Hi @asmecher,
Since I am not a programmer and developer, I am not sure about the origin of this issue, but I feel that it might be related to the php bug related to Turkish locale. We had solved this issue with your suggestions, and the solution was to set the locale to English while using Turkish language.
“Failed Ajax request or invalid JSON returned” errors on Turkish backend
if ($locale == 'tr_TR') setlocale(LC_CTYPE, 'en_US');
So, I will go on using original date-time format, and follow the forum.
Regards,
Ugur Kocak