js time function application addition, subtraction, comparison, format conversion sample code_javascript skills

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// JavaScript Document
//---------------------------------- ----------------
// Determining leap years
//------------------------ -----------------------------
Date.prototype.isLeapYear = function() {
return (0== this.getYear()%4&&((this.getYear() 0!=0)||(this.getYear()@0==0)));
}

//- --------------------------------------------------
// Date formatting
// Format YYYY/yyyy/YY/yy represents year
// MM/M month
// W/w week
// dd/DD/ d/D Date
// hh/HH/h/H Time
// mm/m Minutes
// ss/SS/s/S Seconds
//------ ---------------------------------------------
// Extension of Date, convert Date into String in the specified format
// month (M), day (d), hour (h), minute (m), second (s), quarter (q) can use 1 -2 placeholders,
// Year (y) can use 1-4 placeholders, milliseconds (S) can only use 1 placeholder (a number with 1-3 digits)
// Example:
// (new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423
// (new Date()).Format("yyyy-M-d h:m:s.S") ==> 2006-7-2 8:9:4.18
Date.prototype.Format = function(fmt)
{ //author: meizz
var o = {
"M " : this.getMonth() 1, //Month
"d " : this.getDate(), //Day
"h " : this.getHours(), //Hours
"H " : this.getHours(), //Hours
"m " : this.getMinutes(), //Minutes
" s " : this.getSeconds(), //Seconds
"q " : Math.floor((this.getMonth() 3)/3), //Quarter
"S" : this.getMilliseconds() //Milliseconds
};
if(/(y )/.test(fmt))
fmt=fmt.replace(RegExp.$1, (this.getFullYear() "").substr(4 - RegExp.$1.length));
for(var k in o)
if(new RegExp("(" k ")").test(fmt))
fmt = fmt.replace( RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00" o[k]).substr(("" o[k]).length)));
return fmt;
}

/**
* Extension of Date, convert Date into String in specified format
* Month (M), day (d), 12 hours (h), 24 hours (H), minutes (m), seconds ( s), week (E), quarter (q) can use 1-2 placeholders
* year (y) can use 1-4 placeholders, milliseconds (S) can only use 1 placeholder symbol (is a number of 1-3 digits)
* eg:
* (new Date()).pattern("yyyy-MM-dd hh:mm:ss.S") ==> 2006- 07-02 08:09:04.423
* (new Date()).pattern("yyyy-MM-dd E HH:mm:ss") ==> 2009-03-10 Tuesday 20:09:04
* (new Date()).pattern("yyyy-MM-dd EE hh:mm:ss") ==> 2009-03-10 Tuesday 08:09:04
* (new Date( )).pattern("yyyy-MM-dd EEE hh:mm:ss") ==> 2009-03-10 Tuesday 08:09:04
* (new Date()).pattern("yyyy- M-d h:m:s.S") ==> 2006-7-2 8:9:4.18
*/
Date.prototype.pattern=function(fmt) {
var o = {
"M " : this.getMonth() 1, //Month
"d " : this.getDate(), //Day
"h " : this.getHours() == 0 ? 12 : this.getHours( ), //hours
"H " : this.getHours(), //hours
"m " : this.getMinutes(), //minutes
"s " : this.getSeconds() , //Seconds
"q " : Math.floor((this.getMonth() 3)/3), //Quarter
"S" : this.getMilliseconds() //Milliseconds
};
var week = {
"0" : "/u65e5",
"1" : "/u4e00",
"2" : "/u4e8c",
"3" : "/u4e09",
"4" : "/u56db",
"5" : "/u4e94",
"6" : "/u516d"
};
if( /(y )/.test(fmt)){
fmt=fmt.replace(RegExp.$1, (this.getFullYear() "").substr(4 - RegExp.$1.length));
}
if(/(E )/.test(fmt)){
fmt=fmt.replace(RegExp.$1, ((RegExp.$1.length>1) ? (RegExp.$1.length>2 ? "/u661f/u671f" : "/u5468") : "") week[this.getDay() ""]);
}
for(var k in o){
if(new RegExp("(" k ")").test(fmt)){
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (( "00" o[k]).substr(("" o[k]).length)));
}
}
return fmt;
}

/ /------------------------------------------------- --
//| Find the difference in days between two times. The date format is 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(dtTmp.getFullYear(), (dtTmp.getMonth()), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds() Number); //秒
case 'n' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes() Number, dtTmp.getSeconds()); //分
case 'h' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()), dtTmp.getDate(), dtTmp.getHours() Number, dtTmp.getMinutes(), dtTmp.getSeconds()); //时
case 'd' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()), dtTmp.getDate() Number, dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds()); //天
case 'w' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()), dtTmp.getDate() Number*7, dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds()); //周
case 'q' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) Number*3, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds());//季度
case 'm' :return new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) Number, dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds()); //月
case 'y' :return new Date((dtTmp.getFullYear() Number), dtTmp.getMonth(), dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp.getSeconds()); //年
}
}

// ---------------------------------------------------
//| 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;
}

// ------------------ --------------------------------
//| Date and time check
//| The format is: 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;
}

//------------------------------------------------ ------
//| Split the date into arrays
// ---------------------------- -----------------------
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;
}

// ------------------------------------------ ----------
//| Get date data information
//| The parameter interval represents the data type
//| y year m month d day w week ww week h hour n Minutes s seconds
//--------------------------------------------- ---------
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;
}

// ---------------------------------------- ----------
//| Get the maximum number of days in the month of the current date
// -------------------- -------------------------------
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;
}

// ---------------------------------------- ---------------
//| Convert string to date type
//| Format 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;
}

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