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[Military time] designating an unspecified time after midnight but before sunrise. Normally used in [reference] to either the time one goes to sleep, wakes up, or has to be on-the-job. Usually quite a while before sunrise, i.e.: well before 0500 hours ( 5AM for you civilians ) The name is a play on the way 24-hour time is handled in the Military. Times are pronounced as numbers and written without colons, i.e.: 4:30PM is 1630H or "sixteen-thirty hours". Times between midnight and noon such as 4:00AM are written as 0400 and have the [leading zero] called out as "zero" or the letter "O", as in "o-four-hundred".
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