People do not have to figure out if noon is 00h00, 24h or 12h to calculate duration.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. Today, Greenwich Mean Time (GMT) is only the name of a time zone that is used by a few countries in Africa and Western Europe, including the UK during winter and all year in Iceland.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. Since then, GMT is no longer a time standard. Until 1972, Greenwich Mean Time (also known as Zulu time) was the same as Universal Time (UT). UTC was adjusted several times until 1972, when leap seconds were introduced to keep UTC in line with the Earth's rotation, which is not entirely even, and less exact than atomic clocks. The name Coordinated Universal Time was officially adopted in 1967. In 1960, the International Radio Consultative Committee formalized the concept of UTC, and it was put into practice the year after. The transit circle is a part of the telescope's mechanics and it is still cited as the prime meridian's original reference (0° longitude). The reference line or starting point, the Prime Meridian, was determined to be the transit circle at the Royal Observatory in Greenwich, London. This is the basis for the 24-hour time zone system we know today.Īt the time, Greenwich Mean Time (GMT) was chosen as the world’s time standard. Universal Time (UT) was created at the International Meridian Conference in 1884. It is used to compare the pace provided by TAI with the actual length of a day on Earth. Universal Time (UT1): Also known as astronomical time or solar time, it refers to the Earth's rotation.International Atomic Time (TAI): A time scale that combines the output of some 400 highly precise atomic clocks worldwide, and provides the exact speed for our clocks to tick.Two components are used to determine UTC: The world's timing centers have agreed to keep their time scales closely synchronized - or coordinated - therefore the name Coordinated Universal Time. UTC is the time standard commonly used across the world. The clock starts at 00:00 (that is, midnight) and it indicates the hours that have passed since then (that is, from 0 to 24). ©/stocknshares A Standard, Not a Time Zone The 24-hour clock is a convention of keeping time where the day typically runs from midnight midnight and it’s divided into twenty-four hours. The Greenwich Meridian in London, England. Business Date to Date (exclude holidays).
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