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TZSETUP(8)               Debian Timezone Configuration              TZSETUP(8)

       tzsetup - set the local timezone

       tzsetup [-y] [-g] [-c CC] [-N]

       This  manual  page  explains how you can use the tzsetup utility to set
       the local timezone. This is necessary to let your system know about the
       difference  between  system  time  and local time (the time in the real
       world). It is also necessary to make your  system  behave  nicely  when
       your location uses Daylight Savings Time.

       A valid system time together with the correct local time zone will give
       you best performance and highest reliability. It is  especially  impor-
       tant  in  a  network environment, where even small time differences can
       make a mirror refetch a whole ftp site, or where time stamps on  exter-
       nal file systems are used.

       tzsetup  is  typically  called  without  any parameters from the shell.
       Optionally, the -y parameter can be used, to make it always change your
       time  zone  without asking first. The -g parameter can also be used, to
       make it ask if the hardware clock is set to gmt or not. The -c  parame-
       ter,  followed  by a country code, hints at the country the user's time
       zone may be in. The -N parameter allows it to run  noninteractively  if
       the debconf questions have been preseeded.

       After you made your choice, tzsetup will try to change the timezone for
       you. See the INTERNALS section below for technical  details.  You  must
       have  root  privileges  to  actually  change anything. Please use tzse-
       lect(1) as a user space command to just look at the timezones. It  will
       print the local time in any timezone recognized by the system.

       What  timezone is correct for your system? It depends on the geographi-
       cal location of the machine. Getting the correct location is important,
       but  the system must also know how your hardware clock is set. Most DOS
       based PCs set their hardware clock on Local Time, while most UNIX  sys-
       tems set their hardware clock to UTC.

       The  Debian  GNU/Linux  system gains its knowledge of this setting from
       the file /etc/default/rcS.  This file contains either the line UTC=yes,
       which  indicates  that the hardware clock is set to UTC, or it contains
       the line UTC=no, which declares the hardware  clock  is  set  to  Local
       Time. If these setting are correct, and the hardware clock is truly set
       as indicated, then configuring the proper timezone for the machine will
       cause  the  proper  date and time to be displayed. If these are not set
       correctly,  the  the  reported  time  will  be  quite  incorrect.   See
       hwclock(8) for more details on this topic.

       The work done by tzsetup is actually pretty simple. It just updates the
       link /etc/localtime to point  to  the  correct  timezone  installed  in

       There is nothing wrong with doing this manually. However, using tzsetup
       you don't have to remember the path to the timezones.

       /etc/timezone  /etc/localtime  /usr/share/zoneinfo

       This program is based on tzconfig(8) -- the only  major  difference  is
       that  this  program  uses  debconf  for its user interface, and that it
       allows configuration of GMT.

       hwclock(8) tzselect(1) rcS(5) tzconfig(8)

       Joey Hess <joeyhATdebian.org>

Debian                          16 January 2004                     TZSETUP(8)