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Learn about the 24-hour clock, the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. See how it is indicated by the hours and minutes passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day.
Metric time is the measure of time intervals using the metric system, with the second as the base unit. Learn about the origin, evolution and usage of metric time units, such as kiloseconds, milliseconds and decicés.
Decimal time is the representation of the time of day using units which are decimally related, such as 10 hours, 100 minutes and 100 seconds. Learn about the history and systems of decimal clocks in different cultures, such as Egypt, China, France and Japan.
Learn how dates and times are written and spoken in the U.S., and how they differ from international standards. Find out about the various formats used by the military, government, and other domains.
Learn the meaning and usage of military terms such as D-Day, H-Hour, L-Day, and more. D-Day is the unnamed day on which an operation commences or is due to commence, such as June 6, 1944, the invasion of Normandy.
IRIG timecode is a standard format for transferring timing information, used by atomic frequency standards and GPS receivers. IRIG B is the most common format, transmitting one pulse per second on a 1 kHz carrier with BCD coded expressions.
A clock face is the part of an analog clock that displays time with a dial and hands. Learn about the origin, evolution and variations of clock faces, from 12-hour to 24-hour, from Roman numerals to graduations, and more.
Learn about the decimal prefixes and units of time from picoseconds to years, and their applications in science and technology. A picosecond is one trillionth of a second, and it is used to measure the lifetime of a bottom quark or the period of a cesium-133 photon.