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()+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 = DateValue(''+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;           }