I believe that you can change the ticket format. The setting is in the admin section somewhere. (There was a thread a long while back on the subject.) The format you're mentioning i do not believe will work. The format includes more than what you reference.
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-------- Original message --------
From: Alexis HAUSER <alexis.hauser@imt-atlantique.fr>
Date: 10/3/19 11:00 (GMT-05:00)
To: otrs <otrs@lists.otrs.org>
Subject: [otrs] Tickets number of digits
Hi,
Is there a way to change the number of digits used in the ticket numbers ?
For example, transform Ticket#2019041140000031 into date + 3 digits for ticket number : Ticket#20190411031