Question

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Get timezone difference in hours with moment

rated 0 times [ 33] [ 7] / answers: 1 / hits: 20360 / 9 Years ago, fri, november 13, 2015, 12:00:00

I would like to get the timezone difference between New York and Hong Kong with Node.js moment module. I have done some preliminary work.

var NewYork_time_hr = moment().tz(America/New_York).format('HH'); 

var HongKong_time_hr = moment().tz(Asia/Hong_Kong).format('HH');

I can then proceed to write a function to calculate the difference between the 2 timezones in hours. I was hoping for a simpler method.

Is there a more elegant and simpler way to do it with moment library?

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aiyannam

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3 Years ago

answered 9 Years ago turnerf · Accepted Answer

Not sure about simpler, but more correct (since not all timezones are a full hour from each other):

// get the current time so we know which offset to take (DST is such bullkitten)

var now = moment.utc();

// get the zone offsets for this time, in minutes

var NewYork_tz_offset = moment.tz.zone(America/New_York).offset(now); 

var HongKong_tz_offset = moment.tz.zone(Asia/Hong_Kong).offset(now);

// calculate the difference in hours

console.log((NewYork_tz_offset - HongKong_tz_offset) / 60);

<script src=https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.6/moment.min.js></script>

<script src=https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.4.1/moment-timezone-with-data-2010-2020.min.js></script>