I use the birdtips theme and it formats the post date as
$birdtips_posted = date(__('Y. F j.', 'birdtips'), strtotime(get_the_time("Y-m-d")));
where Y. F j. is already rewritten to reflect my language. As far as I understand, __ is the translation function, but how can I tell Wordpress that I use Hungarian, and will it translate month names automatically, or I should give the names in a .po file?