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TZSET(3P)			    POSIX Programmer's Manual				TZSET(3P)

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

       daylight, timezone, tzname, tzset - set timezone conversion information

       #include <time.h>

       extern int daylight;
       extern long timezone;

       extern char *tzname[2];
       void tzset(void);

       The  tzset()  function shall use the value of the environment variable TZ to set time con-
       version information used by ctime(), localtime(), mktime(), and	strftime()  .  If  TZ  is
       absent  from the environment, implementation-defined default timezone information shall be

       The tzset() function shall set the external variable tzname as follows:

	      tzname[0] = "std";
	      tzname[1] = "dst";

       where std and dst are as described in the Base Definitions volume of IEEE Std 1003.1-2001,
       Chapter 8, Environment Variables.

       The  tzset()  function also shall set the external variable daylight to 0 if Daylight Sav-
       ings Time conversions should never be applied for the timezone  in  use;  otherwise,  non-
       zero.  The  external variable timezone shall be set to the difference, in seconds, between
       Coordinated Universal Time (UTC) and local standard time.

       The tzset() function shall not return a value.

       No errors are defined.

       The following sections are informative.

       Example TZ variables and their timezone differences are given in the table below:

					  TZ	      timezone
					  EST5EDT     5*60*60
					  GMT0	      0*60*60
					  JST-9       -9*60*60
					  MET-1MEST   -1*60*60
					  MST7MDT     7*60*60
					  PST8PDT     8*60*60




       ctime(),   localtime(),	 mktime(),   strftime(),   the	 Base	Definitions   volume   of
       IEEE Std 1003.1-2001, Chapter 8, Environment Variables, <time.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					TZSET(3P)
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