All dates look weird like if they contained non-unicode characters. For example "20 Мар" being "20 ���".
However I don't know if this is issue with Vanilla Forums themselves. 🤷♂️
Товарищи, что с датами? Они криво отображаются. 🤔
Just guessing, but check if anything changes if you add this to your conf/config.php:
$Configuration['Garden']['LocaleCodeset'] = 'UTF-8';
Some systems may need the dash.
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Unfortunately `LocaleCodeset` doesn't come in handy, but thanks. Tt looks like some sort of internal error with PHP on my local server. But if somebody encounters it in production, well, bad luck.