Custom classes for each date

[stokske]

Is there a possiblity to assign a classname to each different date?

Currently i have two dates selected, but i want them both to have another classname, the first one 'blue' and the second one 'red'. Anybody a suggestion? Below my current code. Here i try to give the selected and the not selected dates another classname, but even that doesn't seem to work...

        onRenderCell: function (element, date) {
            if (date.selected == true) {
                return { className: "red" };
            } else {
                return { className: "blue" };
            }
        }