1 ## Copyright (C) 2000-2012 Paul Kienzle
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {t =} now ()
21 ## Return the current local date/time as a serial day number
22 ## (see @code{datenum}).
24 ## The integral part, @code{floor (now)} corresponds to the number of days
25 ## between today and Jan 1, 0000.
27 ## The fractional part, @code{rem (now, 1)} corresponds to the current
29 ## @seealso{clock, date, datenum}
32 ## Author: pkienzle <pkienzle@users.sf.net>
33 ## Created: 10 October 2001 (CVS)
34 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
42 t = datenum (clock ());
44 ## The following doesn't work (e.g., one hour off on 2005-10-04):
46 ## seconds since 1970-1-1 corrected by seconds from GMT to local time
47 ## divided by 86400 sec/day plus day num for 1970-1-1
48 ## t = (time - mktime(gmtime(0)))/86400 + 719529;
50 ## mktime(gmtime(0)) does indeed return the offset from Greenwich to the
51 ## local time zone, but we need to account for daylight savings time
52 ## changing by an hour the offset from CUT for part of the year.
57 %!assert (isnumeric (now ()));
58 %!assert (now () > 0);
59 %!assert (now () <= now ());