#-*- 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 - onedayreturn 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 = 0while bd != ed:ed = ed - onedaycount += 1return 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 = formatif " " not in endDate or ':' not in endDate:eformat = "%Y-%m-%d"else:eformat = formatstarttime = strtodatetime(beginDate, bformat)endtime = strtodatetime(endDate, eformat)ret = endtime - starttimereturn 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) + 1li = []for i in range(0, num):li.append(datetostr(begin))begin = begin + onedayreturn 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 16:41:13.275000print getYesterday()
#2015-02-03print getToday()
#2015-02-04print getDaysBefore(3)
#['2015-02-03', '2015-02-02', '2015-02-01']print datediff('2015-2-01', '2015-10-05')
#246print datediff_seconds('2015-02-04', '2015-02-05')
#86400print datediff_seconds('2015-02-04 22:00:00', '2015-02-05')
#7200print getDays('2015-2-03', '2015-2-05')
#['2015-02-03', '2015-02-04', '2015-02-05']print datetostr_secod(getNow())
#2015-02-04 16:46:47print str(getYear(dateadd_day(-50))) + '-'\+ getMonth() + '-'\+ getDay() + ' '\+ getHour() + ':'\+ getMinute() + ':'\+ getSecond()
#2014-02-04 16:59:04print getNow()
#2015-02-04 16:46:47.454000