Mercurial > hg > octave-jordi
comparison scripts/time/now.m @ 5687:a2902024bc4e
[project @ 2006-03-16 20:22:40 by jwe]
| author | jwe |
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| date | Thu, 16 Mar 2006 20:22:41 +0000 |
| parents | |
| children | 93c65f2a5668 |
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| 5686:e7790bb14cfc | 5687:a2902024bc4e |
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| 1 ## Copyright (C) 2000, 2001, 2003, 2005 Paul Kienzle | |
| 2 ## | |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 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 2, or (at your option) | |
| 8 ## any later version. | |
| 9 ## | |
| 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. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, write to the Free | |
| 17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
| 18 ## 02110-1301, USA. | |
| 19 | |
| 20 ## -*- texinfo -*- | |
| 21 ## @deftypefn {Function File} {t =} now () | |
| 22 ## Returns the current local time as the number of days since Jan 1, 0000. | |
| 23 ## By this reckoning, Jan 1, 1970 is day number 719529. | |
| 24 ## | |
| 25 ## The integral part, @code{floor (now)} corresponds to 00:00:00 today. | |
| 26 ## | |
| 27 ## The fractional part, @code{rem (now, 1)} corresponds to the current | |
| 28 ## time on Jan 1, 0000. | |
| 29 ## | |
| 30 ## The returned value is also called a "serial date number" | |
| 31 ## (see @code{datenum}). | |
| 32 ## @seealso{clock, date, datenum} | |
| 33 ## @end deftypefn | |
| 34 | |
| 35 ## Author: pkienzle <pkienzle@users.sf.net> | |
| 36 ## Created: 10 October 2001 (CVS) | |
| 37 ## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com> | |
| 38 | |
| 39 function t = now () | |
| 40 | |
| 41 t = datenum (clock ()); | |
| 42 | |
| 43 ## The following doesn't work (e.g., one hour off on 2005-10-04): | |
| 44 ## | |
| 45 ## seconds since 1970-1-1 corrected by seconds from GMT to local time | |
| 46 ## divided by 86400 sec/day plus day num for 1970-1-1 | |
| 47 ## t = (time - mktime(gmtime(0)))/86400 + 719529; | |
| 48 ## | |
| 49 ## mktime(gmtime(0)) does indeed return the offset from Greenwich to the | |
| 50 ## local time zone, but we need to account for daylight savings time | |
| 51 ## changing by an hour the offset from CUT for part of the year. | |
| 52 | |
| 53 endfunction |