js时间

<script language="JavaScript">
//定义一个tick函数，以获取系统的时间
function tick()
{
var year,month,day,hours,minutes,seconds,ap;
var intYear,intMonth,intDay,intHours,intMinutes,intSeconds;
var today;
today=new Date();
intYear=today.getYear();
intMonth=today.getMonth()+1;
intDay=today.getDate();
intHours=today.getHours();
intMinutes=today.getMinutes();
intSeconds=today.getSeconds();
//获取系统时间的小时数
if(intHours==0)
{
hours=intHours+":";
ap="凌晨";
}
else if(intHours<12)
{
hours=intHours+":";
ap="早晨";
}
else if(intHours==12)
{
hours=intHours+":";
ap="中午";
}
else
{
intHours=intHours-12;
hours=intHours+":";
ap="下午";
}
//获取系统时间的分数
if(intMinutes<10)
{
minutes="0"+intMinutes+":";
}
else
minutes=intMinutes+":";
//获取系统时间的秒数
if(intSeconds<10)
seconds="0"+intSeconds+" ";
else
seconds=intSeconds+" ";
timeString=year+month+day+hours+minutes+seconds+ap;
Clock.innerHTML=timeString;
//每隔0.1秒钟执行一次tick函数
window.setTimeout("tick()",100);
}
window.onload=tick;
</script>

下面这句是调用函数

<SCRIPT language=JavaScript>
var day="";
var month="";
var ampm="";
var ampmhour="";
var myweekday="";
var year="";
mydate=new Date();
myweekday=mydate.getDay();
mymonth=mydate.getMonth()+1;
myday= mydate.getDate();
myyear= mydate.getYear();
year=(myyear > 200) ? myyear : 1900 + myyear;
if(myweekday == 0)
weekday=" 星期日 ";
else if(myweekday == 1)
weekday=" 星期一 ";
else if(myweekday == 2)
weekday=" 星期二 ";
else if(myweekday == 3)
weekday=" 星期三 ";
else if(myweekday == 4)
weekday=" 星期四 ";
else if(myweekday == 5)
weekday=" 星期五 ";
else if(myweekday == 6)
weekday=" 星期六 ";
document.write("<font color=#ff0000>北京时间 "+year+"年"+mymonth+"月"+myday+"日 "+weekday+"</font>");
</SCRIPT>

function getSysDate(){
	var today = new Date();
	var day   = today.getDate();                  
	var month = today.getMonth() + 1;
	var year  = today.getYear();
	var hours = today.getHours();
	var minute = today.getMinutes();
	
	month = month<10?"0"+month:month;        
	day = day<10?"0"+day:day;            
	var date = year + "-" + month + "-" + day + " "+hours +":"+minute; 
	alert('--date---'+date);
}

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

//---------------------------------------------------   
// 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;   
}   
function getSysDate(){   
  
    var today = new Date();      
    var day   = today.getDate();                        
    var month = today.getMonth() + 1;      
    var year  = today.getYear();      
    var hours = today.getHours();      
    var minute = today.getMinutes();   
//获取昨天的日期   
    var zt = new Date(today.getYear(),today.getMonth(),today.getDate()-1);          
    month = month<10?"0"+month:month;//如果小于10即显示为09月        
    day = day<10?"0"+day:day;//如果小于10即显示为09日          
    var zt_Month = zt.getMonth()*1+1;   
    var zt_date = zt.getDate();   
    zt_Month = zt_Month<10?"0"+zt_Month:zt_Month;   
    zt_date = zt_date<10?"0"+zt_date:zt_date;           
    document.getElementById('year1').value = zt.getYear();   
    document.getElementById('year2').value = year;   
    document.getElementById('month1').value = zt_Month;   
    document.getElementById('month2').value = month;   
    document.getElementById('day1').value = zt_date;   
    document.getElementById('day2').value = day;   
    document.getElementById('hour1').value = '00';   
    document.getElementById('hour2').value = '00';   
    document.getElementById('minute1').value = '00';   
    document.getElementById('minute2').value = '00';   
    var date = year + "-" + month + "-" + day + " "+hours +":"+minute;     
    //alert('---'+date);   
    return date;   
}