How do I set the timezone for my MediaWiki?
There are two timezone-related settings: $wgLocaltimezone and $wgLocalTZoffset. Set both in LocalSettings.php. $wgLocaltimezone is used for formatting the timezone in signatures, and should be set to the locale name, for example “Europe/Berlin”. $wgLocalTZoffset sets the default user preference the number of hours your local time differs from server time, and is used for timestamps seen in recent changes and history views. $wgLocalTZoffset should be set in minutes, for example, “-480” equals 8 hours behind the server time.