Js获取当前日期时间及格式化操作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()+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 = 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;  }   如果要实现这样的时钟：2012年12月03日 17:21:16 星期一//本地时钟function clockon() {    var now = new Date();    var year = now.getFullYear(); //getFullYear getYear    var month = now.getMonth();    var date = now.getDate();    var day = now.getDay();    var hour = now.getHours();    var minu = now.getMinutes();    var sec = now.getSeconds();    var week;    month = month + 1;    if (month < 10) month = "0" + month;    if (date < 10) date = "0" + date;    if (hour < 10) hour = "0" + hour;    if (minu < 10) minu = "0" + minu;    if (sec < 10) sec = "0" + sec;    var arr_week = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");    week = arr_week[day];    var time = "";    time = year + "年" + month + "月" + date + "日" + " " + hour + ":" + minu + ":" + sec + " " + week;    $("#bgclock").html(time);    var timer = setTimeout("clockon()", 200);}

/**     * 对Date的扩展，将 Date 转化为指定格式的String     * 月(M)、日(d)、12小时(h)、24小时(H)、分(m)、秒(s)、周(E)、季度(q) 可以用 1-2 个占位符     * 年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字)     * eg:     * (new Date()).pattern("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423     * (new Date()).pattern("yyyy-MM-dd E HH:mm:ss") ==> 2009-03-10 二 20:09:04     * (new Date()).pattern("yyyy-MM-dd EE hh:mm:ss") ==> 2009-03-10 周二 08:09:04     * (new Date()).pattern("yyyy-MM-dd EEE hh:mm:ss") ==> 2009-03-10 星期二 08:09:04     * (new Date()).pattern("yyyy-M-d h:m:s.S") ==> 2006-7-2 8:9:4.18     */     Date.prototype.pattern=function(fmt) {                var o = {                "M+" : this.getMonth()+1, //月份                "d+" : this.getDate(), //日                "h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12, //小时                "H+" : this.getHours(), //小时                "m+" : this.getMinutes(), //分                "s+" : this.getSeconds(), //秒                "q+" : Math.floor((this.getMonth()+3)/3), //季度                "S" : this.getMilliseconds() //毫秒                };                var week = {                "0" : "\u65e5",                "1" : "\u4e00",                "2" : "\u4e8c",                "3" : "\u4e09",                "4" : "\u56db",                "5" : "\u4e94",                "6" : "\u516d"             };                if(/(y+)/.test(fmt)){                        fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));                }                if(/(E+)/.test(fmt)){                        fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "\u661f\u671f" : "\u5468") : "")+week[this.getDay()+""]);                }                for(var k in o){                        if(new RegExp("("+ k +")").test(fmt)){                                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));                        }                }                return fmt;        }