Today I had the same phenomenon as reported by "mannheim": The timezone
changed from "CEST" to "CET", but the time itself did not change. The
result was an incorrect time +1h in the future.

The system (7.04) was shutdown during the transition point (no suspend, no 
hibernate).
I have ntp, ntpdate and tzdata installed, and ntpd is launched at startup, 
using:
server ntp.ubuntu.com minpoll 12 maxpoll 17

$ zdump -v /etc/localtime | grep 2007
/etc/localtime  Sun Mar 25 00:59:59 2007 UTC = Sun Mar 25 01:59:59 2007 CET 
isdst=0 gmtoff=3600
/etc/localtime  Sun Mar 25 01:00:00 2007 UTC = Sun Mar 25 03:00:00 2007 CEST 
isdst=1 gmtoff=7200
/etc/localtime  Sun Oct 28 00:59:59 2007 UTC = Sun Oct 28 02:59:59 2007 CEST 
isdst=1 gmtoff=7200
/etc/localtime  Sun Oct 28 01:00:00 2007 UTC = Sun Oct 28 02:00:00 2007 CET 
isdst=0 gmtoff=3600
$ dpkg -l|grep ntp
ii  ntp                                        4.2.2.p4+dfsg-1ubuntu3           
          Network Time Protocol daemon and utility pro
ii  ntp-simple                                 4.2.2.p4+dfsg-1ubuntu3           
          transition package
ii  ntpdate                                    4.2.2.p4+dfsg-1ubuntu3           
          client for setting system time from NTP serv
$ dpkg -l|grep tz
ii  tzdata                                     2007f-0ubuntu0.7.4               
          Time Zone and Daylight Saving Time Data
$ date
Sun Oct 28 19:20:25 CET 2007
$ sudo /etc/init.d/ntp stop 
 * Stopping NTP server ntpd                                                     
                                 [ OK ]
$ sudo /usr/sbin/ntpdate ntp.ubuntu.com
28 Oct 18:20:53 ntpdate[7169]: step time server 91.189.94.4 offset -3609.986278 
sec
$ date
Sun Oct 28 18:20:56 CET 2007

On a friend's machine, also running 7.04, the transition worked fine. However, 
there are at least two differences:
- His machine is running 24/7
- ntpd is not running, ntp is not installed. ntpdate and tzdata are installed.

-- 
Time not updated when daylight savings switch made
https://bugs.launchpad.net/bugs/91418
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