![]() This change also adopted leap seconds to simplify future adjustments. The system has been adjusted several times, including a brief period during which the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967. The coordination of time and frequency transmissions around the world began on 1 January 1960. It is effectively a successor to Greenwich Mean Time (GMT). It is within about one second of mean solar time (such as UT1) at 0° longitude (at the IERS Reference Meridian as the currently used prime meridian) and is not adjusted for daylight saving time. For other uses, see UTC (disambiguation).Ĭoordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. For the time zone that lies between UTC−1 and UTC+1, see UTC+00:00. People do not have to figure out if noon is 00h00, 24h or 12h to calculate duration."UTC" redirects here.7 o'clock in the evening is called 19:00. Fewer confusions between morning and evening e.g. ![]() To write shop opening hours until midnight use, for example, "00:00–24:00", "07:00–24:00".Īdvantages over the 12-hour clock system: For example, a train due to arrive at a station during the last minute of a day arrives at 24:00 but trains which depart during the first minute of the day go at 00:00. In railway timetables 24:00 means the end of the day. Many digital wristwatches and clocks can display the time of day using the 24-hour clock. In many African, Asian, European and Latin American countries people use it to write the time. ![]() military prefers not to say 24:00 - they do not like to have two names for the same thing, so they always say "23:59", which is one minute before midnight.Ģ4-hour clock time is used in computers, by the militaries, for public safety, and in transport. For example, you would say "Tuesday at 24:00" and "Wednesday at 00:00" to mean exactly the same time. ![]() Midnight is called 24:00 and is used to mean the end of the day and 00:00 is used to mean the beginning of the day. Under the 24-hour clock system, the day begins at midnight, 00:00, and the last minute of the day begins at 23:59 and ends at 24:00, which is identical to 00:00 of the following day. Numbers under 10 have a zero in front (called a leading zero) e.g. Also, the international standard notation of time ( ISO 8601) is based on this format.Ī time in the 24-hour clock is written in the form hours:minutes (for example, 01:23), or hours: minutes: seconds (01:23:45). In some parts of the world, it is called railway time. This system is also referred to (only in the United States and the English speaking parts of Canada) as military time or (only in the United Kingdom and now very rarely) as continental time. The 24-hour clock is a way of telling the time in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 23.
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