<html>
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=uft-8">
<script language="javascript">
function window_onload()
{
var LSTR_Date = "20090115"
//(日期表示只有这一种格式，不支持民国年)
var LSTR_AddDays =45
var LSTR_DateType = "YYYYMMDD"
alert(AddDate(LSTR_Date,LSTR_AddDays,LSTR_DateType))
}
function AddDate(LISTR_Date,LISTR_AddDays,LISTR_DateType)
{
var LSTR_YY=0
var LSTR_MM=0
var LSTR_DD=0
var LINT_FLAG=0
//检查日期格式为 "YYYYMMDD" 或
//"MMDDYYYY" 且长度为8码
if((LISTR_DateType!="YYYYMMDD") &&(LISTR_DateType!="MMDDYYYY") &&(LISTR_Date.length!=8))
return false
if(LISTR_DateType=="MMDDYYYY")
LISTR_Date=LISTR_Date.substr(4,4)+LISTR_Date.substr(0,4)
LSTR_YY=parseInt(LISTR_Date.substr(0,4),10)
LSTR_MM=parseInt(LISTR_Date.substr(4,2),10)
LSTR_DD=parseInt(LISTR_Date.substr(6,2),10)+parseInt(LISTR_AddDays,10)
while(LINT_FLAG==0)
{
switch (LSTR_MM)
{
case 2:
if ((LSTR_YY % 4) != 0)
{
if (LSTR_DD >28)
{
LSTR_DD -=28
LSTR_MM =3
}
else
{
LINT_FLAG=1
}
}
else
{
if (((LSTR_YY % 100) == 0) &&((LSTR_YY % 400) != 0))
{
if (LSTR_DD >28)
{
LSTR_DD -=28
LSTR_MM =3
}
else
{
LINT_FLAG=1
}
}
else
{
if (LSTR_DD >29)
{
LSTR_DD -=29
LSTR_MM =3
}
else
{
LINT_FLAG=1
}
}
}
break
case 4:
case 6:
case 9:
case 11:
if (LSTR_DD >30)
{
LSTR_DD -=30
LSTR_MM +=1
}
else{LINT_FLAG=1}
break
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
if (LSTR_DD >31)
{
LSTR_DD -=31
LSTR_MM +=1
}
else
{
LINT_FLAG=1
}
break
case 12:
if (LSTR_DD >31)
{
LSTR_DD -=31
LSTR_MM=1
LSTR_YY +=1
}
else
{
LINT_FLAG=1
}
break
default:
return
break
}
}
if (LSTR_MM<10)
{
LSTR_MM="0" +LSTR_MM
}
if (LSTR_DD<10)
{
LSTR_DD="0" +LSTR_DD
}
if(LISTR_DateType=="MMDDYYYY")
return LSTR_MM+""+LSTR_DD+""+LSTR_YY+""
else
return LSTR_YY+""+LSTR_MM+""+LSTR_DD+""
}
</script>
</head>
<body onload="window_onload()">
</body>
</html>
var myDate = new Date()
myDate.getYear() //获取当前年份(2位)
myDate.getFullYear() //获取完整的年份(4位,1970-????)
myDate.getMonth() //获取当前月份(0-11,0代表1月)
myDate.getDate() //获取当前日(1-31)
myDate.getDay() //获取当前星期X(0-6,0代表星期天)
myDate.getTime() //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours() //获取当前小时数(0-23)
myDate.getMinutes() //获取当前分钟数(0-59)
myDate.getSeconds() //获取当前秒数(0-59)
myDate.getMilliseconds() //获取当前毫秒数(0-999)
myDate.toLocaleDateString() //获取当前日期
var mytime=myDate.toLocaleTimeString() //获取当前时间
myDate.toLocaleString( ) //获取日期与时间
日期时间脚本库方法列表
Date.prototype.isLeapYear 判断闰年
Date.prototype.Format 日期格式化
Date.prototype.DateAdd 日期计算
Date.prototype.DateDiff 比较日期差
Date.prototype.toString 日期转字符串
Date.prototype.toArray 日期分割为数组
Date.prototype.DatePart 取日期的部分信息
Date.prototype.MaxDayOfDate 取日期所在月的最大天数
Date.prototype.WeekNumOfYear 判断日期所在年的第几周
StringToDate 字符串转日期型
IsValidDate 验证日期有效性
CheckDateTime 完整日期时间检查
daysBetween 日期天数差
js代码：
//---------------------------------------------------
// 判断闰年
//---------------------------------------------------
Date.prototype.isLeapYear = function()
{
return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0)))
}
//---------------------------------------------------
// 日期格式化
// 格式 YYYY/yyyy/YY/yy 表示年份
// MM/M 月份
// W/w 星期
// dd/DD/d/D 日期
// hh/HH/h/H 时间
// mm/m 分钟
// ss/SS/s/S 秒
//---------------------------------------------------
Date.prototype.Format = function(formatStr)
{
var str = formatStr
var Week = ['日','一','二','三','四','五','六']
str=str.replace(/yyyy|YYYY/,this.getFullYear())
str=str.replace(/yy|YY/,(this.getYear() % 100)>9?(this.getYear() % 100).toString():'0' + (this.getYear() % 100))
str=str.replace(/MM/,this.getMonth()>9?this.getMonth().toString():'0' + this.getMonth())
str=str.replace(/M/g,this.getMonth())
str=str.replace(/w|W/g,Week[this.getDay()])
str=str.replace(/dd|DD/,this.getDate()>9?this.getDate().toString():'0' + this.getDate())
str=str.replace(/d|D/g,this.getDate())
str=str.replace(/hh|HH/,this.getHours()>9?this.getHours().toString():'0' + this.getHours())
str=str.replace(/h|H/g,this.getHours())
str=str.replace(/mm/,this.getMinutes()>9?this.getMinutes().toString():'0' + this.getMinutes())
str=str.replace(/m/g,this.getMinutes())
str=str.replace(/ss|SS/,this.getSeconds()>9?this.getSeconds().toString():'0' + this.getSeconds())
str=str.replace(/s|S/g,this.getSeconds())
return str
}
//+---------------------------------------------------
//| 求两个时间的天数差 日期格式为 YYYY-MM-dd
//+---------------------------------------------------
function daysBetween(DateOne,DateTwo)
{
var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'))
var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1)
var OneYear = DateOne.substring(0,DateOne.indexOf ('-'))
var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'))
var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1)
var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'))
var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000)
return Math.abs(cha)
}
//+---------------------------------------------------
//| 日期计算
//+---------------------------------------------------
Date.prototype.DateAdd = function(strInterval, Number) {
var dtTmp = this
switch (strInterval) {
case 's' :return new Date(Date.parse(dtTmp) + (1000 * Number))
case 'n' :return new Date(Date.parse(dtTmp) + (60000 * Number))
case 'h' :return new Date(Date.parse(dtTmp) + (3600000 * Number))
case 'd' :return new Date(Date.parse(dtTmp) + (86400000 * Number))
case 'w' :return new Date(Date.parse(dtTmp) + ((86400000 * 7) * Number))
case 'q' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number*3, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds())
case 'm' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + Number, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds())
case 'y' :return new Date((dtTmp.getFullYear() + Number), dtTmp.getMonth(), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds())
}
}
//+---------------------------------------------------
//| 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串
//+---------------------------------------------------
Date.prototype.DateDiff = function(strInterval, dtEnd) {
var dtStart = this
if (typeof dtEnd == 'string' )//如果是字符串转换为日期型
{
dtEnd = StringToDate(dtEnd)
}
switch (strInterval) {
case 's' :return parseInt((dtEnd - dtStart) / 1000)
case 'n' :return parseInt((dtEnd - dtStart) / 60000)
case 'h' :return parseInt((dtEnd - dtStart) / 3600000)
case 'd' :return parseInt((dtEnd - dtStart) / 86400000)
case 'w' :return parseInt((dtEnd - dtStart) / (86400000 * 7))
case 'm' :return (dtEnd.getMonth()+1)+((dtEnd.getFullYear()-dtStart.getFullYear())*12) - (dtStart.getMonth()+1)
case 'y' :return dtEnd.getFullYear() - dtStart.getFullYear()
}
}
//+---------------------------------------------------
//| 日期输出字符串，重载了系统的toString方法
//+---------------------------------------------------
Date.prototype.toString = function(showWeek)
{
var myDate= this
var str = myDate.toLocaleDateString()
if (showWeek)
{
var Week = ['日','一','二','三','四','五','六']
str += ' 星期' + Week[myDate.getDay()]
}
return str
}
//+---------------------------------------------------
//| 日期合法性验证
//| 格式为：YYYY-MM-DD或YYYY/MM/DD
//+---------------------------------------------------
function IsValidDate(DateStr)
{
var sDate=DateStr.replace(/(^\s+|\s+$)/g,'') //去两边空格
if(sDate=='') return true
//如果格式满足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替换为''
//数据库中，合法日期可以是:YYYY-MM/DD(2003-3/21),数据库会自动转换为YYYY-MM-DD格式
var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g,'')
if (s=='') //说明格式满足YYYY-MM-DD或YYYY-M-DD或YYYY-M-D或YYYY-MM-D
{
var t=new Date(sDate.replace(/\-/g,'/'))
var ar = sDate.split(/[-/:]/)
if(ar[0] != t.getYear() || ar[1] != t.getMonth()+1 || ar[2] != t.getDate())
{
//alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。')
return false
}
}
else
{
//alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。')
return false
}
return true
}
//+---------------------------------------------------
//| 日期时间检查
//| 格式为：YYYY-MM-DD HH:MM:SS
//+---------------------------------------------------
function CheckDateTime(str)
{
var reg = /^(\d+)-(\d{ 1,2 })-(\d{ 1,2 }) (\d{ 1,2 }):(\d{ 1,2 }):(\d{ 1,2 })$/
var r = str.match(reg)
if(r==null)return false
r[2]=r[2]-1
var d= new Date(r[1],r[2],r[3],r[4],r[5],r[6])
if(d.getFullYear()!=r[1])return false
if(d.getMonth()!=r[2])return false
if(d.getDate()!=r[3])return false
if(d.getHours()!=r[4])return false
if(d.getMinutes()!=r[5])return false
if(d.getSeconds()!=r[6])return false
return true
}
//+---------------------------------------------------
//| 把日期分割成数组
//+---------------------------------------------------
Date.prototype.toArray = function()
{
var myDate = this
var myArray = Array()
myArray[0] = myDate.getFullYear()
myArray[1] = myDate.getMonth()
myArray[2] = myDate.getDate()
myArray[3] = myDate.getHours()
myArray[4] = myDate.getMinutes()
myArray[5] = myDate.getSeconds()
return myArray
}
//+---------------------------------------------------
//| 取得日期数据信息
//| 参数 interval 表示数据类型
//| y 年 m月 d日 w星期 ww周 h时 n分 s秒
//+---------------------------------------------------
Date.prototype.DatePart = function(interval)
{
var myDate = this
var partStr=''
var Week = ['日','一','二','三','四','五','六']
switch (interval)
{
case 'y' :partStr = myDate.getFullYear()break
case 'm' :partStr = myDate.getMonth()+1break
case 'd' :partStr = myDate.getDate()break
case 'w' :partStr = Week[myDate.getDay()]break
case 'ww' :partStr = myDate.WeekNumOfYear()break
case 'h' :partStr = myDate.getHours()break
case 'n' :partStr = myDate.getMinutes()break
case 's' :partStr = myDate.getSeconds()break
}
return partStr
}
//+---------------------------------------------------
//| 取得当前日期所在月的最大天数
//+---------------------------------------------------
Date.prototype.MaxDayOfDate = function()
{
var myDate = this
var ary = myDate.toArray()
var date1 = (new Date(ary[0],ary[1]+1,1))
var date2 = date1.dateAdd(1,'m',1)
var result = dateDiff(date1.Format('yyyy-MM-dd'),date2.Format('yyyy-MM-dd'))
return result
}
//+---------------------------------------------------
//| 取得当前日期所在周是一年中的第几周
//+---------------------------------------------------
Date.prototype.WeekNumOfYear = function()
{
var myDate = this
var ary = myDate.toArray()
var year = ary[0]
var month = ary[1]+1
var day = ary[2]
document.write('< script language=VBScript\> \n')
document.write('myDate = Datue(''+month+'-'+day+'-'+year+'') \n')
document.write('result = DatePart('ww', myDate) \n')
document.write(' \n')
return result
}
//+---------------------------------------------------
//| 字符串转成日期类型
//| 格式 MM/dd/YYYY MM-dd-YYYY YYYY/MM/dd YYYY-MM-dd
//+---------------------------------------------------
function StringToDate(DateStr)
{
var converted = Date.parse(DateStr)
var myDate = new Date(converted)
if (isNaN(myDate))
{
//var delimCahar = DateStr.indexOf('/')!=-1?'/':'-'
var arys= DateStr.split('-')
myDate = new Date(arys[0],--arys[1],arys[2])
}
return myDate
}
若要显示:当前日期加时间(如:2009-06-12 12:00)
function CurentTime()
{
var now = new Date()
var year = now.getFullYear() //年
var month = now.getMonth() + 1 //月
var day = now.getDate() //日
var hh = now.getHours() //时
var mm = now.getMinutes() //分
var clock = year + "-"
if(month < 10)
clock += "0"
clock += month + "-"
if(day < 10)
clock += "0"
clock += day + " "
if(hh < 10)
clock += "0"
clock += hh + ":"
if (mm < 10) clock += '0'
clock += mm
return(clock)
}
这是我博客里的一篇文章。上边有清晰的思路。你自己改改。
public static void main(String[] args) {// Date date=new Date()
Calendar cal=Calendar.getInstance()
cal.set(Calendar.HOUR,12)
cal.set(Calendar.MINUTE, 0)
cal.set(Calendar.SECOND,0)
Calendar cal2=Calendar.getInstance()
cal2.set(Calendar.HOUR, 14)
cal2.set(Calendar.MINUTE,0)
cal.set(Calendar.SECOND,0)
System.out.println(cal.getTimeInMillis())
System.out.println(cal2.getTimeInMillis())
long time=cal.getTimeInMillis()-cal2.getTimeInMillis()
Date d=new Date(time)
System.out.println(d)
SimpleDateFormat sf=new SimpleDateFormat("HH:mm:ss")
String strtime=sf.format(d)
System.out.println(strtime)
}
