ejabberd time

Hi I set time to xmpp message on ejabberd, but I don't know that message from users send, will taged timestamp tags in order send in ejabberd servers?

Is it possible users sent messages 1(1ms) 2(2ms) 3(3ms) 4(4ms) and ejabberd server taged 3(1ms) 2(2ms) 1(3ms) 4(ms)?
I use user_send_packet hook.
thanks alot

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