我怎么知道下个生日的天数？ [英] How do I get the how many days until my next birthday?

问题描述

我尝试了这个但它失败了

I tried this but it fails

var diffDays1=(function(){ 
var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var secondDate = new Date(new Date().getFullYear()+1,4,5);
var firstDate = new Date();
 return Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)));
})();

Wolfram alpha说它是330天，diffDays1显示它是359.这可能是由于夏令时或其他什么。有没有办法准确计算天数，因为没有做服务器端。

Wolfram alpha says it's 330 days, diffDays1 shows it's 359. This is probably due to daylight savings or something. Is there a way to accurately calculate days since without doing it server side.

推荐答案

问题在于你是以月为基础的在四月是4，当四月是3在Javascript。请参阅 https://developer.mozilla.org/en- US / docs / JavaScript / Reference / Global_Objects / Date＃Parameters

The problem is that you're basing the month on April being 4, when April is 3 in Javascript. See https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Date#Parameters

var diffDays1=(function(){ 
    var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
    var secondDate = new Date(new Date().getFullYear()+1,3,5);
    var firstDate = new Date();
    return Math.round(Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay)));
})();

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