如何计算两个日期之间的年数？

问题描述

我想得到两个日期之间的年数。我可以得到这两天之间的天数，但是如果我把它除以365，结果是不正确的，因为有几年有366天。

这是我的代码获取日期差异：

  var birthday = value; // format 01/02/1900 
 var dateParts = birthday。分裂（/）; 
 
 var checkindate = new Date（dateParts [2]，dateParts [0]  -  1，dateParts [1]）; 
 var now = new Date（）; 
 var difference = now  -  checkindate; 
 var days =差异/（1000 * 60 * 60 * 24）; 
 
 var thisyear = new Date（）。getFullYear（）; 
 var birthyear = dateParts [2]; 
 
 var number_of_long_years = 0; $（$ y = 0）= $（$）$（$）$（$） y％400 == 0）{
 
 number_of_long_years ++; 
} 
} 
  

日期计数完美。我正在尝试添加额外的日子，这是一个366天的一年，我正在做这样的事情：

  var years =（（days）*（thisyear-birthyear））
 /（（number_of_long_years * 366）+（（thisyear-birthyear-number_of_long_years）* 365））; 
  

我得到年数。这是正确的，还是有更好的方法呢？

解决方案

这对你有帮助：

I want to get the number of years between two dates. I can get the number of days between these two days, but if I divide it by 365 the result is incorrect because some years have 366 days.

This is my code to get date difference:

var birthday = value;//format 01/02/1900
var dateParts = birthday.split("/");

var checkindate = new Date(dateParts[2], dateParts[0] - 1, dateParts[1]);
var now = new Date();
var difference = now - checkindate;
var days = difference / (1000*60*60*24);

var thisyear = new Date().getFullYear();
var birthyear = dateParts[2];

    var number_of_long_years = 0;
for(var y=birthyear; y <= thisyear; y++){

    if( (y % 4 == 0 && y % 100 == 0) || y % 400 == 0 ) {

                    number_of_long_years++;
    }
}

The day count works perfectly. I am trying to do add the additional days when it is a 366-day year, and I'm doing something like this:

var years = ((days)*(thisyear-birthyear))
            /((number_of_long_years*366) + ((thisyear-birthyear-number_of_long_years)*365) );

I'm getting the year count. Is this correct, or is there a better way to do this?

解决方案

this can be helpful for you:

http://romcartridge.blogspot.com/2010/01/javascript-function-to-calculate-age.html

Calculate age in JavaScript

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