1
OK I figured it out.
It was again with newbb/include/functions.php
I edited
From this:
To this
It was again with newbb/include/functions.php
I edited
From this:
function newbb_formatTimestamp($time, $format="c", $timeoffset="")
To this
function newbb_formatTimestamp($time, $format="j M Y H:i:s a", $timeoffset="-8")