js 獲取前一天的時 var today=new Date(); var yesterday_milliseconds=today.getTime()-1000*60*60*24; var yesterday=new Date();yesterday.setTime(yesterday_milliseconds);var strYear=yesterday.getFullYear(); var strDay=yesterday.getDate(); var strMonth=yesterday.getMonth()+1; if(strMonth<10) { strMonth="0"+strMonth; }var strYesterday=strYear+"-"+strMonth+"-"+strDay; alert(strYesterday);

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Js獲取當前日期時間及其它操作var myDate = new Date(); //獲取當前年份(2位) myDate.getYear(); //獲取完整的年份(4位,1970-????) myDate.getFullYear(); //獲取當前月份(0-11,0代表1月)myDate.getMonth(); //獲取當前日(1-31) myDate.getDay(); //獲取當前星期X(0-6,0代表星期天) myDate.getDate(); //獲取當前時間(從1970.1.1開始的毫秒數) myDate.getTime(); //獲取當前小時數(0-23) myDate.getHours(); //獲取當前分鐘數(0-59) myDate.getMinutes(); //獲取當前秒數(0-59) myDate.getSeconds(); //獲取當前毫秒數(0-999) myDate.getMilliseconds(); //獲取當前日期 myDate.toLocaleDateString(); //獲取當前時間var mytime=myDate.toLocaleTimeString(); //獲取日期與時間myDate.toLocaleString( );

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判斷閏年 Date.prototype.isLeapYear = function(){ return (0==this.getYear()%4&&((this.getYear()%100!=0)||(this.getYear()%400==0))); }

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// 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 時間 // mm/m 分鐘 // 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;}

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//| 求兩個時間的天數差 日期格式為 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); } //| 日期計算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()); }
} //| 比較日期差 dtEnd 格式為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' )//如果是字符串轉換為日期型 { 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(); } } //| 日期輸出字符串，重載了系統的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; } //| 日期合法性驗證 //| 格式為：YYYY-MM-DD或YYYY/MM/DD // function IsValidDate(DateStr) {var sDate=DateStr.replace(/(^\s+|\s+$)/g,''); //去兩邊空格; if(sDate=='') return true; //如果格式滿足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替換為''//數據庫中，合法日期可以是:YYYY-MM/DD(2003-3/21),數據庫會自動轉換為YYYY-MM-DD格式 var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g,'');if (s=='') //說明格式滿足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('錯誤的日期格式！格式為：YYYY-MM-DD或YYYY/MM/DD。注意閏年。');return false; } } else { //alert('錯誤的日期格式！格式為：YYYY-MM-DD或YYYY/MM/DD。注意閏年。');return false; } return true; } //| 取得日期數據信息 //| 參數 interval 表示數據類型 //| y 年 m月 d日 w星期 ww周 h時 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; } //| 取得當前日期所在月的最大天數 //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; }//| 取得當前日期所在周是一年中的第幾周 //+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; } //| 字符串轉成日期類型 //| 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; } 若要顯示:當前日期加時間(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(); //時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); }

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轉載于:https://www.cnblogs.com/sily-boy/p/5703409.html

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