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UTC is also the time standard used in aviation, [8] e.g. for flight plans and air traffic control. In this context it is frequently referred to as Zulu time, as described below. Weather forecasts and maps all use UTC to avoid confusion about time zones and daylight saving time. The International Space Station also uses UTC as a time standard.
The letter "Z" ("Zulu") indicates Coordinated Universal Time (UTC). The ACP 121 standard actually refers to Greenwich Mean Time (GMT) as the base time standard, [ 1 ] but UTC has superseded GMT as a more precise time standard, [ 5 ] so the time offsets are commonly understood as UTC.
This is a 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.
In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC. [ 3 ] [ 4 ] The SDT column shows the offset from UTC during the winter, even in Ireland, where that's referred to as "winter time", and the DST column shows the offset from UTC during the summer, even in Ireland ...
However the ACP 121 standard that defines the list of military time zones makes no mention of UTC and derives the "Zulu time" from the Greenwich Mean Time [31] which was formerly used as the international civil time standard. GMT is no longer precisely defined by the scientific community and can refer to either UTC or UT1 depending on context. [32]
UTC time is also known as "Zulu" time, since "Zulu" is a phonetic alphabet code word for the letter "Z". [ 27 ] Offsets from UTC are written in the format ±hh:mm, ±hhmm, or ±hh (either hours ahead or behind UTC).
Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; [1] as a consequence, it cannot be used to specify a particular time unless a context is given.
UTC−03:00 (Brasília time) – The Southeast Region, the South Region, the Northeast Region (except some islands), Goiás, Distrito Federal, Tocantins, Pará, Amapá UTC−02:00 ( Brasília time +1 ) – Some islands on the east coast of Brazil ( Fernando de Noronha , Trindade and Martim Vaz , Rocas Atoll , Saint Peter and Saint Paul ...