//------------------------------------------------------------------------
// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA - Pierre MARECHAL
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution.  The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt

// Copyright INRIA
// Date : 28 Dec 2005
//------------------------------------------------------------------------

function [Y,M,D,h,m,s] = datevec(N)

    lhs=argn(1);
    rhs=argn(2);

    common_year = [0,31,59,90,120,151,181,212,243,273,304,334,365];
    leap_year   = [0,31,60,91,121,152,182,213,244,274,305,335,366];

    if rhs<>1 then
        error(msprintf(gettext("%s: Wrong number of input argument: %d expected.\n"),"datevec",1));
    end

    if type(N) <> 1 then
        error(msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"),"datevec",1));
    end

    [nr,nc] = size(N);

    if nc == 1 then
        common_year = common_year';
        leap_year   = leap_year';
    end

    // for the moment : hour, minute, second
    // =========================================================================

    second = 86400*(N-floor(N));
    hour   = floor(second/3600);
    second = second - 3600*hour;
    minute = floor(second/60);
    second = second - 60*minute;

    // Now, the year
    // =========================================================================

    N    = floor(N);
    Year = floor(N/365.2425);

    temp = N - (365.0*Year + ceil(0.25*Year)- ceil(0.01*Year) + ceil(0.0025*Year));

    // On retranche 1 si la valeur est inferieur à 0

    mask       = (temp <= 0);
    Year(mask) = Year(mask)-1;

    N(mask)    = N(mask) - (365.0*Year(mask) + ceil(0.25*Year(mask)) - ceil(0.01*Year(mask)) + ceil(0.0025*Year(mask)));
    N(~mask)   = temp(~mask);

    // ... and the month
    // =========================================================================

    Month = int (N/29);

    // construction de la matrice

    month_day_mat = ones(nr,nc);

    month_day_mat(isLeapYear(Year))  = leap_year(Month(isLeapYear(Year))+1);
    month_day_mat(~isLeapYear(Year)) = common_year(Month(~isLeapYear(Year))+1);

    Month( N>month_day_mat ) = Month( N>month_day_mat )+1;

    Day = ones(nr,nc);

    month_day_mat(isLeapYear(Year))  = leap_year(Month(isLeapYear(Year)));
    month_day_mat(~isLeapYear(Year)) = common_year(Month(~isLeapYear(Year)));

    Day = N - month_day_mat;

    if (lhs==1) then
        Y(:,1) = matrix(Year  ,nr*nc , 1);
        Y(:,2) = matrix(Month ,nr*nc , 1);
        Y(:,3) = matrix(Day   ,nr*nc , 1);
        Y(:,4) = matrix(hour  ,nr*nc , 1);
        Y(:,5) = matrix(minute,nr*nc , 1);
        Y(:,6) = matrix(second,nr*nc , 1);
    else
        Y = Year;
        M = Month;
        D = Day;
        h = hour;
        m = minute;
        s = second;
    end

endfunction