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

Js获取当前日期时间及其它操作

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：

当然都是后期增加的一些功能大家可以根据需要选择

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