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

PROLOG
       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.

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

SYNOPSIS
       #include <time.h>

       extern int daylight;
       extern long timezone;

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

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

       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  Savings  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 Univerā€
       sal Time (UTC) and local standard time.

RETURN VALUE
       The tzset() function shall not return a value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       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

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

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

COPYRIGHT
       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 original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      TZSET(P)
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