python常用的日期时间处理方法示例

#-*- 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

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