Question

108

Compare 2 ISO 8601 timestamps and output seconds/minutes difference

rated 0 times [ 115] [ 7] / answers: 1 / hits: 55191 / 11 Years ago, fri, august 2, 2013, 12:00:00

I need to write JavaScript that's going to allow me to compare two ISO timestamps and then print out the difference between them, for example: 32 seconds.

Below is a function I found on Stack Overflow, it turns an ordinary date into an ISO formatted one. So, that's the first thing out the way, getting the current time in ISO format.

The next thing I need to do is get another ISO timestamp to compare it with, well, I have that stored in an object. It can be accessed like this: marker.timestamp (as shown in the code below). Now I need to compare those two two timestamps and work out the difference between them. If it's < 60 seconds, it should output in seconds, if it's > 60 seconds, it should output 1 minute and 12 seconds ago for example.

Thanks!

function ISODateString(d){

 function pad(n){return n<10 ? '0'+n : n}

 return d.getUTCFullYear()+'-'

      + pad(d.getUTCMonth()+1)+'-'

      + pad(d.getUTCDate())+'T'

      + pad(d.getUTCHours())+':'

      + pad(d.getUTCMinutes())+':'

      + pad(d.getUTCSeconds())+'Z'}



var date = new Date();

var currentISODateTime = ISODateString(date);

var ISODateTimeToCompareWith = marker.timestamp;



// Now how do I compare them?

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anais

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1 Year ago

answered 11 Years ago stefanicarolinat · Accepted Answer

Comparing two dates is as simple as

var differenceInMs = dateNewer - dateOlder;

So, convert the timestamps back into Date instances

var d1 = new Date('2013-08-02T10:09:08Z'), // 10:09 to

    d2 = new Date('2013-08-02T10:20:08Z'); // 10:20 is 11 mins

Get the difference

var diff = d2 - d1;

Format this as desired

if (diff > 60e3) console.log(

    Math.floor(diff / 60e3), 'minutes ago'

);

else console.log(

    Math.floor(diff / 1e3), 'seconds ago'

);

// 11 minutes ago