Home/ Questions/Q 6547619
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-25T11:51:09+00:00

I use the following to calculate the difference between two dates in JavaScript: var

  • 0

I use the following to calculate the difference between two dates in JavaScript:

var dateOne = new Date; // Now
var dateTwo = new Date( dateOne.getTime() + 60 * 1000 ); // Now + One Minute
var difference = new Date( dateTwo - dateOne );

So, logically, difference should be one minute. But Firebug tells me that the difference is one hour off, and the timezone somehow also changes!

 dateOne = Date {Sun Sep 11 2011 01:07:55 GMT+0200 (CET)}
 dateTwo = Date {Sun Sep 11 2011 01:08:55 GMT+0200 (CET)}
 difference = Date {Thu Jan 01 1970 01:01:00 GMT+0100 (CET)}

How can I fix this?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Date is designed for storing exact dates and times, not differences between dates and times. Subtracting those Date objects yields the number of milliseconds between those two dates. You then create a new Date with that number of milliseconds since the Epoch. Since the Epoch is midnight of January 1, 1970, the result will be 12:01 AM of January 1, 1970. Daylight savings time changes the timezone a little.

    • 0