Hello @Мочалов Илья,
@Francesc_Arbó's link will work if you're on Jira Server, but it looks like you're on Jira Cloud so you'd rather go to this link: Configuring the look and feel of your Jira applications > How to change date and time formats.
Hope this helps!
Hilda from the support service helped. I publish a working answer:
@Sander Alberink Do you see the time formats on the bottom of the "Look & Feel" page in Jira settings (https://your-instance-name.atlassian.net/secure/admin/LookAndFeel!default.jspa?)? They should be there, and changing should have immediate effect.
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