Question

114

How do I get the how many days until my next birthday?

rated 0 times [ 120] [ 6] / answers: 1 / hits: 16354 / 11 Years ago, fri, may 10, 2013, 12:00:00

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 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.

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robertjaysona

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3 Years ago

answered 11 Years ago josefn · Accepted Answer

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)));

})();