获取Date对象（半年前），从另一个日期对象

Question

如何创建一个日期对象小于ň个月的数量从另一个约会对象？我正在寻找类似DateAdd()的东西。

例子：

var objCurrentDate = new Date(); 

现在使用objCurrentDate，我怎么能产生具有日期比今天的日期/ objCurrentDate大6个月Date对象？

Answer 1

您可以实现非常容易的“addMonths”功能：

function addMonths(date, months) { 
    date.setMonth(date.getMonth() + months); 
    return date; 
} 


addMonths(new Date(), -6); // six months before now 
// Thu Apr 30 2009 01:22:46 GMT-0600 

addMonths(new Date(), -12); // a year before now 
// Thu Oct 30 2008 01:20:22 GMT-0600 

Answer 2

var oldDate:Date = new Date(); 
/* 
Check and adjust the date - 
At the least, make sure that the getDate() returns a 
valid date for the calculated month and year. 
If it's not valid, change the date as per your needs. 
You might want to reset it to 1st day of the month/last day of the month 
or change the month and set it to 1st day of next month or whatever. 
*/ 
if(oldDate.getMonth() < n) 
    oldDate.setFullYear(oldDate.getFullYear() - 1); 
oldDate.setMonth((oldDate.getMonth() + n) % 12); 

Answer 3

创建Date对象，并通过n的值，其中n是月数（加/减）。

var dateObj = new Date(); 
    var requiredDate= dateObj.setMonth(dateObj.getMonth() - n);