Javascript对日期的操作


javascript对日期处理的常用方法类

<scriptlanguage="JavaScript">
<!--
//程序:常用公历日期处理程序
/**//*用相对不规则的字符串来创建日期对象,不规则的含义为:顺序包含年月日三个数值串,有间隔*/
String.prototype.parseDate=function(){
  varar=(this+",0,0,0").match(/d+/g);
  returnar[5]?(newDate(ar[0],ar[1]-1,ar[2],ar[3],ar[4],ar[5])):(newDate());
}
/**//*
*功能:根据输入表达式返回日期字符串
*参数:dateFmt:字符串,由以下结构组成  
*   yy:长写年,YY:短写年mm:数字月,MM:英文月,dd:日,hh:时,
*   mi:分,ss秒,ms:毫秒,we:汉字星期,WE:英文星期.
*   isFmtWithZero:是否用0进行格式化,trueorfalse
*返回:对应日期的中文字符串
*/
Date.prototype.toString=function(dateFmt,isFmtWithZero){
  dateFmt=(dateFmt==null?"yy-mm-ddhh:mi:ss":dateFmt);
  if(typeof(dateFmt)!="string")
    throw(newError(-1,'toString()方法的第一个参数为字符串类型!'));
  isFmtWithZero=!!isFmtWithZero;
  varweekArr=[["日","一","二","三","四","五","六"],["SUN","MON","TUR","WED","THU","FRI","SAT"]];
  varmonthArr=["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
  varstr=dateFmt;
  varo={
    "yy":this.getFullYear(),
    "YY":this.getYear(),
    "mm":this.getMonth()+1,
    "MM":monthArr[this.getMonth()],
    "dd":this.getDate(),
    "hh":this.getHours(),
    "mi":this.getMinutes(),
    "ss":this.getSeconds(),
    "we":"星期"+weekArr[0][this.getDay()],
    "WE":weekArr[1][this.getDay()]
  }
  for(variino){
    str=str.replace(newRegExp(i,"g"),o[i].toString().fmtWithZero(isFmtWithZero));
  }
  str=str.replace(/ms/g,this.getMilliseconds().toString().fmtWithZeroD(isFmtWithZero));
  returnstr;
}
/**//*将一位数字格式化成两位,如:9to09*/
String.prototype.fmtWithZero=function(isFmtWithZero){  
  return(isFmtWithZero&&/^d$/.test(this))?"0"+this:this;
}
String.prototype.fmtWithZeroD=function(isFmtWithZero){  
  return(isFmtWithZero&&/^d{2}$/.test(this))?"00"+this:((isFmtWithZero&&/^d$/.test(this))?"0"+this:this);
}
/**//*功能:返回与某日期相距N天(N个24小时)的日期
*参数:numnumber类型可以为正负整数或者浮点数,默认为1;
*    type0(秒)or1(天),默认为天
*返回:新的Date对象
*/
Date.prototype.dateAfter=function(num,type){
  num=(num==null?1:num);
  if(typeof(num)!="number")thrownewError(-1,"dateAfterDays(num,type)的num参数为数值类型.");
  type=(type==null?1:type);
  vararr=[1000,86400000];
  returnnewDate(this.valueOf()+num*arr[type]);
}
//判断是否是闰年,返回true或者false
Date.prototype.isLeapYear=function(){
  varyear=this.getFullYear();
  return(0==year%4&&((year%100!=0)||(year%400==0)));
}
//返回该月天数
Date.prototype.getDaysOfMonth=function(){
  return(newDate(this.getFullYear(),this.getMonth()+1,0)).getDate();
}
//日期比较函数,参数date:为Date类型,如this日期晚于参数:1,相等:0早于:-1
Date.prototype.dateCompare=function(date){
  if(typeof(date)!="object"||!(/Date/.test(date.constructor)))
    thrownewError(-1,"dateCompare(date)的date参数为Date类型.");
  vard=this.getTime()-date.getTime();
  returnd>0?1:(d==0?0:-1);
}
/**//*功能:返回两日期之差
*参数:pd PowerDate对象
*  type:返回类别标识.yy:年,mm:月,ww:周,dd:日,hh:小时,mi:分,ss:秒,ms:毫秒
*  intOrFloat:返回整型还是浮点型值0:整型,不等于0:浮点型
*  output:输出提示,如:时间差为#周!
*/
Date.prototype.calDateDistance=function(date,type,intOrFloat,output){
  if(typeof(date)!="object"||!(/Date/.test(date.constructor)))
    thrownewError(-1,"calDateDistance(date,type,intOrFloat)的date参数为Date类型.");
  type=(type==null?'dd':type);
  if(!((newRegExp(type+",","g")).test("yy,mm,ww,dd,hh,mi,ss,ms,")))
    thrownewError(-1,"calDateDistance(pd,type,intOrFloat,output)的type参数为非法.");
  variof=(intOrFloat==null?0:intOrFloat);
  varnum=0;
  varo={
    "ww":7*86400000,
    "dd":86400000,
    "hh":3600000,
    "mi":60000,
    "ss":1000,
    "ms":1
  }
  switch(type){
    case"yy":num=this.getFullYear()-date.getFullYear();break;
    case"mm":num=(this.getFullYear()-date.getFullYear())*12+this.getMonth()-date.getMonth();break;
    default:
      varsub=this.valueOf()-date.valueOf();
      if(o[type])
        num=(sub/o[type]).fmtRtnVal(iof);
      break;
  }
  return(output?output.replace(/#/g,""+num+""):num);
}
//返回整数或者两位小数的浮点数
Number.prototype.fmtRtnVal=function(intOrFloat){
  return(intOrFloat==0?Math.floor(this):parseInt(this*100)/100);
}
//根据当前日期所在年和周数返回周日的日期
Date.prototype.RtnByWeekNum=function(weekNum){
  if(typeof(weekNum)!="number")
    thrownewError(-1,"RtnByWeekNum(weekNum)的参数是数字类型.");
  vardate=newDate(this.getFullYear(),0,1);
  varweek=date.getDay();
  week=(week==0?7:week);
  returndate.dateAfter(weekNum*7-week,1);
}
//根据日期返回该日期所在年的周数
Date.prototype.getWeekNum=function(){
  vardat=newDate(this.getFullYear(),0,1);
  varweek=dat.getDay();
  week=(week==0?7:week);
  vardays=this.calDateDistance(dat,"dd")+1;
  return((days+6-this.getDay()-7+week)/7);
}
//-->
</script>
<scriptlanguage="JavaScript">
<!--
vardw=document.write;
vardate2="2005-12-30".parseDate();
dw(date2,"<br>");
vardate3="2006-1-10111111".parseDate();
dw(date2.calDateDistance(date3,null,null,"时间差为#天!"));
//alert(newDate(2000,2,-29));
//-->
</script>


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