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JS日期相加减函数整理

时间:2021-07-01 10:21:17 帮助过:32人阅读

// 增加天
function AddDays(date,value)
{
date.setDate(date.getDate()+value);
}
// 增加月
function AddMonths(date,value)
{
date.setMonth(date.getMonth()+value);
}
// 增加年
function AddYears(date,value)
{
date.setFullYear(date.getFullYear()+value);
}
// 是否为今天
function IsToday(date)
{
return IsDateEquals(date,new Date());
}
// 是否为当月
function IsThisMonth(date)
{
return IsMonthEquals(date,new Date());
}
// 两个日期的年是否相等
function IsMonthEquals(date1,date2)
{
return date1.getMonth()==date2.getMonth()&&date1.getFullYear()==date2.getFullYear();
}
// 判断日期是否相等
function IsDateEquals(date1,date2)
{
return date1.getDate()==date2.getDate()&&IsMonthEquals(date1,date2);
}
// 返回某个日期对应的月份的天数
function GetMonthDayCount(date)
{
switch(date.getMonth()+1)
{
case 1:case 3:case 5:case 7:case 8:case 10:case 12:
return 31;
case 4:case 6:case 9:case 11:
return 30;
}
//feb:
date=new Date(date);
var lastd=28;
date.setDate(29);
while(date.getMonth()==1)
{
lastd++;
AddDays(date,1);
}
return lastd;
}
// 返回两位数的年份
function GetHarfYear(date)
{
var v=date.getYear();
if(v>9)return v.toString();
return "0"+v;
}
// 返回月份(修正为两位数)
function GetFullMonth(date)
{
var v=date.getMonth()+1;
if(v>9)return v.toString();
return "0"+v;
}
// 返回日 (修正为两位数)
function GetFullDate(date)
{
var v=date.getDate();
if(v>9)return v.toString();
return "0"+v;
}
// 替换字符串
function Replace(str,from,to)
{
return str.split(from).join(to);
}
// 格式化日期的表示
function FormatDate(date,str)
{
str=Replace(str,"yyyy",date.getFullYear());
str=Replace(str,"MM",GetFullMonth(date));
str=Replace(str,"dd",GetFullDate(date));
str=Replace(str,"yy",GetHarfYear(date));
str=Replace(str,"M",date.getMonth()+1);
str=Replace(str,"d",date.getDate());
return str;
}
// 统一日期格式
function ConvertDate(str)
{
str=(str+"").replace(/^\s*/g,"").replace(/\s*$/g,""); // 去除前后的空白
var d;
if(/^[0-9]{8}$/.test(str)) // 20040226 -> 2004-02-26
{
d=new Date(new Number(str.substr(0,4)),new Number(str.substr(4,2))-1,new Number(str.substr(6,2)));
if(d.getTime())return d;
}
d=new Date(str);
if(d.getTime())return d;
d=new Date(Replace(str,"-","/"));
if(d.getTime())return d;
return null;
}
js时间差函数
<SCRIPT LANGUAGE=javascript>
alert(addDay(-30,1));
alert(addDay(-30,2));
alert(addDay(-30,3));
alert(addDay(-30,0));
function addDay(days,n)
{
//函数说明:days日期差,n代表如下含义。
var my_date_ago=new Date(new Date() - days * 24 * 60 * 60 * 1000 * -1);//days天的日期
switch (n)
{
case 1:
//返回年
return(my_date_ago.getFullYear());
break;
case 2:
//返回月
return(my_date_ago.getMonth()+1);
break;
case 3:
//返回日
return(my_date_ago.getDate());
break;
default :
//返回全部
return(my_date_ago.getFullYear() + "-" + (my_date_ago.getMonth()+1) + "-" + my_date_ago.getDate());
break;
}
}
//求兩個日期的天數差,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);
}

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