Hi Nikolai
I carried out the tests you described but none of the plugins seem to affect the date display problem, I will send you the site link in a private message.
thank you for the great help you are giving me.

Well, after investigation I can definitely conclude that the problem is in the wrong 'Event manager' plugin translation.

If I set the language in the User settings as English, then everything works fine.

Please open iisue or ask developers on the plugin's page

Edited: Maybe, this issue is related to some vendor's lib translation.

Hi Nikolai,

Sorry my english, please

Thanks you for the best help. I resolve this problem, editing language file with correct data format and now i see date correctly