Hello @Diego Klubok
To change the date format of date pickers you need to alter the format in the System settings, under the Look and Feel section.
Though if you are viewing the Issue via Jira's new UI the date format you have specified may not apply. In which case, I would create an Atlassian support ticket via their support page.
Hope this helps,
Hi! My name is Eoin and I'm a product manager working on Team-managed projects in Jira Software Cloud. We're continuously improving and updating Jira Software and feedback from our customers is ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events