lbusdate.m

## 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} {b =} lbusdate (year, month)
## @deftypefnx {Function File} {b =} lbusdate (year, month, holiday)
## @deftypefnx {Function File} {b =} lbusdate (year, month, holiday, weekend)
##
## Return the datenum of the last business day of the @var{year} and
## @var{month}.  @var{holiday} is a vector of datenums that defines the
## holidays observed (the holidays function is used if not given).
## @var{weekend} defines the days of the week that should be considered
## weekends; [1 0 0 0 0 0 1] (default) indicates that Sunday and
## Saturday are holidays.
##
## If any of the optional inputs (@var{holiday}, @var{weekend}) are
## empty, then the default is used.
##
## @seealso{holidays, fbusdate, isbusday, busdate}
## @end deftypefn

## Author: Bill Denney <bill@denney.ws>
## Created: 2 Feb 2008

function rd = lbusdate (y, m, hol, wkend)

  rd = eomdate (y, m);
  if nargin < 3
      hol = [];
  end
  if nargin < 4
      wkend = [];
  elseif nargin < 3 || nargin > 4
      print_usage ();
  endif

  ## Test from the day after the end of the month so that the
  ## last day of the month is captured.
  rd = busdate (rd+1, -1, hol, wkend);

endfunction

## Tests
## A normal day
%!assert(lbusdate(2008,4), datenum(2008,4,30))
## A weekend
%!assert(lbusdate(2008,5), datenum(2008,5,30))