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Detailed explanation of javascript date operations (organized by Script House)_Time and date
Detailed explanation of javascript date operations (organized by Script House)_Time and date
它是一个内置对象——而不是其它对象的属性,允许用户执行各种使用日期和时间的过程。
方法：分为得到时间方法、设置时间方法和转换时间方法
得到时间方法：
getDate() 查看Date对象并返回日期
getDay() 返回星期几
getHours() 返回小时数
getMinutes() 返回分钟数
getMonth() 返回月份值
getSeconds() 返回秒数
getTime() 返回完整的时间
getYear() 返回年份
js中的日期时间函数具体使用注意事项： 月份获取的时候会-1. 例如当前是12月份，获取的数字就是11
var date = new Date();
date.getYear(); //获取年份(2位)
date.getFullYear(); //获取完整的年份(4位,1970-)
date.getMonth(); //获取月份(0-11,0代表1月，所以在显示当前时间的时候需要date.getMonth() + 1）
date.getDate(); //获取日(1-31)
date.getDay(); //获取星期?(0-6,0代表星期天)
date.getTime(); //获取时间(从1970.1.1开始的毫秒数)
date.getHours(); //获取小时数(0-23)
date.getMinutes(); //获取分钟数(0-59)
date.getSeconds(); //获取秒数(0-59)
date.getMilliseconds(); //获取毫秒数(0-999)
date.toLocaleString(); //获取日期与时间
设置时间方法：
setDate() 改变Date对象的日期
setHours() 改变小时数
setMinutes() 改变分钟数
setMonth() 改变月份
setSeconds() 改变秒数
setTime() 改变完整的时间
setYear() 改变年份
转换时间方法：
toGMTString() 把Date对象的日期(一个数值)转变成一个GMT时间字符串,返回类似下面的值:Weds,15 June l997 14:02:02 GMT(精确的格式依赖于计算机上所运行的操作系统而变)
toLocaleString() 把Date对象的日期(一个数值)转变成一个字符串,使用所在计算机上配置使用的特定日期格式
UTC() 使用Date UTC(年、月、日、时、分、秒),以自从1970年1月1日00:00:00(其中时、分、秒是可选的)以来的毫秒数的形式返回日期
几个需要注意的地方：
最重要的一点就是考虑到多浏览器的兼容性。需要按如下格式获取日期比较好
var timestart = '2015-09-05'; var timeend = '2015-09-06'; var time1 = (timestart+' 00:00:00').toString(); var time2 = (timeend+' 23:59:59').toString(); timestart = new Date(Date.parse(time1.replace(/-/g,"/"))).getTime(); timeend = new Date(Date.parse(time2.replace(/-/g,"/"))).getTime();
脚本之家小编为大家提供一个刚写的，在某一个时间段才显示的广告代码
<script type="text/javascript">
var timestart = '2015-09-05';
var timeend = '2015-09-06';
var time1 = (timestart+' 16:00:00').toString();
var time2 = (timeend+' 16:00:00').toString();
timestart = new Date(Date.parse(time1.replace(/-/g,"/"))).getTime();
timeend = new Date(Date.parse(time2.replace(/-/g,"/"))).getTime();
var nowtime=new Date().getTime();
if (nowtime>timestart && nowtime<timeend)
{
document.write("广告");
}
</script>1、得到日期和年和设置日期和年时间，其中很怪的问题就是不能对月份进行设置（比较的怪）：
<script language="javascript"> d = new Date(); alert(d.toLocaleString()); d.setDate(25); alert(d.toLocaleString()); d.setYear(2000); alert(d.toLocaleString()); </script>
2、获得年的时候最好用getFullYear()方法来做
3、由于针对月份，JS是从0开始的，因此需要对月份进行操作时要加1
下面是几个关于时间的经典而且经常会用到的例子，希望对大家会有提高的。谢谢继续关注该帖子。。。
1、将2005-8-5转换成2005-08-05格式
<script language="javascript"> var strDate = '2005-8-5'; window.alert(strDate.replace(/\b(\w)\b/g, '0$1')); </script>
2、得到间隔天数
<script type="text/javascript">
<!--
alert("间隔天数为:"+(new Date('2005/8/15')-new Date('2003/9/18'))/1000/60/60/24+"天")
//-->
</script> 3、得到间隔时间
<script>
var d1=new Date("2004/09/16 20:08:00");
var d2=new Date("2004/09/16 10:18:03");
var d3=d1-d2;
var h=Math.floor(d3/3600000);
var m=Math.floor((d3-h*3600000)/60000);
var s=(d3-h*3600000-m*60000)/1000;
alert("相差"+h+"小时"+m+"分"+s+"秒");
</script> 4、得到今天的日期
<script language="javascript"> d = new Date(); alert(d.getFullYear()+"年"+(d.getMonth()+1)+"月"+d.getDate()+"日"); </script>
6、数字日期转汉字
<html>
<head>
<title> New Document </title>
</head>
<body>
<script language=javascript>
Date.prototype.getRead = function()
{
var values = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九");
var returnValue, temp;
returnValue = this.getYear()+"年";
temp = (this.getMonth()+1)+"月"+this.getDate()+"日";
temp = temp.replace(/(\d)(\d)/g,"$1十$2").replace(/1十/g,"十").replace(/十0/g,"十");
returnValue += temp;
returnValue = returnValue.replace(/\d/g, function(sts){return values[parseInt(sts)]});
return returnValue;
}
var t=new Date();
document.write(t.getRead());
</script>
</body>
</html>7、得到前N天或后N天的日期
方法一：
<script type="text/javascript">
function showdate(n)
{
var uom = new Date(new Date()-0+n*86400000);
uom = uom.getFullYear() + "-" + (uom.getMonth()+1) + "-" + uom.getDate();
return uom;
}
window.alert("今天是："+showdate(0));
window.alert("昨天是："+showdate(-1));
window.alert("明天是："+showdate(1));
window.alert("10天前是："+showdate(-10));
window.alert("5天后是："+showdate(5));
</script> 方法二：
<script type="text/javascript">
function showdate(n)
{
var uom = new Date();
uom.setDate(uom.getDate()+n);
uom = uom.getFullYear() + "-" + (uom.getMonth()+1) + "-" + uom.getDate();
return uom;
}
window.alert("今天是："+showdate(0));
window.alert("昨天是："+showdate(-1));
window.alert("明天是："+showdate(1));
window.alert("10天前是："+showdate(-10));
window.alert("5天后是："+showdate(5));
</script> 方法三（不好意思，这个用vsscript做的，仅作为学习使用，不建议网页中使用，毕竟 IE only）：
<script language="vbscript">
function showdate(n)
showdate=dateadd("d",date(),n)
end function
msgbox "今天是:"&showdate(0)
msgbox "昨天是:"&showdate(-1)
msgbox "明天是:"&showdate(1)
msgbox "十天前是:"&showdate(-10)
msgbox "五天后是:"&showdate(5)
</script> 方法四：
<script language="Javascript">
Date.prototype.getDays=function(){
var _newDate=new Date();
_newDate.setMonth(_newDate.getMonth()+1);
_newDate.setDate(0);
$_days=_newDate.getDate();
delete _newDate;
return $_days;
}
function showdate(n)
{
var uom = new Date();
uom.setDate(uom.getDate()+n);
uom = uom.getFullYear() + "-" + (uom.getMonth()+1) + "-" + uom.getDate()+"\n星期"+('天一二三四五六'.charAt(uom.getDay()))+"\n本月有"+ uom.getDays()+"天";
return uom;
}
window.alert("今天是："+showdate(0));
window.alert("昨天是："+showdate(-1));
window.alert("明天是："+showdate(1));
window.alert("10天前是："+showdate(-10));
window.alert("5天后是："+showdate(5));
</script> 
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