Unfortunately I live in the UK, where 6 months of the year, the time
is GMT. Now is the time of year when I discover which of my servers don’t
have the right timezone configuration and show the wrong time during
daylight saving. For future reference, here’s how
to set the timezone to Europe/London rather than UTC.
root@cms01:/tmp/openssl-0.9.8g# date Mon Mar 31 08:23:35 GMT 2008 root@cms01:/tmp/openssl-0.9.8g# tzconfig Your current time zone is set to GMT Do you want to change that? [n]: y Please enter the number of the geographic area in which you live: 1) Africa 7) Australia 2) America 8) Europe 3) US time zones 9) Indian Ocean 4) Canada time zones 10) Pacific Ocean 5) Asia 11) Use System V style time zones 6) Atlantic Ocean 12) None of the above Then you will be shown a list of cities which represent the time zone in which they are located. You should choose a city in your time zone. Number: 8 Amsterdam Andorra Athens Belfast Belgrade Berlin Bratislava Brussels Bucharest Budapest Chisinau Copenhagen Dublin Gibraltar Guernsey Helsinki Isle_of_Man Istanbul Jersey Kaliningrad Kiev Lisbon Ljubljana London Luxembourg Madrid Malta Mariehamn Minsk Monaco Moscow Nicosia Oslo Paris Podgorica Prague Riga Rome Samara San_Marino Sarajevo Simferopol Skopje Sofia Stockholm Tallinn Tirane Tiraspol Uzhgorod Vaduz Vatican Vienna Vilnius Volgograd Warsaw Zagreb Zaporozhye Zurich Please enter the name of one of these cities or zones You just need to type enough letters to resolve ambiguities Press Enter to view all of them again Name:  London Your default time zone is set to 'Europe/London'. Local time is now: Mon Mar 31 09:23:48 BST 2008. Universal Time is now: Mon Mar 31 08:23:48 UTC 2008.
More information is available in the Debian
System Administrator Manual.