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  • The link in my answer (to the GNU libc TZ-Variable page) states: ...The offset specifies the time value one must add to the local time to get a Coordinated Universal Time value. ... This is positive if the local time zone is west of the Prime Meridian and negative if it is east.
    – njd
    Commented Feb 16, 2010 at 9:50
  • Agreed. The page says also that if nothing is specified for the summer time, 1 hour ahead of standard is assumed. CET-1CEST must be enough (if the OS deals with the switching dates).
    – Gauthier
    Commented Feb 16, 2010 at 12:47