How to set user's timezone?

I am running ejabberd 15.04 on Linux.
We have users in multiple timezones. How do I configure their correct timezones?

Thanks in advance.

ejabberd does not require

ejabberd does not require such "timezone" concept. It uses UTC time, and provides timestamps in UTC, as described in
http://xmpp.org/extensions/xep-0082.html

For example, when a user receives an old message, ejabberd adds a Delay element providing the timestamp in UTC format:

<message from='user3@localhost/tka1'
	to='user1@localhost'
	id='89:188'
	xml:lang='es'
	type='chat'>
  <body>mensaje1</body>
  <delay from='localhost'
	stamp='2015-06-16T22:40:59.988Z'
	xmlns='urn:xmpp:delay'>Offline Storage</delay>
</message>
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