Javascript对日期的操作
javascript对日期处理的常用方法类
<script language="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(){
var ar = (this + ",0,0,0").match(/\d+/g);
return ar[5]?(new Date(ar[0],ar[1]-1,ar[2],ar[3],ar[4],ar[5])):(new Date());
}
/**//*
* 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,true or false
* 返回:对应日期的中文字符串
*/
Date.prototype.toString = function(dateFmt,isFmtWithZero){
dateFmt = (dateFmt == null ? "yy-mm-dd hh:mi:ss" : dateFmt);
if(typeof(dateFmt) != "string" )
throw (new Error(-1, 'toString()方法的第一个参数为字符串类型!'));
isFmtWithZero = !!isFmtWithZero;
var weekArr=[["日","一","二","三","四","五","六"],["SUN","MON","TUR","WED","THU","FRI","SAT"]];
var monthArr=["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
var str=dateFmt;
var o = {
"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(var i in o){
str = str.replace(new RegExp(i,"g"),o[i].toString().fmtWithZero(isFmtWithZero));
}
str = str.replace(/ms/g,this.getMilliseconds().toString().fmtWithZeroD(isFmtWithZero));
return str;
}
/**//*将一位数字格式化成两位,如: 9 to 09*/
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 : num number类型 可以为正负整数或者浮点数,默认为1;
* type 0(秒) or 1(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") throw new Error(-1,"dateAfterDays(num,type)的num参数为数值类型.");
type = (type==null?1:type);
var arr = [1000,86400000];
return new Date(this.valueOf() + num*arr[type]);
}
//判断是否是闰年,返回true 或者 false
Date.prototype.isLeapYear = function (){
var year = this.getFullYear();
return (0==year%4 && ((year % 100 != 0)||(year % 400 == 0)));
}
//返回该月天数
Date.prototype.getDaysOfMonth = function (){
return (new Date(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)))
throw new Error(-1,"dateCompare(date)的date参数为Date类型.");
var d = this.getTime() - date.getTime();
return d>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)))
throw new Error(-1,"calDateDistance(date,type,intOrFloat)的date参数为Date类型.");
type = (type==null?'dd':type);
if(!((new RegExp(type+",","g")).test("yy,mm,ww,dd,hh,mi,ss,ms,")))
throw new Error(-1,"calDateDistance(pd,type,intOrFloat,output)的type参数为非法.");
var iof = (intOrFloat==null?0:intOrFloat);
var num=0;
var o = {
"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:
var sub = 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")
throw new Error(-1,"RtnByWeekNum(weekNum)的参数是数字类型.");
var date = new Date(this.getFullYear(),0,1);
var week = date.getDay();
week = (week==0?7:week);
return date.dateAfter(weekNum*7-week,1);
}
//根据日期返回该日期所在年的周数
Date.prototype.getWeekNum = function (){
var dat = new Date(this.getFullYear(),0,1);
var week = dat.getDay();
week = (week==0?7:week);
var days = this.calDateDistance(dat,"dd")+1;
return ((days + 6 - this.getDay() - 7 + week)/7);
}
//-->
</script>
<script language="JavaScript">
<!--
var dw = document.write;
var date2 = "2005-12-30".parseDate();
dw(date2,"<br>");
var date3 = "2006-1-10 11 11 11".parseDate();
dw(date2.calDateDistance(date3,null,null,"时间差为#天!"));
//alert(new Date(2000,2,-29));
//-->
</script>
<!--
//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(){
var ar = (this + ",0,0,0").match(/\d+/g);
return ar[5]?(new Date(ar[0],ar[1]-1,ar[2],ar[3],ar[4],ar[5])):(new Date());
}
/**//*
* 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,true or false
* 返回:对应日期的中文字符串
*/
Date.prototype.toString = function(dateFmt,isFmtWithZero){
dateFmt = (dateFmt == null ? "yy-mm-dd hh:mi:ss" : dateFmt);
if(typeof(dateFmt) != "string" )
throw (new Error(-1, 'toString()方法的第一个参数为字符串类型!'));
isFmtWithZero = !!isFmtWithZero;
var weekArr=[["日","一","二","三","四","五","六"],["SUN","MON","TUR","WED","THU","FRI","SAT"]];
var monthArr=["JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"];
var str=dateFmt;
var o = {
"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(var i in o){
str = str.replace(new RegExp(i,"g"),o[i].toString().fmtWithZero(isFmtWithZero));
}
str = str.replace(/ms/g,this.getMilliseconds().toString().fmtWithZeroD(isFmtWithZero));
return str;
}
/**//*将一位数字格式化成两位,如: 9 to 09*/
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 : num number类型 可以为正负整数或者浮点数,默认为1;
* type 0(秒) or 1(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") throw new Error(-1,"dateAfterDays(num,type)的num参数为数值类型.");
type = (type==null?1:type);
var arr = [1000,86400000];
return new Date(this.valueOf() + num*arr[type]);
}
//判断是否是闰年,返回true 或者 false
Date.prototype.isLeapYear = function (){
var year = this.getFullYear();
return (0==year%4 && ((year % 100 != 0)||(year % 400 == 0)));
}
//返回该月天数
Date.prototype.getDaysOfMonth = function (){
return (new Date(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)))
throw new Error(-1,"dateCompare(date)的date参数为Date类型.");
var d = this.getTime() - date.getTime();
return d>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)))
throw new Error(-1,"calDateDistance(date,type,intOrFloat)的date参数为Date类型.");
type = (type==null?'dd':type);
if(!((new RegExp(type+",","g")).test("yy,mm,ww,dd,hh,mi,ss,ms,")))
throw new Error(-1,"calDateDistance(pd,type,intOrFloat,output)的type参数为非法.");
var iof = (intOrFloat==null?0:intOrFloat);
var num=0;
var o = {
"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:
var sub = 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")
throw new Error(-1,"RtnByWeekNum(weekNum)的参数是数字类型.");
var date = new Date(this.getFullYear(),0,1);
var week = date.getDay();
week = (week==0?7:week);
return date.dateAfter(weekNum*7-week,1);
}
//根据日期返回该日期所在年的周数
Date.prototype.getWeekNum = function (){
var dat = new Date(this.getFullYear(),0,1);
var week = dat.getDay();
week = (week==0?7:week);
var days = this.calDateDistance(dat,"dd")+1;
return ((days + 6 - this.getDay() - 7 + week)/7);
}
//-->
</script>
<script language="JavaScript">
<!--
var dw = document.write;
var date2 = "2005-12-30".parseDate();
dw(date2,"<br>");
var date3 = "2006-1-10 11 11 11".parseDate();
dw(date2.calDateDistance(date3,null,null,"时间差为#天!"));
//alert(new Date(2000,2,-29));
//-->
</script>
