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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents a2902024bc4e
children a1dbe9d80eee
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1 ## Copyright (C) 2000, 2001, 2003, 2005 Paul Kienzle
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {t =} now ()
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21 ## Returns the current local time as the number of days since Jan 1, 0000.
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22 ## By this reckoning, Jan 1, 1970 is day number 719529.
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23 ##
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24 ## The integral part, @code{floor (now)} corresponds to 00:00:00 today.
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25 ##
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26 ## The fractional part, @code{rem (now, 1)} corresponds to the current
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27 ## time on Jan 1, 0000.
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28 ##
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29 ## The returned value is also called a "serial date number"
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30 ## (see @code{datenum}).
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31 ## @seealso{clock, date, datenum}
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32 ## @end deftypefn
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33
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34 ## Author: pkienzle <pkienzle@users.sf.net>
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35 ## Created: 10 October 2001 (CVS)
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36 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
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37
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38 function t = now ()
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39
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40 t = datenum (clock ());
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41
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42 ## The following doesn't work (e.g., one hour off on 2005-10-04):
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43 ##
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44 ## seconds since 1970-1-1 corrected by seconds from GMT to local time
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45 ## divided by 86400 sec/day plus day num for 1970-1-1
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46 ## t = (time - mktime(gmtime(0)))/86400 + 719529;
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47 ##
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48 ## mktime(gmtime(0)) does indeed return the offset from Greenwich to the
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49 ## local time zone, but we need to account for daylight savings time
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50 ## changing by an hour the offset from CUT for part of the year.
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51
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52 endfunction