... perhaps because it should be h / 24 instead of h / 60 ? body.animate({"background-color": "rgb(" + parseInt((h / 60) * 255) + "," +

... perhaps because it should be h / 24 instead of h / 60 ? body.animate({"background-color": "rgb(" + parseInt((h / 60) * 255) + "," + parseInt((m / 60) * 255) + "," + parseInt((s / 60) * 255) + ")"});