js日期相关函数dateAdd,dateDiff,dateFormat等介绍

//--------------------------------------------------- // 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; }  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);  }