JS日期操作函數

    Date.prototype.Format 日期格式化

    Date.prototype.DateAdd 日期計算

    Date.prototype.DateDiff 比較日期差

    Date.prototype.toString 日期轉字符串

    Date.prototype.toArray 日期分割為數組

    Date.prototype.DatePart 取日期的部分信息

    Date.prototype.MaxDayOfDate 取日期所在月的最大天數

    Date.prototype.WeekNumOfYear 判斷日期所在年的第幾周

    StringToDate 字符串轉日期型

    IsValidDate 驗證日期有效性

    CheckDateTime 完整日期時間檢查

    daysBetween 日期天數差


js代碼：  


//---------------------------------------------------     
// 判斷閏年     
//---------------------------------------------------     
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 時間     
// mm/m 分鐘     
// 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;      
}      

//+---------------------------------------------------     
//| 求兩個時間的天數差 日期格式為 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);     
}     


//+---------------------------------------------------     
//| 日期計算     
//+---------------------------------------------------     
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());     
    }     
}     

//+---------------------------------------------------     
//| 比較日期差 dtEnd 格式為日期型或者 有效日期格式字符串     
//+---------------------------------------------------     
Date.prototype.DateDiff = function(strInterval, dtEnd) {      
    var dtStart = this;     
    if (typeof dtEnd == 'string' )//如果是字符串轉換為日期型     
    {      
        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();     
    }     
}     

//+---------------------------------------------------     
//| 日期輸出字符串，重載了系統的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;     
}     

//+---------------------------------------------------     
//| 日期合法性驗證     
//| 格式為：YYYY-MM-DD或YYYY/MM/DD     
//+---------------------------------------------------     
function IsValidDate(DateStr)      
{      
    var sDate=DateStr.replace(/(^\s+|\s+$)/g,''); //去兩邊空格;      
    if(sDate=='') return true;      
    //如果格式滿足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替換為''      
    //數據庫中，合法日期可以是:YYYY-MM/DD(2003-3/21),數據庫會自動轉換為YYYY-MM-DD格式      
    var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g,'');      
    if (s=='') //說明格式滿足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('錯誤的日期格式！格式為：YYYY-MM-DD或YYYY/MM/DD。注意閏年。');      
            return false;      
        }      
    }      
    else      
    {      
        //alert('錯誤的日期格式！格式為：YYYY-MM-DD或YYYY/MM/DD。注意閏年。');      
        return false;      
    }      
    return true;      
}      

//+---------------------------------------------------     
//| 日期時間檢查     
//| 格式為：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;      
}      

//+---------------------------------------------------     
//| 把日期分割成數組     
//+---------------------------------------------------     
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;     
}     

//+---------------------------------------------------     
//| 取得日期數據信息     
//| 參數 interval 表示數據類型     
//| y 年 m月 d日 w星期 ww周 h時 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()+1;break;     
        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;     
}     

//+---------------------------------------------------     
//| 取得當前日期所在月的最大天數     
//+---------------------------------------------------     
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;     
}     

//+---------------------------------------------------     
//| 取得當前日期所在周是一年中的第幾周     
//+---------------------------------------------------     
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 = DateValue(''+month+'-'+day+'-'+year+'') \n');     
    document.write('result = DatePart('ww', myDate) \n');     
    document.write(' \n');     
    return result;     
}     

//+---------------------------------------------------     
//| 字符串轉成日期類型      
//| 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;     
}     </pre><br />