js 获取前一天的时
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);
Js获取当前日期时间及其它操作
var myDate = new Date();
//获取当前年份(2位)
myDate.getYear();
//获取完整的年份(4位,1970-????)
myDate.getFullYear();
//获取当前月份(0-11,0代表1月)
myDate.getMonth();
//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.getDate();
//获取当前时间(从1970.1.1开始的毫秒数)
myDate.getTime();
//获取当前小时数(0-23)
myDate.getHours();
//获取当前分钟数(0-59)
myDate.getMinutes();
//获取当前秒数(0-59)
myDate.getSeconds();
//获取当前毫秒数(0-999)
myDate.getMilliseconds();
//获取当前日期
myDate.toLocaleDateString();
//获取当前时间
var mytime=myDate.toLocaleTimeString();
//获取日期与时间
myDate.toLocaleString( );
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; }
//| 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 = Datue(\'\'+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; }
若要显示:当前日期加时间(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(); //时
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); }