24-hour clock
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The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours passed since midnight, from 00 to
World War II RAF sector clock that can be read in 24-hour notation.
24-hour digital clock in Miaoli HSR station.
A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.
24-hour clock as seen on the USS Midway (CV-41).
12-hour clock
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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. and p.m.. Each period consists of 12 hours numbered: 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 1
24-hour clock
…and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, and is used by the international standard ISO 8601. A number of countries, particularly…
Exeter Cathedral Astronomical Clock, showing the double-XII numbering scheme
Typical digital 12-hour alarm clock indicating p.m. with a dot to the left of the hour.
Typical analogue 12-hour clock