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+'\" et
+.TH GMTIME "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH 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.
+.\"
+.SH NAME
+gmtime,
+gmtime_r
+\(em convert a time value to a broken-down UTC time
+.SH SYNOPSIS
+.LP
+.nf
+#include <time.h>
+.P
+struct tm *gmtime(const time_t *\fItimer\fP);
+struct tm *gmtime_r(const time_t *restrict \fItimer\fP,
+    struct tm *restrict \fIresult\fP);
+.fi
+.SH DESCRIPTION
+For
+\fIgmtime\fR():
+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 POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fIgmtime\fR()
+function shall convert the time in seconds since the Epoch pointed to by
+.IR timer
+into a broken-down time, expressed as Coordinated Universal Time
+(UTC).
+.P
+The relationship between a time in seconds since the Epoch used as an
+argument to
+\fIgmtime\fR()
+and the
+.BR tm
+structure (defined in the
+.IR <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 Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.16" ", " "Seconds Since the Epoch"),
+where the names in the structure and in the expression correspond.
+.P
+The same relationship shall apply for
+\fIgmtime_r\fR().
+.P
+The
+\fIgmtime\fR()
+function need not be thread-safe.
+.P
+The
+\fIasctime\fR(),
+\fIctime\fR(),
+\fIgmtime\fR(),
+and
+\fIlocaltime\fR()
+functions shall return values in one of two static objects: a
+broken-down time structure and an array of type
+.BR char .
+Execution of any of the functions may overwrite the information
+returned in either of these objects by any of the other functions.
+.P
+The
+\fIgmtime_r\fR()
+function shall convert the time in seconds since the Epoch pointed to by
+.IR timer
+into a broken-down time expressed as Coordinated Universal Time (UTC).
+The broken-down time is stored in the structure referred to by
+.IR result .
+The
+\fIgmtime_r\fR()
+function shall also return the address of the same structure.
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fIgmtime\fR()
+function shall return a pointer to a
+.BR "struct tm" .
+If an error is detected,
+\fIgmtime\fR()
+shall return a null pointer
+and set
+.IR errno
+to indicate the error.
+.P
+Upon successful completion,
+\fIgmtime_r\fR()
+shall return the address of the structure pointed to by the argument
+.IR result .
+If an error is detected,
+\fIgmtime_r\fR()
+shall return a null pointer and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIgmtime\fR()
+and
+\fIgmtime_r\fR()
+functions shall fail if:
+.TP
+.BR EOVERFLOW
+The result cannot be represented.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+The
+\fIgmtime_r\fR()
+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
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIasctime\fR\^(\|)",
+.IR "\fIclock\fR\^(\|)",
+.IR "\fIctime\fR\^(\|)",
+.IR "\fIdifftime\fR\^(\|)",
+.IR "\fIlocaltime\fR\^(\|)",
+.IR "\fImktime\fR\^(\|)",
+.IR "\fIstrftime\fR\^(\|)",
+.IR "\fIstrptime\fR\^(\|)",
+.IR "\fItime\fR\^(\|)",
+.IR "\fIutime\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.16" ", " "Seconds Since the Epoch",
+.IR "\fB<time.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .