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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "CTIME" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" ctime 
+.SH NAME
+ctime, ctime_r \- convert a time value to a date and time string
+.SH SYNOPSIS
+.LP
+\fB#include <time.h>
+.br
+.sp
+char *ctime(const time_t *\fP\fIclock\fP\fB);
+.br
+\fP
+.LP
+\fBchar *ctime_r(const time_t *\fP\fIclock\fP\fB, char *\fP\fIbuf\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+For \fIctime\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 \fIctime\fP() function shall convert the time pointed to by \fIclock\fP,
+representing time in seconds since the Epoch, to
+local time in the form of a string. It shall be equivalent to:
+.sp
+.RS
+.nf
+
+\fBasctime(localtime(clock))
+\fP
+.fi
+.RE
+.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 \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 \fIctime\fP() function need not be reentrant. A function that
+is not required to be reentrant is not required to be
+thread-safe. 
+.LP
+The \fIctime_r\fP() function shall convert the calendar time pointed
+to by \fIclock\fP to local time in exactly the same form as
+\fIctime\fP() and put the string into the array pointed to by \fIbuf\fP
+(which shall be at least 26 bytes in size) and return
+\fIbuf\fP.
+.LP
+Unlike \fIctime\fP(), the thread-safe version \fIctime_r\fP() is not
+required to set \fItzname\fP. 
+.SH RETURN VALUE
+.LP
+The \fIctime\fP() function shall return the pointer returned by \fIasctime\fP()
+with
+that broken-down time as an argument.
+.LP
+Upon successful completion, \fIctime_r\fP() shall return a pointer
+to the string pointed to by \fIbuf\fP. When an error is
+encountered, a null pointer shall be returned. 
+.SH ERRORS
+.LP
+No errors are defined.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Values for the broken-down time structure can be obtained by calling
+\fIgmtime\fP() or
+\fIlocaltime\fP(). The \fIctime\fP() function is included for compatibility
+with older
+implementations, and does not support localized date and time formats.
+Applications should use the \fIstrftime\fP() function to achieve maximum
+portability.
+.LP
+The \fIctime_r\fP() function is thread-safe and shall return 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() , \fIdifftime\fP() , \fIgmtime\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 .