JavaScript中的两个日期之间的差异 [英] Difference in Months between two dates in JavaScript

问题描述

如何在JavaScript中找出两个Date（）对象的差异，而只返回几个月的差异？

How would I work out the difference for two Date() objects in JavaScript, while only return the number of months in the difference?

任何帮助都会很好：）

推荐答案

差异中的月数的定义受到很多的解释。 ： - ）

The definition of "the number of months in the difference" is subject to a lot of interpretation. :-)

您可以从JavaScript日期对象获取月，月和日。根据您要查找的信息，您可以使用这些数据来确定两点之间有多少个月。

You can get the year, month, and day of month from a JavaScript date object. Depending on what information you're looking for, you can use those to figure out how many months are between two points in time.

例如， ，这会发现两个日期之间有多少个月，不包括部分月份（例如，不包括每个日期所在的月份）：

For instance, off-the-cuff, this finds out how many full months lie between two dates, not counting partial months (e.g., excluding the month each date is in):

function monthDiff(d1, d2) {
    var months;
    months = (d2.getFullYear() - d1.getFullYear()) * 12;
    months -= d1.getMonth() + 1;
    months += d2.getMonth();
    return months <= 0 ? 0 : months;
}

monthDiff(
    new Date(2008, 10, 4), // November 4th, 2008
    new Date(2010, 2, 12)  // March 12th, 2010
);
// Result: 15: December 2008, all of 2009, and Jan & Feb 2010

monthDiff(
    new Date(2010, 0, 1),  // January 1st, 2010
    new Date(2010, 2, 12)  // March 12th, 2010
);
// Result: 1: February 2010 is the only full month between them

monthDiff(
    new Date(2010, 1, 1),  // February 1st, 2010
    new Date(2010, 2, 12)  // March 12th, 2010
);
// Result: 0: There are no *full* months between them

（注意JavaScript中的月份值以0 = 1月开始。）

(Note that month values in JavaScript start with 0 = January.)

在上述中包括小数月份要复杂得多，因为典型的二月份的三天是那个月（〜10.714％）比八月份的三天多（〜9.677％），当然甚至二月是一个移动目标，取决于是闰年。

Including fractional months in the above is much more complicated, because three days in a typical February is a larger fraction of that month (~10.714%) than three days in August (~9.677%), and of course even February is a moving target depending on whether it's a leap year.

还有一些可用于JavaScript的日期和时间库可能使这种事情变得更容易。

There are also some date and time libraries available for JavaScript that probably make this sort of thing easier.

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