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settz(3)
NAME
  settz - Set system time zone information.

SYNOPSIS
  settz

DESCRIPTION
  The settz command sets the system time zone information, based on the
  current zoneinfo database configuration.  If the zoneinfo database is not
  configured, it sets the system time information as if the zoneinfo database
  were configured to default to Coordinated Universal Time (UTC).

  Specifically, it calls tzset() to get current default time zone
  information, ignoring the TZ environment variable, if set, creates a struct
  timezone with time zone offset, and daylight savings information, then
  calls settimeofday().	 The current system date and time are not changed.

  This command is always run the system is entering a multiuser run level and
  should be run whenever default time zone information has been changed by
  the zic command.

NOTES
  You must have superuser privileges to use this command.

RELATED INFORMATION
  Commands: timezone(3), tzset(3), timezone(8), zic(8)