There have been various proposals over the years for a system of decimal time. Under one system the day would remain the same length of time as it is at present, but would be the basic unit of time, divided into 10 decidays each made up of 100 millidays. Clocks would show the time in decidays and millidays instead of hours and minutes. Midday would be 0:00 and midnight would, therefore, be 5:00.