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Linux 2.6 - man page for daylight (linux section 3posix)

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

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 con-
       version 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 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.

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 TZSET(P)


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