Mercurial > octave-antonio

annotate scripts/time/now.m @ 5687:a2902024bc4e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[project @ 2006-03-16 20:22:40 by jwe]
author jwe
date Thu, 16 Mar 2006 20:22:41 +0000
parents
children 93c65f2a5668
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5687
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
1 ## Copyright (C) 2000, 2001, 2003, 2005 Paul Kienzle
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
2 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
3 ## This file is part of Octave.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
4 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
5 ## Octave is free software; you can redistribute it and/or modify it
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
6 ## under the terms of the GNU General Public License as published by
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
7 ## the Free Software Foundation; either version 2, or (at your option)
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
8 ## any later version.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
9 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
10 ## Octave is distributed in the hope that it will be useful, but
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
13 ## General Public License for more details.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
14 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
15 ## You should have received a copy of the GNU General Public License
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
16 ## along with Octave; see the file COPYING. If not, write to the Free
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
18 ## 02110-1301, USA.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
19
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
20 ## -*- texinfo -*-
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
21 ## @deftypefn {Function File} {t =} now ()
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
22 ## Returns the current local time as the number of days since Jan 1, 0000.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
23 ## By this reckoning, Jan 1, 1970 is day number 719529.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
24 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
25 ## The integral part, @code{floor (now)} corresponds to 00:00:00 today.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
26 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
27 ## The fractional part, @code{rem (now, 1)} corresponds to the current
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
28 ## time on Jan 1, 0000.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
29 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
30 ## The returned value is also called a "serial date number"
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
31 ## (see @code{datenum}).
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
32 ## @seealso{clock, date, datenum}
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
33 ## @end deftypefn
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
34
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
35 ## Author: pkienzle <pkienzle@users.sf.net>
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
36 ## Created: 10 October 2001 (CVS)
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
37 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
38
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
39 function t = now ()
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
40
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
41 t = datenum (clock ());
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
42
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
43 ## The following doesn't work (e.g., one hour off on 2005-10-04):
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
44 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
45 ## seconds since 1970-1-1 corrected by seconds from GMT to local time
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
46 ## divided by 86400 sec/day plus day num for 1970-1-1
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
47 ## t = (time - mktime(gmtime(0)))/86400 + 719529;
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
48 ##
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
49 ## mktime(gmtime(0)) does indeed return the offset from Greenwich to the
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
50 ## local time zone, but we need to account for daylight savings time
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
51 ## changing by an hour the offset from CUT for part of the year.
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
52
a2902024bc4e [project @ 2006-03-16 20:22:40 by jwe]
jwe
parents:
diff changeset
53 endfunction