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javascriptmomentjsmoment-timezone

MomentJS diff is adding an hour

I am doing this

const currentCETTime = moment.tz('2020-03-18 15:58:38', 'Europe/Madrid');
const limitCETTime = moment.tz('2020-03-18 18:00:00', 'Europe/Madrid');
console.log('current',currentCETTime.format('HH:mm:ss'));
console.log('limit', limitCETTime.format('HH:mm:ss'));
const seconds = Math.abs(limitCETTime.diff(currentCETTime) / 1000);
console.log('hours', (seconds / 60) / 60);
const rem = moment(seconds * 1000);
console.log('diff', moment(rem).tz('Europe/Madrid').format('HH:mm'));
<script src="https://momentjs.com/downloads/moment.min.js"></script>
<script src="https://momentjs.com/downloads/moment-timezone-with-data-10-year-range.min.js"></script>

And I am getting a wrong difference:

enter image description here

I should get a difference of 2:01 hours instead of 03:01

Solution

  • If you just need hour and second, then no need to use timezone. You can call utc and then format. Check code below.

    const currentCETTime = moment.tz('2020-03-18 15:58:38', 'Europe/Madrid');
const limitCETTime = moment.tz('2020-03-18 18:00:00', 'Europe/Madrid');
console.log('current',currentCETTime.format('HH:mm:ss'));
console.log('limit', limitCETTime.format('HH:mm:ss'));
const seconds = Math.abs(limitCETTime.diff(currentCETTime) / 1000);
console.log('hours', (seconds / 60) / 60);
const rem = moment(seconds * 1000);
console.log('diff', moment(rem).utc().format('HH:mm'));
    <script src="https://momentjs.com/downloads/moment.min.js"></script>
<script src="https://momentjs.com/downloads/moment-timezone-with-data-10-year-range.min.js"></script>