1.152 How do I set the TZ variable to automatically change to daylight savings time?

The TZ variable can be set in /etc/environment file so the time
automatically switches to daylight savings time in spring and back to
normal in autumn. The actual rules when to switch vary by country, the
following should work in middle europe:

TZ=MET-1MET DST,M3.5.0/02:00:00,M10.5.0/03:00:00

The exact definition for the rules can be found with infoexplorer under
the environment page.