js操作日期（函数，js版的dateAdd与dateDiff，四舍五入(round()方法)并保留小数点后N位的函数）

JS操作时间(函数)

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：//--------------------------------------------------- // 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 = DateValue(''+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; }

js版的dateAdd与dateDiff

/* 得到日期年月日等加数字后的日期 */ Date.prototype.dateAdd = function(interval,number) { var d = this; var k={'y':'FullYear', 'q':'Month', 'm':'Month', 'w':'Date', 'd':'Date', 'h':'Hours', 'n':'Minutes', 's':'Seconds', 'ms':'MilliSeconds'}; var n={'q':3, 'w':7}; eval('d.set'+k[interval]+'(d.get'+k[interval]+'()+'+((n[interval]||1)*number)+')'); return d; } /* 计算两日期相差的日期年月日等 */ Date.prototype.dateDiff = function(interval,objDate2) { var d=this, i={}, t=d.getTime(), t2=objDate2.getTime(); i['y']=objDate2.getFullYear()-d.getFullYear(); i['q']=i['y']*4+Math.floor(objDate2.getMonth()/4)-Math.floor(d.getMonth()/4); i['m']=i['y']*12+objDate2.getMonth()-d.getMonth(); i['ms']=objDate2.getTime()-d.getTime(); i['w']=Math.floor((t2+345600000)/(604800000))-Math.floor((t+345600000)/(604800000)); i['d']=Math.floor(t2/86400000)-Math.floor(t/86400000); i['h']=Math.floor(t2/3600000)-Math.floor(t/3600000); i['n']=Math.floor(t2/60000)-Math.floor(t/60000); i['s']=Math.floor(t2/1000)-Math.floor(t/1000); return i[interval]; }

 

dateAdd 方法

返回已添加指定时间间隔的日期对象。

dateObj.dateAdd(interval, number)

参数

dateObj

    必选项。任意 Date 对象。

interval

    必选项。字符串表达式，表示要添加的时间间隔。有关数值，请参阅“设置”部分。

number

    必选项。数值表达式，表示要添加的时间间隔的个数。数值表达式可以是正数（得到未来的日期）或负数（得到过去的日期）。

dateDiff 方法

返回两个日期对象之间的时间间隔。

dateObj.dateDiff(interval, dateObj2)

参数

interval

    必选项。字符串表达式，表示用于计算 date1 和 date2 之间的时间间隔。有关数值，请参阅“设置”部分。

dateObj, dateObj2

    必选项。日期对象。用于计算的两个日期对象。

设置

interval 参数可以有以下值：

设置描述y年q季度m月d日w周h小时n分钟s秒ms毫秒

 

js获取日期星期

<mce:script language=javascript><!--//今天function showToDay(){var Nowdate=new Date();M=Number(Nowdate.getMonth())+1return Nowdate.getYear()+"-"+M+"-"+Nowdate.getDate();}//本周第一天function showWeekFirstDay(){var Nowdate=new Date();var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);return WeekFirstDay;}//本周最后一天function showWeekLastDay(){var Nowdate=new Date();var WeekFirstDay=new Date(Nowdate-(Nowdate.getDay()-1)*86400000);var WeekLastDay=new Date((WeekFirstDay/1000+6*86400)*1000);return WeekLastDay;}//本月第一天function showMonthFirstDay(){var Nowdate=new Date();var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1);return MonthFirstDay;}//本月最后一天function showMonthLastDay(){var Nowdate=new Date();var MonthNextFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1);var MonthLastDay=new Date(MonthNextFirstDay-86400000);return MonthLastDay;}//上月第一天function showPreviousFirstDay(){var MonthFirstDay=showMonthFirstDay()return new Date(MonthFirstDay.getYear(),MonthFirstDay.getMonth()-1,1)}//上月最后一天function showPreviousLastDay(){var MonthFirstDay=showMonthFirstDay();return new Date(MonthFirstDay-86400000);}//上周第一天function showPreviousFirstWeekDay(){var WeekFirstDay=showWeekFirstDay()return new Date(WeekFirstDay-86400000*7)}//上周最后一天function showPreviousLastWeekDay(){var WeekFirstDay=showWeekFirstDay()return new Date(WeekFirstDay-86400000)}//上一天function showPreviousDay(){var MonthFirstDay=new Date();return new Date(MonthFirstDay-86400000);}//下一天function showNextDay(){var MonthFirstDay=new Date();return new Date((MonthFirstDay/1000+86400)*1000);}//下周第一天function showNextFirstWeekDay(){var MonthFirstDay=showWeekLastDay()return new Date((MonthFirstDay/1000+86400)*1000)}//下周最后一天function showNextLastWeekDay(){var MonthFirstDay=showWeekLastDay()return new Date((MonthFirstDay/1000+7*86400)*1000)}//下月第一天function showNextFirstDay(){var MonthFirstDay=showMonthFirstDay()return new Date(MonthFirstDay.getYear(),MonthFirstDay.getMonth()+1,1)}//下月最后一天function showNextLastDay(){var MonthFirstDay=showMonthFirstDay()return new Date(new Date(MonthFirstDay.getYear(),MonthFirstDay.getMonth()+2,1)-86400000)}function Date.prototype.toString(){return this.getFullYear()+"-"+(this.getMonth()+1)+"-"+this.getDate();}function setDate(num){if(num==1){document.all.dateDate.value=showMonthFirstDay();document.all.dateDate2.value=showMonthLastDay();}if(num==2){document.all.dateDate.value=showWeekFirstDay();document.all.dateDate2.value=showWeekLastDay();}if(num==3){document.all.dateDate.value=showToDay();document.all.dateDate2.value=showToDay();}if(num==4){document.all.dateDate.value=showPreviousFirstDay();document.all.dateDate2.value=showPreviousLastDay();}if(num==5){document.all.dateDate.value=showNextFirstDay();document.all.dateDate2.value=showNextLastDay();}if(num==6){document.all.dateDate.value=showPreviousFirstWeekDay();document.all.dateDate2.value=showPreviousLastWeekDay();}if(num==7){document.all.dateDate.value=showNextFirstWeekDay();document.all.dateDate2.value=showNextLastWeekDay();}if(num==8){document.all.dateDate.value=showPreviousDay();document.all.dateDate2.value=showPreviousDay();}if(num==9){document.all.dateDate.value=showNextDay();document.all.dateDate2.value=showNextDay();}}// --></mce:script><input name=dateDate type=text>-><input name=dateDate2 type=text> <input name=haha type=button value="上一月" onclick=setDate(4)>  <input name=haha type=button value="本月" onclick=setDate(1)> <input name=haha type=button value="下一月" onclick=setDate(5)> <input name=haha type=button value="上一周" onclick=setDate(6)> <input name=haha type=button value="本周" onclick=setDate(2)> <input name=haha type=button value="下一周" onclick=setDate(7)> <input name=haha type=button value="上一天" onclick=setDate(8)> <input name=haha type=button value="今天" onclick=setDate(3)> <input name=haha type=button value="下一天" onclick=setDate(9)>可以灵活组合