常用的日期和时间操作方法代码,Python代码库,德仔网

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【Python】常用的日期和时间操作方法
作者:佳凌 / 发布于2015/6/16/ 908

	#-*- 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()
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