midnight in military time

so everybody wants to know what is the proper way to pronounce or write midnight in military time.Some people say 24:00 and others say 00:00 so which of these is the proper term.In the 24-hour time rotation, the day starts at midnight, 00:00, and the last minute of the day begins at 23:59. Where convenient, the notation 24:00 may also be used to refer to midnight at the end of a given date — that is, 24:00 of the current day is the same point in time as 00:00 of the following day.Here is a printable military time chart showing midnight in military time