The westernmost time zone uses UTC−12, being twelve hours behind UTC the easternmost time zone uses UTC+14, being fourteen hours ahead of UTC. Time zones around the world are expressed using positive or negative offsets from UTC, as in the list of time zones by UTC offset. The name "Coordinated Universal Time (UTC)" was approved by a resolution of IAU Commissions 4 and 31 at the 13th General Assembly in 1967 (Trans. In 1967 the CCIR adopted the names Coordinated Universal Time and Temps Universel Coordonne for the English and French names with the acronym UTC to be used in both languages. McCarthy described the origin of the abbreviation: The compromise that emerged was UTC, which conforms to the pattern for the abbreviations of the variants of Universal Time (UT0, UT1, UT2, UT1R, etc.). This abbreviation comes as a result of the International Telecommunication Union and the International Astronomical Union wanting to use the same abbreviation in all languages. The official abbreviation for Coordinated Universal Time is UTC. See the " Current number of leap seconds" section for the number of leap seconds inserted to date. Leap seconds are inserted as necessary to keep UTC within 0.9 seconds of the UT1 variant of universal time. The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by Earth's rotation. The General Conference on Weights and Measures adopted a resolution to alter UTC with a new system that would eliminate leap seconds by 2035. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT) and (c) standard signals should contain information on the difference between UTC and UT." 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. ( December 2023)Ĭoordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. Please read the length guidelines and help move details into the article's body. Select a calendar template below to download or print for free in PDF, Excel, or Microsoft Word format.This article's lead section may be too long. Monday start calendar or calendar with week numbers.Īlso available are free yearly and monthly calendars with holidays are available in 129 countries. So you don't have to download the calendar if you like to directly print it from the website.Īdditional calendar templates are availableĪ single page full-year calendar can be downloaded in our Upon completion of your event calendar, you can easily save, email, or print it out.įor those who are looking for an online calendar, the September 2018 calendar PDF is also an option. Meetings, and reminders on a daily, weekly, or monthly basis. It allow you to add any type of events, schedules, On the other hand, the September 2018 calendar Word versions are another great variation. You can easily download and save these calendars to your computer or other devices and The September 2018 calendar Excel formats are best for maintaining an online calendar. These high-quality monthly calendars are allĮditable, printable, and downloadable calendars. You can also print or download as many calendar templates as you want. You can choose whichever design or style you prefer to have. It’s available in multiple designs, giving you variety of options to select from. The free September 2018 calendars can be downloaded in PDF, Word, or Excel format. About our September 2018 Monthly Calendar Templates
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