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A yoctosecond is one septillionth of a second, or 10−24 s. It is the smallest unit of time in the International System of Units (SI) and the first of the prefixes based on the decimal system. See the table of units of time and their lengths on Wikipedia.
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.
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It is based on atomic clocks and is not adjusted for daylight saving time. Learn about its history, uses, mechanism, and leap seconds.
Universal Time (UT or UT1) is a time standard based on Earth's rotation, computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame. Learn about the origin, evolution and global usage of UT and its variations, such as Greenwich Mean Time, Coordinated Universal Time and DUT1.
A time zone is an area that observes a uniform standard time for legal, commercial and social purposes. Learn how time zones are defined by offsets from Coordinated Universal Time (UTC), and see a table of locations and their UTC offsets with or without daylight saving time.
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.
A comprehensive list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round, as well as information on daylight saving time or historical changes in offsets.
≡ Time of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at 0 K [8] (but other seconds are sometimes used in astronomy). Also that time it takes for light to travel a distance of 299 792 458 metres. (SI base unit) shake: ≡ 10 −8 s = 10 ns ...