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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "GMTIME" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" gmtime 
+.SH NAME
+gmtime, gmtime_r \- convert a time value to a broken-down UTC time
+.SH SYNOPSIS
+.LP
+\fB#include <time.h>
+.br
+.sp
+struct tm *gmtime(const time_t *\fP\fItimer\fP\fB);
+.br
+\fP
+.LP
+\fBstruct tm *gmtime_r(const time_t *restrict\fP \fItimer\fP\fB,
+.br
+\ \ \ \ \ \  struct tm *restrict\fP \fIresult\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+For \fIgmtime\fP():   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. 
+.LP
+The \fIgmtime\fP() function shall convert the time in seconds since
+the Epoch pointed to by \fItimer\fP into a broken-down
+time, expressed as Coordinated Universal Time (UTC).
+.LP
+The
+relationship between a time in seconds since the Epoch used as an
+argument to \fIgmtime\fP() and the \fBtm\fP structure (defined
+in the \fI<time.h>\fP header) is that the result shall be as specified
+in the
+expression given in the definition of seconds since the Epoch (see
+the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+Section 4.14, Seconds Since the Epoch), where the names in the structure
+and in
+the expression correspond. 
+.LP
+The same relationship shall apply for \fIgmtime_r\fP(). 
+.LP
+The
+\fIgmtime\fP() function need not be reentrant. A function that is
+not required to be reentrant is not required to be
+thread-safe.
+.LP
+The \fIasctime\fP(), \fIctime\fP(),
+\fIgmtime\fP(), and \fIlocaltime\fP() functions shall return values
+in one of two
+static objects: a broken-down time structure and an array of type
+\fBchar\fP. Execution of any of the functions may overwrite the
+information returned in either of these objects by any of the other
+functions. 
+.LP
+The \fIgmtime_r\fP() function shall convert the time in seconds since
+the Epoch pointed to by \fItimer\fP into a broken-down time
+expressed as Coordinated Universal Time (UTC). The broken-down time
+is stored in the structure referred to by \fIresult\fP. The
+\fIgmtime_r\fP() function shall also return the address of the same
+structure. 
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIgmtime\fP() function shall return
+a pointer to a \fBstruct tm\fP. If an error is detected,
+\fIgmtime\fP() shall return a null pointer   \ and set \fIerrno\fP
+to indicate the error. 
+.LP
+Upon successful completion, \fIgmtime_r\fP() shall return the address
+of the structure pointed to by the argument \fIresult\fP.
+If an error is detected, \fIgmtime_r\fP() shall return a null pointer.
+.SH ERRORS
+.LP
+The \fIgmtime\fP() function shall fail if:
+.TP 7
+.B EOVERFLOW
+The result cannot be represented. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIgmtime_r\fP() 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.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIasctime\fP() , \fIclock\fP() , \fIctime\fP()
+, \fIdifftime\fP() , \fIlocaltime\fP() , \fImktime\fP() , \fIstrftime\fP()
+, \fIstrptime\fP() ,
+\fItime\fP() , \fIutime\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<time.h>\fP
+.SH 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 .