Timezone support using Moment.js

moment_tz_examples.js

// get the user's timezone
var tz = moment.tz.guess();
console.info('Timezone: ' + tz);
// returns: Timezone: Europe/London

// set the default user timezone
moment.tz.setDefault(tz);

// set custom timezone
moment.tz.setDefault('America/Los_Angeles');

// convert date / time to local timezone, assumes original date/time is in UTC
moment.utc('2016-12-25 07:00').tz(tz).format('ddd, Do MMMM YYYY, h:mma');
// returns: Sun, 25th December 2016, 7:00am

// convert date/time to LA Time
moment.utc('2016-12-25 07:00').tz('America/Los_Angeles').format('ddd, Do MMMM YYYY, h:mma');
// returns: Sat, 24th December 2016, 11:00pm

// convert from LA time to London
moment.tz('2016-12-25 07:00', 'America/Los_Angeles').tz('Europe/London').format( 'ddd, Do MMMM YYYY, h:mma' );
// returns: Sun, 25th December 2016, 3:00pm