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+## Copyright (C) 2004 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 2, 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, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{e} =} eomday (@var{y}, @var{m})
+## Return the last day of the month @var{m} for the year @var{y}.
+## @seealso{datenum, datevec, weekday}
+## @end deftypefn
+
+## Author: pkienzle <pkienzle@users.sf.net>
+## Created: 25 July 2004
+## Adapted-By: William Poetra Yoga Hadisoeseno <williampoetra@gmail.com>
+
+function e = eomday (y, m)
+
+  if (nargin != 2)
+    usage ("e = eomday (y, m)");
+  endif
+
+  eom = [31, 28, 31, 30 ,31, 30, 31, 31, 30, 31, 30, 31];
+  e = eom(m);
+  e += (m == 2) & (mod (y, 4) == 0 & (mod (y, 100) != 0 | mod (y, 400) == 0));
+
+endfunction
+
+# tests
+%!assert(eomday([-4:4],2),[29,28,28,28,29,28,28,28,29])
+%!assert(eomday([-901,901],2),[28,28])
+%!assert(eomday([-100,100],2),[28,28])
+%!assert(eomday([-900,900],2),[28,28])
+%!assert(eomday([-400,400],2),[29,29])
+%!assert(eomday([-800,800],2),[29,29])
+%!assert(eomday(2001,1:12),[31,28,31,30,31,30,31,31,30,31,30,31])
+%!assert(eomday(1:3,1:3),[31,28,31])
+%!assert(eomday(1:2000,2)',datevec(datenum(1:2000,3,0))(:,3))
+%!assert([1900:1999](find(eomday(1900:1999,2*ones(1,100))==29)),[1904,1908,1912,1916,1920,1924,1928,1932,1936,1940,1944,1948,1952,1956,1960,1964,1968,1972,1976,1980,1984,1988,1992,1996])
+# demos
+%!demo
+%! y = 1900:1999;
+%! e = eomday (y, 2 * ones (1, 100));
+%! y (find (e == 29))