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########################################################################
##
## Copyright (C) 1996-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{tf} =} is_leap_year ()
## @deftypefnx {} {@var{tf} =} is_leap_year (@var{year})
## Return true if @var{year} is a leap year and false otherwise.
##
## If no year is specified, @code{is_leap_year} uses the current year.
##
## For example:
##
## @example
## @group
## is_leap_year (2000)
## @result{} 1
## @end group
## @end example
## @seealso{weekday, eomday, calendar}
## @end deftypefn
function tf = is_leap_year (year)
if (nargin == 0)
t = clock ();
year = t(1);
endif
tf = (rem (year, 4) == 0 & rem (year, 100) != 0) | (rem (year, 400) == 0);
endfunction
%!assert (is_leap_year (2000), true)
%!assert (is_leap_year (1976), true)
%!assert (is_leap_year (1000), false)
%!assert (is_leap_year (1800), false)
%!assert (is_leap_year (1600), true)
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