Search results on Special:Search displays time of last edit using UTC, at least on Commons where I have different user preferences, and logged-out on sv.wikipedia which otherwise uses CET.
I think this time should be displayed using user preferred time. That will make it consistent with the same time displayed at the bottom of articles and in page histories.
I think it should be easy to fix by changing line 649 of SpecialSearch.php from:
$date = $lang->timeanddate( $timestamp );
$date = $lang->timeanddate( $timestamp, true );