在JS中比较两个日期 [英] Compare two dates in JS

问题描述

我想将用户的生日与今天的日期进行比较，并得到其间的天数。他们输入的生日将以 类型的输入框中以 12/02/1987 的形式

I want to compare the user's birthday against today's date and get the number of days in between. The birthday they enter will be in the form of 12/02/1987 in an input box of type text

在我的JS文件中，我有如下代码：

In my JS file I have code that looks like this:

function validateDOB(element) {
var valid = false;

var today = new Date();
var dd = today.getDate();
var mm = today.getMonth() + 1; //do that January is NOT represented by 0!
var yyyy = today.getFullYear();

if (dd < 10) {
    dd = '0' + dd
}
if (mm < 10) {
    mm = '0' + mm
}

var today = mm + '/' + dd + '/' + yyyy;
alert(today);
if (element.value != today) {
    var days = 0;
    var difference = 0;

    Christmas = new Date("December 25, 2011");

    today = new Date();

    difference = today - Christmas

    days = Math.round(difference / (1000 * 60 * 60 * 24)-1);
    alert(days); 
    valid = true;
}

而不是使用圣诞节我想比较 element.value ...我该怎么做？

Instead of using "Christmas" I want to compare element.value... how do I do this?

当我把 difference = today - element.value 它不会显示我的区别。警报框出现为 NaN 。

When I put difference = today - element.value it won't show me the difference. The alert box comes up as NaN.

推荐答案

您需要首先将 element.value 日期：

difference = today - new Date(element.value);

http://jsfiddle.net/gilly3/3DKfy/

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