Question

24

Work with a time span in Javascript

rated 0 times [ 26] [ 2] / answers: 1 / hits: 154769 / 12 Years ago, sat, january 12, 2013, 12:00:00

Using Date.js already, but can also use another library if necessary.

Not sure what is the best way to work with time deltas. Specifically, I want to display the time that has elapsed between now and a past date-time.

So I need to do something like this:

var elapsed_time = new Date() - pastDate;

pastDate.toString('days-hours-minutes-seconds');

Gotten it to mostly work using Date.js, but the problem is now I'm working with a Date object and not a timespan, so what should be an 23 hour time span is instead 23 hours after the Date's very first time:



var result = (new Date()) - past_date;

result is the number (probably milliseconds): 15452732



var result = (new Date() - past_date

result is a date from 1969: Wed Dec 31 1969 23:17:32

What I need is:



0 days 23 hours 17 minutes and 32 seconds

Any ideas?

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daja

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answered 12 Years ago odaliss · Accepted Answer

Sounds like you need moment.js

e.g.

moment().subtract('days', 6).calendar();

=> last Sunday at 8:23 PM

moment().startOf('hour').fromNow();

=> 26 minutes ago

Edit:

Pure JS date diff calculation:

var date1 = new Date(7/Nov/2012 20:30:00);

var date2 = new Date(20/Nov/2012 19:15:00);



var diff = date2.getTime() - date1.getTime();



var days = Math.floor(diff / (1000 * 60 * 60 * 24));

diff -=  days * (1000 * 60 * 60 * 24);



var hours = Math.floor(diff / (1000 * 60 * 60));

diff -= hours * (1000 * 60 * 60);



var mins = Math.floor(diff / (1000 * 60));

diff -= mins * (1000 * 60);



var seconds = Math.floor(diff / (1000));

diff -= seconds * (1000);



document.write(days +  days,  + hours +  hours,  + mins +  minutes,  + seconds +  seconds);