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); 
 }