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

NAME
       gmtime, gmtime_r - convert a time value to a broken-down UTC time

SYNOPSIS
       #include <time.h>

       struct tm *gmtime(const time_t *timer);

       struct tm *gmtime_r(const time_t *restrict timer,
	      struct tm *restrict result);

DESCRIPTION
       For  gmtime():	 The functionality described on this reference page is
       aligned with the ISO C standard. Any conflict between the  requirements
       described  here and the ISO C standard is unintentional. This volume of
       IEEE Std 1003.1-2001 defers to the ISO C standard.

       The gmtime() function shall convert the time in seconds since the Epoch
       pointed	to  by timer into a broken-down time, expressed as Coordinated
       Universal Time (UTC).

       The relationship between a time in seconds since the Epoch used	as  an
       argument	 to  gmtime()  and  the	 tm structure (defined in the <time.h>
       header) is that the result shall be  as	specified  in  the  expression
       given  in the definition of seconds since the Epoch (see the Base Defi‐
       nitions volume of IEEE Std 1003.1-2001, Section 4.14, Seconds Since the
       Epoch),	where  the names in the structure and in the expression corre‐
       spond.

       The same relationship shall apply for gmtime_r().

       The gmtime() function need not be reentrant. A  function	 that  is  not
       required to be reentrant is not required to be thread-safe.

       The  asctime(),	ctime(),  gmtime(),  and  localtime()  functions shall
       return values in one of two static objects: a broken-down  time	struc‐
       ture  and  an array of type char. Execution of any of the functions may
       overwrite the information returned in either of these objects by any of
       the other functions.

       The  gmtime_r()	function  shall	 convert the time in seconds since the
       Epoch pointed to by timer into a broken-down time expressed as  Coordi‐
       nated  Universal	 Time  (UTC).  The  broken-down	 time is stored in the
       structure referred to by result. The  gmtime_r()	 function  shall  also
       return the address of the same structure.

RETURN VALUE
       Upon  successful	 completion,  the  gmtime()  function  shall  return a
       pointer to a struct tm. If an error is detected, gmtime() shall	return
       a null pointer	 and set errno to indicate the error.

       Upon  successful completion, gmtime_r() shall return the address of the
       structure pointed to by the argument result.  If an error is  detected,
       gmtime_r() shall return a null pointer.

ERRORS
       The gmtime() function shall fail if:

       EOVERFLOW
	      The result cannot be represented.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  gmtime_r()	function  is thread-safe and returns values in a user-
       supplied buffer instead of possibly using a static data area  that  may
       be overwritten by each call.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       asctime()  ,  clock() , ctime() , difftime() , localtime() , mktime() ,
       strftime() , strptime() , time() , utime() , the Base Definitions  vol‐
       ume of IEEE Std 1003.1-2001, <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			     GMTIME(P)
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