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The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").
In the 24-hour time notation, the day begins at midnight, 00:00 or 0:00, 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 [3] — that is, 24:00 of one day is the same time as 00:00 of the following day.
In 12-hour striking, used most commonly in striking clocks today, the clock strikes once at 1:00 am, twice at 2:00 am, continuing in this way up to twelve times at 12:00 mid-day, then starts again, striking once at 1:00 pm, twice at 2:00 pm, and the pattern continues up to twelve times at 12:00 midnight.
In Czech quarters and halves always refer to the following hour, e.g. čtvrt na osm (quarter on eight) meaning 7:15, půl osmé (half of eight) meaning 7:30 and tři čtvrtě na osm (three-quarters on eight) meaning 7:45. This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight).
The "midnight" term can be avoided altogether if the end of the day is noted as 24:00 and the beginning of the day as 00:00. While both notations refer to the same moment in time, the choice of notation allows its association with the previous night or with the following morning. "Midnight" can be augmented with additional disambiguating ...
The natural day (dies naturalis) ran from sunrise to sunset. [6] The hours were numbered from one to twelve as hora prima, hora secunda, hora tertia, etc. To indicate that it is a day or night hour, Romans used expressions such as for example prima diei hora (first hour of the day), and prima noctis hora (first hour of the night). [7]
There's a theory that states that waking at a certain time of night is actually a signal from your body about something going on inside. As you sleep, your body undergoes many states of activity.
The only way I can see to interpret it is as "hours until noon", in which case 12:01am should mean one minute before midnight, which is certainly doesn't. --Tango 17:17, 16 February 2009 (UTC) The way I see it is this: We divide the daylight hours into morning and afternoon, but we don't divide the night-time hours.