Impossible to create tournament

Hello,
when i try to create a tournament i get this error: https://prnt.sc/l0g9bv

Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (30/09/2019 13:11) at position 0 (3): Unexpected character in C:\xampp\htdocs\tour\wp-content\themes\arcane\tmp-tournament-single.php:204 Stack trace: #0 C:\xampp\htdocs\tour\wp-content\themes\arcane\tmp-tournament-single.php(204): DateTime->__construct('30/09/2019 13:1...', Object(DateTimeZone)) #1 C:\xampp\htdocs\tour\wp-includes\template-loader.php(74): include('C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\tour\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...') #3 C:\xampp\htdocs\tour\index.php(17): require('C:\\xampp\\htdocs...') #4 {main} thrown in C:\xampp\htdocs\tour\wp-content\themes\arcane\tmp-tournament-single.php on line 204

I’ve already found solutions online, but nothing worked. PHP.ini has already a timezone set and i also have changed date format and language but still not working.