xref: /csrg-svn/lib/libc/string/strftime.3 (revision 48351)

.\" Copyright (c) 1989, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" %sccs.include.redist.man%
.\"
.\"     @(#)strftime.3	5.11 (Berkeley) 04/19/91
.\"
.Dd
.Dt STRFTIME 3
.Os
.Sh NAME
.Nm strftime
.Nd format date and time
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <time.h>
.Fd #include <string.h>
.Ft size_t
.Fn strftime "char *buf" "size_t maxsize" "const char *format" "const struct tm *timeptr"
.Sh DESCRIPTION
The
.Fn strftime
function formats the information from
.Fa timeptr
into the buffer
.Fa buf
according to the string pointed to by
.Fa format .
.Pp
The
.Fa 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
.Dq Ql %
and one other character.
.Pp
No more than
.Fa maxsize
characters will be placed into the array.
If the total number of resulting characters, including the terminating
null character, is not more than
.Fa maxsize ,
.Fn 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.
.Bl -tag -width "xxxx"
.It Cm \&%A
is replaced by the full weekday name.
.It Cm %a
is replaced by the abbreviated weekday name, where the abbreviation
is the first three characters.
.It Cm \&%B
is replaced by the full month name.
.It Cm %b  or  %h
is replaced by the abbreviated month name, where the abbreviation is
the first three characters.
.It Cm \&%C
is equivalent to
.Dq Li %a %b %e %H:%M:%S %Y
(the format produced by
.Xr asctime 3 .
.It Cm %c
is equivalent to
.Dq Li %m/%d/%y .
.It Cm \&%D
is replaced by the date in the format
.Dq Ql mm/dd/yy .
.It Cm %d
is replaced by the day of the month as a decimal number (01-31).
.It Cm %e
is replaced by the day of month as a decimal number (1-31); single
digits are preceded by a blank.
.It Cm \&%H
is replaced by the hour (24-hour clock) as a decimal number (00-23).
.It Cm \&%I
is replaced by the hour (12-hour clock) as a decimal number (01-12).
.It Cm %j
is replaced by the day of the year as a decimal number (001-366).
.It Cm %k
is replaced by the hour (24-hour clock) as a decimal number (0-23);
single digits are preceded by a blank.
.It Cm %l
is replaced by the hour (12-hour clock) as a decimal number (1-12);
single digits are preceded by a blank.
.It Cm \&%M
is replaced by the minute as a decimal number (00-59).
.It Cm %m
is replaced by the month as a decimal number (01-12).
.It Cm %n
is replaced by a newline.
.It Cm %p
is replaced by either
.Dq Tn AM
or
.Dq Tn PM
as appropriate.
.It Cm \&%R
is equivalent to
.Dq Li %H:%M
.It Cm %r
is equivalent to
.Dq Li %I:%M:%S %p .
.It Cm %t
is replaced by a tab.
.It Cm \&%S
is replaced by the second as a decimal number (00-60).
.It Cm %s
is replaced by the number of seconds since the Epoch, UCT (see
.Xr mktime 3 ) .
.It Cm \&%T No or Cm \&%X
is equivalent to
.Dq Li %H:%M:%S .
.It Cm \&%U
is replaced by the week number of the year (Sunday as the first day of
the week) as a decimal number (00-53).
.It Cm \&%W
is replaced by the week number of the year (Monday as the first day of
the week) as a decimal number (00-53).
.It Cm %w
is replaced by the weekday (Sunday as the first day of the week)
as a decimal number (0-6).
.It Cm %x
is equivalent to
.Dq Li %m/%d/%y %H:%M:%S .
.It Cm \&%Y
is replaced by the year with century as a decimal number.
.It Cm %y
is replaced by the year without century as a decimal number (00-99).
.It Cm \&%Z
is replaced by the time zone name.
.It Cm %%
is replaced by
.Ql % .
.El
.Sh SEE ALSO
.Xr date 1 ,
.Xr ctime 3 ,
.Xr printf 1 ,
.Xr printf 3
.Sh STANDARDS
The
.Fn strftime
function
conforms to
.St -ansiC .
The
.Ql %s
conversion specification is an extension.
.Sh BUGS
There is no conversion specification for the phase of the moon.