#-*- coding: utf-8 -*-

import datetime

#给定日期向后N天的日期

def dateadd_day(days):

d1 = datetime.datetime.now()

d3 = d1 + datetime.timedelta(days)

return d3

#昨天

def getYesterday():

today = datetime.date.today()

oneday = datetime.timedelta(days=1)

yesterday = today - oneday

return yesterday

#今天

def getToday():

return datetime.date.today()

#获取给定参数的前几天的日期，返回一个list

def getDaysBefore(num):

today = datetime.date.today()

oneday = datetime.timedelta(days=1)

li = []

for i in range(0, num):

#今天减一天，一天一天减

today = today - oneday

#把日期转换成字符串

li.append(datetostr(today))

return li

#将字符串转换成datetime类型

def strtodatetime(datestr, format):

return datetime.datetime.strptime(datestr, format)

#时间转换成字符串,格式为2015-02-02

def datetostr(date):

return str(date)[0:10]

#时间转换成字符串,格式为2015-02-02

def datetostr_secod(date):

return str(date)[0:19]

#两个日期相隔多少天，例：2015-2-04和2015-3-1

def datediff(beginDate, endDate):

format = "%Y-%m-%d"

bd = strtodatetime(beginDate, format)

ed = strtodatetime(endDate, format)

oneday = datetime.timedelta(days=1)

count = 0

while bd != ed:

ed = ed - oneday

count += 1

return count

#两个日期之间相差的秒

def datediff_seconds(beginDate, endDate):

format = "%Y-%m-%d %H:%M:%S"

if " " not in beginDate or ':' not in beginDate:

bformat = "%Y-%m-%d"

else:

bformat = format

if " " not in endDate or ':' not in endDate:

eformat = "%Y-%m-%d"

else:

eformat = format

starttime = strtodatetime(beginDate, bformat)

endtime = strtodatetime(endDate, eformat)

ret = endtime - starttime

return ret.days * 86400 + ret.seconds

#获取两个时间段的所有时间,返回list

def getDays(beginDate, endDate):

format = "%Y-%m-%d"

begin = strtodatetime(beginDate, format)

oneday = datetime.timedelta(days=1)

num = datediff(beginDate, endDate) + 1

li = []

for i in range(0, num):

li.append(datetostr(begin))

begin = begin + oneday

return li

#获取当前年份 是一个字符串

def getYear(date=datetime.date.today()):

return str(date)[0:4]

#获取当前月份 是一个字符串

def getMonth(date=datetime.date.today()):

return str(date)[5:7]

#获取当前天 是一个字符串

def getDay(date=datetime.date.today()):

return str(date)[8:10]

#获取当前小时 是一个字符串

def getHour(date=datetime.datetime.now()):

return str(date)[11:13]

#获取当前分钟 是一个字符串

def getMinute(date=datetime.datetime.now()):

return str(date)[14:16]

#获取当前秒 是一个字符串

def getSecond(date=datetime.datetime.now()):

return str(date)[17:19]

def getNow():

return datetime.datetime.now()

print dateadd_day(10)

#2015-02-14 16:41:13.275000

print getYesterday()

#2015-02-03

print getToday()

#2015-02-04

print getDaysBefore(3)

#['2015-02-03', '2015-02-02', '2015-02-01']

print datediff('2015-2-01', '2015-10-05')

#246

print datediff_seconds('2015-02-04', '2015-02-05')

#86400

print datediff_seconds('2015-02-04 22:00:00', '2015-02-05')

#7200

print getDays('2015-2-03', '2015-2-05')

#['2015-02-03', '2015-02-04', '2015-02-05']

print datetostr_secod(getNow())

#2015-02-04 16:46:47

print str(getYear(dateadd_day(-50))) + '-'\

+ getMonth() + '-'\

+ getDay() + ' '\

+ getHour() + ':'\

+ getMinute() + ':'\

+ getSecond()

#2014-02-04 16:59:04

print getNow()

#2015-02-04 16:46:47.454000