230 lines
6.6 KiB
Groff
230 lines
6.6 KiB
Groff
.\" Based on the UCB file whose copyright information appears below.
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.\" Copyright (c) 1989, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)strftime.3 5.12 (Berkeley) 6/29/91
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.\" $Id: strftime.3,v 1.4 1993/12/15 20:33:00 jtc Exp $
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.\"
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.TH NEWSTRFTIME 3
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.SH NAME
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strftime \- format date and time
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.SH SYNOPSIS
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.nf
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.B #include <sys/types.h>
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.B #include <time.h>
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.PP
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.B size_t strftime(buf, maxsize, format, timeptr)
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.B char *buf;
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.B size_t maxsize;
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.B const char *format;
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.B const struct tm *timeptr
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.PP
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.B cc ... -ltz
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.fi
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.SH DESCRIPTION
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The
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.I strftime\^
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function formats the information from
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.I timeptr\^
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into the buffer
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.I buf\^
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according to the string pointed to by
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.IR format\^ .
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.PP
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The
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.I format\^
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string consists of zero or more conversion specifications and
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ordinary characters.
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All ordinary characters are copied directly into the buffer.
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A conversion specification consists of a percent sign
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.Ql %
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and one other character.
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.PP
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No more than
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.I maxsize\^
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characters are be placed into the array.
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If the total number of resulting characters, including the terminating
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null character, is not more than
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.IR maxsize\^ ,
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.I strftime\^
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returns the number of characters in the array, not counting the
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terminating null.
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Otherwise, zero is returned.
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.PP
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Each conversion specification is replaced by the characters as
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follows which are then copied into the buffer.
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.TP
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%A
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is replaced by the locale's full weekday name.
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.TP
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%a
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is replaced by the locale's abbreviated weekday name.
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.TP
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%B
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is replaced by the locale's full month name.
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.TP
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%b or %h
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is replaced by the locale's abbreviated month name.
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.TP
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%C
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is replaced by the century (a year divided by 100 and truncated to an integer)
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as a decimal number (00-99).
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.TP
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%c
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is replaced by the locale's appropriate date and time representation.
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.TP
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%D
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is replaced by the date in the format %m/%d/%y.
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.TP
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%d
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is replaced by the day of the month as a decimal number (01-31).
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.TP
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%e
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is replaced by the day of month as a decimal number (1-31);
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single digits are preceded by a blank.
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.TP
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%F
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is replaced by the date in the format %Y-%m-%d.
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.TP
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%G
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is replaced by the ISO 8601 year with century as a decimal number.
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.TP
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%g
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is replaced by the ISO 8601 year without century as a decimal number (00-99).
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.TP
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%H
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is replaced by the hour (24-hour clock) as a decimal number (00-23).
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.TP
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%I
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is replaced by the hour (12-hour clock) as a decimal number (01-12).
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.TP
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%j
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is replaced by the day of the year as a decimal number (001-366).
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.TP
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%k
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is replaced by the hour (24-hour clock) as a decimal number (0-23);
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single digits are preceded by a blank.
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.TP
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%l
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is replaced by the hour (12-hour clock) as a decimal number (1-12);
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single digits are preceded by a blank.
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.TP
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%M
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is replaced by the minute as a decimal number (00-59).
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.TP
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%m
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is replaced by the month as a decimal number (01-12).
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.TP
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%n
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is replaced by a newline.
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.TP
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%p
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is replaced by the locale's equivalent of either AM or PM.
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.TP
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%R
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is replaced by the time in the format %H:%M.
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.TP
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%r
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is replaced by the locale's representation of 12-hour clock time
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using AM/PM notation.
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.TP
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%S
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is replaced by the second as a decimal number (00-60).
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.TP
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%s
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is replaced by the number of seconds since the Epoch, UTC (see mktime(3)).
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.TP
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%T
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is replaced by the time in the format %H:%M:%S.
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.TP
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%t
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is replaced by a tab.
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.TP
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%U
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is replaced by the week number of the year (Sunday as the first day of
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the week) as a decimal number (00-53).
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.TP
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%u
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is replaced by the weekday (Monday as the first day of the week)
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as a decimal number (1-7).
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.TP
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%V
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is replaced by the week number of the year (Monday as the first day of
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the week) as a decimal number (01-53). If the week containing January
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1 has four or more days in the new year, then it is week 1; otherwise
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it is week 53 of the previous year, and the next week is week 1.
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.TP
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%W
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is replaced by the week number of the year (Monday as the first day of
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the week) as a decimal number (00-53).
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.TP
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%w
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is replaced by the weekday (Sunday as the first day of the week)
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as a decimal number (0-6).
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.TP
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%X
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is replaced by the locale's appropriate time representation.
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.TP
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%x
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is replaced by the locale's appropriate date representation.
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.TP
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%Y
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is replaced by the year with century as a decimal number.
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.TP
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%y
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is replaced by the year without century as a decimal number (00-99).
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.TP
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%Z
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is replaced by the time zone name,
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or by the empty string if this is not determinable.
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.TP
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%z
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is replaced by the offset from UTC in the format +HHMM or -HHMM as appropriate,
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with positive values representing locations east of Greenwich,
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or by the empty string if this is not determinable.
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.TP
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%%
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is replaced by a single %.
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.TP
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%+
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is replaced by the date and time in date(1) format.
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.SH SEE ALSO
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date(1),
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getenv(3),
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newctime(3),
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newtzset(3),
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time(2),
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tzfile(5)
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.\" @(#)newstrftime.3 7.15
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