>>> print "昨天:%s， 今天:%s， 明天：%s" % (yesterday, today, tomorrow) #字符串拼接在一起输出，这3天的日期


昨天:2014-01-03， 今天:2014-01-04， 明天：2014-01-05

#!/usr/bin/python
import time
print (time.strftime("%H:%M:%S"))
## 12 hour format ##
print (time.strftime("%I:%M:%S"))
#：输出
#18:11:30
#6：11:30

!/usr/bin/python
import time
## dd/mm/yyyy格式
print (time.strftime("%d/%m/%Y"))
#输出：
11/03/2014

#!/usr/bin/python
import datetime
i = datetime.datetime.now()
print ("当前的日期和时间是 %s" % i)
print ("ISO格式的日期和时间是 %s" % i.isoformat() )
print ("当前的年份是 %s" %i.year)
print ("当前的月份是 %s" %i.month)
print ("当前的日期是  %s" %i.day)
print ("dd/mm/yyyy 格式是  %s/%s/%s" % (i.day, i.month, i.year) )
print ("当前小时是 %s" %i.hour)
print ("当前分钟是 %s" %i.minute)
print ("当前秒是  %s" %i.second)

# -*- coding: utf-8 -*-
from datetime import datetime

time = "2017年4月2日"
# 将str中的汉字换掉
time = time.replace(r'年', '-').replace(r'月', '-').replace(r'日', '')
print(time) # 输出2017-4-2
print(type(time)) # <type 'str'>
restime = datetime.strptime(time, '%Y-%m-%d')
print(restime) # 输出结果：2017-04-02 00:00:00
print(type(restime))# <type 'datetime.datetime'>

import time
from dateutil import parser

time_string = time.ctime() # 'Thu Dec 22 10:35:25 2016'，这里可以是任意的时间格式
datetime_struct = parser.parse(time_string)
print type(datetime_struct) # <type 'datetime.datetime'>
print datetime_struct.strftime('%Y-%m-%d %H:%M:%S') # 2016-12-22 13:58:59