function checkleapyear(datea)
{
	if(datea.getYear()%4 == 0)
	{
		if(datea.getYear()% 10 != 0)
		{
			return true;
		}
		else
		{
			if(datea.getYear()% 400 == 0)
				return true;
			else
				return false;
		}
	}
return false;
}

function DaysInMonth(Y, M) {
    with (new Date(Y, M, 1, 12)) {
        setDate(0);
        return getDate();
    }
}

function datediff(date1, date2) {
    var y1 = date1.getFullYear(), m1 = date1.getMonth(), d1 = date1.getDate(),
	 y2 = date2.getFullYear(), m2 = date2.getMonth(), d2 = date2.getDate();

    if (d1 < d2) {
        m1--;
        d1 += DaysInMonth(y2, m2);
    }
    if (m1 < m2) {
        y1--;
        m1 += 12;
    }
    return [y1 - y2, m1 - m2, d1 - d2];
}

function calage(denneDag, denneManed, detteAar, fodtDag, fodtManed, fodtAar)
{
		var curday = denneDag;
		var curmon = denneManed;
		var curyear = detteAar;

		var calday = fodtDag;
		var calmon = fodtManed;
		var calyear = fodtAar;
		
		var curd = new Date(curyear,curmon-1,curday);
		var cald = new Date(calyear,calmon-1,calday);
		
		var diff =  Date.UTC(curyear,curmon,curday,0,0,0) - Date.UTC(calyear,calmon,calday,0,0,0);

		var dife = datediff(curd,cald);
		return curday +"."+ curmon +"."+ curyear +" - "+dife[0] +" &aring;r "+dife[1]+" m&aring;neder "+dife[2]+" dage";
}