/usr/share/octave/packages/3.2/time-1.0.9/m2xdate.m is in octave-time 1.0.9-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | ## Copyright (C) 2008 Bill Denney
##
## This software is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This software is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this software; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {exceldatenums =} m2xdate (datenums)
## @deftypefnx {Function File} {exceldatenums =} m2xdate (datenums, convention)
## @deftypefnx {Function File} {exceldatenums =} m2xdate (datenums, convention, "ExcelBug")
##
## Convert @var{datenums} from the internal date format to the format
## used by Microsoft Excel. If set to 0 (default, Excel for Windows),
## @var{convention} specifies to use the Excel 1900 convention where Jan
## 1, 1900 corresponds to Excel serial date number 1. If set to 1
## (Excel for Mac), @var{convention} specifies to use the Excel 1904
## convention where Jan 1, 1904 corresponds to Excel serial date number
## 0.
##
## Note that this does not take into account the Excel bug where 1900 is
## considered to be a leap year unless you give the "ExcelBug" option.
##
## Excel does not represent dates prior to 1 January 1900 using this
## format, so a warning will be issued if any dates preceed this date.
##
## @seealso{datenum, x2mdate}
## @end deftypefn
## Author: Bill Denney <bill@denney.ws>
## Created: 23 Jan 2008
function dates = m2xdate (dates, convention, excelbug)
if nargin == 1
convention = 0;
excelbug = false();
elseif nargin == 2
excelbug = false();
elseif nargin == 3
excelbug = strcmpi(excelbug, "ExcelBug");
else
print_usage ();
endif
if convention == 0
adj = datenum(1900, 1, 1) - 2;
elseif convention == 1
adj = datenum(1904, 1, 1);
endif
if excelbug
datemask = (dates < datenum(1900, 3, 1));
dates(datemask) = dates(datemask) - 1;
endif
dates = dates - adj;
if any (dates < 0)
warning ("Negative date found, this will not work within MS Excel.")
endif
endfunction
## Tests
%!assert(m2xdate(datenum(2008, 1, 1)), 39448)
%!assert(m2xdate(datenum(2007:2008, 1, 1)), [39083 39448])
%!assert(m2xdate(datenum(1900, 1, 1)), 2)
%!assert(m2xdate(datenum(1900, 1, 1), 0, "ExcelBug"), 1)
%!assert(m2xdate(datenum(1904, 1, 1), 1), 0)
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