4.3BSD-Reno/src/lib/libc/string/strftime.3

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.\" Copyright (c) 1989 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted provided
.\" that: (1) source distributions retain this entire copyright notice and
.\" comment, and (2) distributions including binaries display the following
.\" acknowledgement:  ``This product includes software developed by the
.\" University of California, Berkeley and its contributors'' in the
.\" documentation or other materials provided with the distribution and in
.\" all advertising materials mentioning features or use of this software.
.\" Neither the name of the University nor the names of its contributors may
.\" be used to endorse or promote products derived from this software without
.\" specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"	@(#)strftime.3	5.6 (Berkeley) 6/23/90
.\"
.TH STRFTIME 3 "%Q"
.AT 3
.SH NAME
strftime \- format date and time
.SH SYNOPSIS
.nf
.ft B
#include <sys/types.h>
#include <time.h>
#include <string.h>

size_t
strftime(char *s, size_t maxsize, const char *format,
	const struct tm *timeptr);
.ft R
.fi
.SH DESCRIPTION
The
.I strftime
function formats the information from
.I timeptr
into the buffer
.I buf
according to the string pointed to by
.IR format .
.PP
The
.I format
string consists of zero or more conversion specifications and
ordinary characters.
All ordinary characters are copied directly into the buffer.
A conversion specification consists of a percent sign (``%'')
and one other character.
.PP
No more than
.I maxsize
characters will be placed into the array.
If the total number of resulting characters, including the terminating
null character, is not more than
.IR maxsize ,
.I strftime
returns the number of characters in the array, not counting the
terminating null.
Otherwise, zero is returned.
.PP
Each conversion specification is replaced by the characters as
follows which are then copied into the buffer.
.TP
.B %A
is replaced by the full weekday name.
.TP
.B %a
is replaced by the abbreviated weekday name, where the abbreviation
is the first three characters.
.TP
.B %B
is replaced by the full month name.
.TP
.B %b or %h
is replaced by the abbreviated month name, where the abbreviation is
the first three characters.
.TP
.B %C
is equivalent to ``%a %b %e %H:%M:%S %Y'' (the format produced by
.IR asctime (3).
.TP
.B %c
is equivalent to ``%m/%d/%y''.
.TP
.B %D
is replaced by the date in the format ``mm/dd/yy''.
.TP
.B %d
is replaced by the day of the month as a decimal number (01-31).
.TP
.B %e
is replaced by the day of month as a decimal number (1-31); single
digits are preceded by a blank.
.TP
.B %H
is replaced by the hour (24-hour clock) as a decimal number (00-23).
.TP
.B %I
is replaced by the hour (12-hour clock) as a decimal number (01-12).
.TP
.B %j
is replaced by the day of the year as a decimal number (001-366).
.TP
.B %k
is replaced by the hour (24-hour clock) as a decimal number (0-23);
single digits are preceded by a blank.
.TP
.B %l
is replaced by the hour (12-hour clock) as a decimal number (01-12);
single digits are preceded by a blank.
.TP
.B %M
is replaced by the minute as a decimal number (00-59).
.TP
.B %m
is replaced by the month as a decimal number (01-12).
.TP
.B %n
is replaced by a newline.
.TP
.B %p
is replaced by either ``AM'' or ``PM'' as appropriate.
.TP
.B %R
is equivalent to ``%H:%M''.
.TP
.B %r
is equivalent to ``%I:%M:%S %p''.
.TP
.B %t
is replaced by a tab.
.TP
.B %S
is replaced by the second as a decimal number (00-60).
.TP
.B %T or %X
is equivalent to ``%H:%M:%S''.
.TP
.B %U
is replaced by the week number of the year (Sunday as the first day of
the week) as a decimal number (00-53).
.TP
.B %W
is replaced by the week number of the year (Monday as the first day of
the week) as a decimal number (00-53).
.TP
.B %w
is replaced by the weekday (Sunday as the first day of the week)
as a decimal number (0-6).
.TP
.B %x
is equivalent to ``%m/%d/%y %H:%M:%S''.
.TP
.B %Y
is replaced by the year with century as a decimal number.
.TP
.B %y
is replaced by the year without century as a decimal number (00-99).
.TP
.B %Z
is replaced by the time zone name.
.TP
.B %%
is replaced by ``%''.
.SH "SEE ALSO"
date(1), ctime(3), printf(1), printf(3)
.SH STANDARDS
.B Strftime
conforms to ANSI X3.159-1989 (``ANSI C'').