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           #include <time.h>
           void tzset (void);
           extern char *tzname[2];
           extern long timezone;
           extern int daylight;
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
           tzset(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
           tzname: _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
           timezone: _SVID_SOURCE || _XOPEN_SOURCE
           daylight: _SVID_SOURCE || _XOPEN_SOURCE


           The tzset() function initializes the tzname variable from the TZ  envi-
           ronment  variable.   This function is automatically called by the other
           time conversion functions that depend on the timezone.  In a  System-V-
           like environment, it will also set the variables timezone (seconds West
           of UTC) and daylight (to 0 if this timezone does not have any  daylight
           saving  time  rules,  or  to nonzero if there is a time during the year
           when daylight saving time applies).
           If the TZ variable does not appear in the environment, the tzname vari-
           able  is  initialized  with  the best approximation of local wall clock
           time, as specified by the tzfile(5)-format file localtime found in  the
           system   timezone   directory   (see  below).   (One  also  often  sees
           /etc/localtime used here, a symlink to the right  file  in  the  system
           timezone directory.)
           If  the  TZ  variable  does  appear in the environment but its value is
           empty or its value cannot be interpreted using any of the formats spec-
           ified below, Coordinated Universal Time (UTC) is used.
           The  value of TZ can be one of three formats.  The first format is used
           when there is no daylight saving time in the local timezone:
                  std offset
           The std string specifies the name of the timezone and must be three  or
           more  alphabetic characters.  The offset string immediately follows std
           and specifies the time value to be added to the local time to get Coor-
           dinated  Universal  Time  (UTC).   The  offset is positive if the local
           timezone is west of the Prime Meridian and negative if it is east.  The
           hour must be between 0 and 24, and the minutes and seconds 0 and 59.
           The second format is used when there is daylight saving time:
                  std offset dst [offset],start[/time],end[/time]
           n      This  specifies  the  zero-based Julian day with n between 0 and
                  365.  February 29 is counted in leap years.
           Mm.w.d This specifies day d (0 <= d <= 6) of week w (1 <= w  <=  5)  of
                  month m (1 <= m <= 12).  Week 1 is the first week in which day d
                  occurs and week 5 is the last week in which day d occurs.  Day 0
                  is a Sunday.
           The  time  fields  specify when, in the local time currently in effect,
           the change to the other  time  occurs.   If  omitted,  the  default  is
           Here  is  an example for New Zealand, where the standard time (NZST) is
           12 hours ahead of UTC, and daylight saving time (NZDT), 13 hours  ahead
           of  UTC,  runs  from the first Sunday in October to the third Sunday in
           March, and the changeovers happen at the default time of 02:00:00:
           The third format specifies that the timezone information should be read
           from a file:
           If the file specification filespec is omitted, the timezone information
           is read from the file localtime in the system timezone directory, which
           nowadays  usually  is  /usr/share/zoneinfo.   This file is in tzfile(5)
           format.  If filespec is given, it  specifies  another  tzfile(5)-format
           file to read the timezone information from.  If filespec does not begin
           with a '/', the file specification is relative to the  system  timezone
           Here's an example, once more for New Zealand:


           The  system  timezone  directory  used  depends on the (g)libc version.
           Libc4 and libc5 use /usr/lib/zoneinfo, and, since libc-5.4.6, when this
           doesn't  work, will try /usr/share/zoneinfo.  Glibc2 will use the envi-
           ronment variable TZDIR, when that exists.  Its default depends  on  how
           it was installed, but normally is /usr/share/zoneinfo.
           This timezone directory contains the files
           localtime      local timezone file
           posixrules     rules for POSIX-style TZ's
           Often  /etc/localtime is a symlink to the file localtime or to the cor-
           rect timezone file in the system timezone directory.


           date(1), gettimeofday(2), time(2), ctime(3), getenv(3), tzfile(5)
                                      2012-03-25                          TZSET(3)

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