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+## Copyright (C) 2004-2012 Paul Kienzle
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn  {Function File} {@var{c} =} calendar ()
+## @deftypefnx {Function File} {@var{c} =} calendar (@var{d})
+## @deftypefnx {Function File} {@var{c} =} calendar (@var{y}, @var{m})
+## @deftypefnx {Function File} {} calendar (@dots{})
+## Return the current monthly calendar in a 6x7 matrix.
+##
+## If @var{d} is specified, return the calendar for the month containing
+## the date @var{d}, which must be a serial date number or a date string.
+##
+## If @var{y} and @var{m} are specified, return the calendar for year @var{y}
+## and month @var{m}.
+##
+## If no output arguments are specified, print the calendar on the screen
+## instead of returning a matrix.
+## @seealso{datenum, datestr}
+## @end deftypefn
+
+## Author: pkienzle <pkienzle@users.sf.net>
+## Created: 25 July 2004
+## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
+
+function varargout = calendar (varargin)
+
+  switch (nargin)
+    case 0
+      v = clock ();
+      y = v(1);
+      m = v(2);
+      d = v(3);
+    case 1
+      v = datevec (varargin{1});
+      y = v(1);
+      m = v(2);
+      d = v(3);
+    case 2
+      y = varargin{1};
+      m = varargin{2};
+      d = [];
+    otherwise
+      print_usage ();
+  endswitch
+
+  c = zeros (7, 6);
+  dayone = datenum (y, m, 1);
+  ndays = eomday (y, m);
+  c(weekday (dayone) - 1 + [1:ndays]) = 1:ndays;
+
+  if (nargout > 0)
+    varargout{1} = c';
+  else
+    ## Layout the calendar days, 6 columns per day, 7 days per row.
+    str = sprintf ("    %2d    %2d    %2d    %2d    %2d    %2d    %2d\n", c);
+
+    ## Print an asterisk before the specified date
+    if (! isempty (d))
+      pos = weekday (dayone) + d - 1;
+      idx = 6*pos + fix (pos / 7.1) - ifelse (d < 10, 1, 2);
+      str(idx) = "*";
+    endif
+
+    ## Display the calendar.
+    s.year = y - 1900;
+    s.mon = m - 1;
+    puts (strftime ("                    %b %Y\n", s));
+    puts ("     S     M    Tu     W    Th     F     S\n");
+    puts (str);
+  endif
+
+endfunction
+
+
+## demos
+%!demo
+%! ## Calendar for current month
+%! calendar ()
+%!demo
+%! calendar (1957, 10)
+
+## tests
+%!assert ((calendar(2000,2))'(2:31), [0:29])
+%!assert ((calendar(1957,10))'(2:33), [0:31])
+
+%% Test input validation
+%!error calendar (1,2,3)
+