British Summer Time in the context of Samara Time

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; as a consequence, it cannot be used to specify a particular time unless a context is given. The term "GMT" is also used as one of the names for the time zone UTC+00:00 and, in UK law, is the basis for civil time in the United Kingdom.

Because of Earth's uneven angular velocity in its elliptical orbit and its axial tilt, noon (12:00:00) GMT is rarely the exact moment the Sun crosses the Greenwich Meridian and reaches its highest point in the sky there. This event may occur up to 16 minutes before or after noon GMT, a discrepancy described by the equation of time. Noon GMT is the annual average (the arithmetic mean) moment of this event, which accounts for the word "mean" in "Greenwich Mean Time".

The Wimbledon Championships, commonly called Wimbledon, is a tennis tournament organised by the All England Lawn Tennis and Croquet Club in collaboration with the Lawn Tennis Association annually in Wimbledon, London. It is chronologically the third of the four Grand Slam tennis events each year, held after the Australian Open and the French Open and before the US Open. It is the oldest tennis tournament in the world and is widely regarded as the most prestigious.

Wimbledon has been held since 1877 and is played on outdoor grass courts; it is the only tennis major still played on grass, the traditional surface. It is also the only major that retains a night-time curfew for logistical reasons, with matches continuing until 23:00 BST under floodlighting since 2009.

Kaliningrad Time (KALT; Russian: калининградское время, romanized: kaliningradskoye vremya) is the time zone two hours ahead of UTC (UTC+02:00) and one hour behind Moscow Time (MSK−1). It is used in Kaliningrad Oblast.

Until 2011, Kaliningrad Time was identical to Eastern European Time (UTC+02:00; UTC+03:00 with daylight saving time). On 27 March 2011, Russia moved to permanent DST, switching Kaliningrad time permanently to UTC+03:00. On 26 October 2014, this law was reversed but daylight saving time was not reintroduced, so Kaliningrad is now permanently set to UTC+02:00.

Daylight saving time (DST), also referred to as daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time. The standard implementation of DST is to set clocks forward by one hour in spring or late winter, and to set clocks back by one hour to standard time in the autumn (or fall in North American English, hence the mnemonic: "spring forward and fall back").

In several countries, the number of weeks when DST is observed is much longer than the number devoted to standard time.

Charles III became King of the United Kingdom and of 14 other Commonwealth realms upon the death of his mother, Elizabeth II, on 8 September 2022. Royal succession in the realms occurs immediately upon the death of the reigning monarch. The formal proclamation in Britain occurred on 10 September 2022, at 10:00 BST, the same day on which the Accession Council gathered at St James's Palace in London. The other realms, including most Canadian provinces and all Australian states, issued their own proclamations at times relative to their time zones, following meetings of the relevant privy or executive councils. While the line of succession is identical in all the Commonwealth realms, the royal title as proclaimed is not the same in all of them.

Central European Summer Time (CEST, UTC+02:00), sometimes referred to as Central European Daylight Time (CEDT), is the standard clock time observed during the period of summer daylight-saving in those European countries which observe Central European Time (CET; UTC+01:00) during the other part of the year. It corresponds to UTC+02:00, which makes it the same as Eastern European Time, Central Africa Time, South African Standard Time, Egypt Standard Time and Kaliningrad Time in Russia.

Eastern European Time (EET) is one of the names of the UTC+02:00 time zone, 2 hours ahead of Coordinated Universal Time. The zone uses daylight saving time, so that it uses UTC+03:00 during the summer.

A number of African countries use UTC+02:00 all year long, where it is called Central Africa Time (CAT), although Egypt and Libya also use the term Eastern European Time.

Bush House is a Grade II listed building at the southern end of Kingsway between Aldwych and the Strand in London, England. It was conceived as a major new trade centre by American industrialist Irving T. Bush, and commissioned, designed, funded, and constructed under his direction. The design was approved in 1919, work began in 1925, and was completed in 1935. Erected in stages, by 1929 Bush House was already declared the "most expensive building in the world".

Now part of the Strand Campus of King's College London, Bush House previously served as the headquarters of the BBC World Service. Broadcasting from Bush House lasted for 70 years, from winter 1941 to summer 2012. The final BBC broadcast from Bush House was the 12 noon BST news bulletin on 12 July 2012. The BBC World Service is now housed in Broadcasting House in Portland Place. King's College London has taken over the premises since acquiring the lease in 2015.

Europe spans seven primary time zones (from UTC−01:00 to UTC+05:00), excluding summer time offsets (five of them can be seen on the map, with one further-western zone containing the Azores, and one further-eastern zone spanning the Ural regions of Russia and European part of Kazakhstan). Most European countries use summer time and harmonise their summer time adjustments; see Summer time in Europe for details.

The time zones actually in use in Europe differ significantly from uniform zoning based purely on longitude, as used for example under the nautical time system. The world could in theory be divided into 24 time zones, each spanning 15 degrees of longitude. However, due to geographical and cultural factors, it is not practical to divide the world so evenly, and actual time zones may differ significantly from those based purely on longitude. In Europe, the widespread use of Central European Time (CET) causes major variations in some areas from solar time. Based on solar time, CET would range from 7.5 to 22.5°E. However, for example Spain (almost entirely in the Western hemisphere) and France (almost entirely west of 7.5°E, as illustrated in the map below) should theoretically use UTC, as they did before the Second World War. The general result is a solar noon which is much later than clock noon, and later sunrises and sunsets than should theoretically happen. The Benelux countries should also theoretically use GMT.

Western European Time (WET, UTC+00:00) is a time zone covering parts of western Europe and consists of countries using UTC+00:00 (also known as Greenwich Mean Time, abbreviated GMT). It is one of the three standard time zones in the European Union along with Central European Time and Eastern European Time.

The following Western European countries and regions use UTC+00:00 in winter months:

Western European Summer Time (WEST, UTC+01:00) is a summer daylight saving time scheme, 1 hour ahead of Greenwich Mean Time and Coordinated Universal Time. It is used in:

• the Canary Islands
• Portugal (including Madeira but not the Azores, which uses UTC+00;00)
• the Faroe Islands

The following countries also use the same time zone for their daylight saving time but use a different title:

Ireland uses Irish Standard Time (IST, UTC+01:00; Irish: Am Caighdeánach Éireannach) in the summer months and Greenwich Mean Time (UTC+00:00; Irish: Meán-Am Greenwich) in the winter period.

The Standard Time Act 1968 legally established that "the time for general purposes in the State (to be known as standard time) shall be one hour in advance of Greenwich mean time throughout the year". This act was amended by the Standard Time (Amendment) Act 1971, which legally established Greenwich Mean Time as a winter time period. Ireland therefore operates one hour behind its statutory standard time during the winter period, and reverts to standard time in the summer months. This definition contrasts with the practice of other states in the European Union, which operate one hour ahead of their standard time during the summer period, but produces the same result. The net effect is that time in Ireland is the same as that in Portugal and the United Kingdom, as well as, during the winter months, Iceland.

Eastern European Summer Time (EEST) is one of the names of the UTC+03:00 time zone, which is 3 hours ahead of Coordinated Universal Time. It is used as a summer daylight saving time in some European and Middle Eastern countries, which makes it the same as Arabia Standard Time, East Africa Time, and Moscow Time. During the winter periods, Eastern European Time (UTC+02:00) is used.

Since 1996, European Summer Time has been applied from the last Sunday in March to the last Sunday in October. Previously, the rules were not uniform across the European Union.

In Turkey, time is given by UTC+03:00 year-round. This time is also called Turkey Time (TRT). The time at most is the same as in the Moscow Time and Arabia Standard Time zones. TRT was adopted by the Turkish Government on 8 September 2016. It was also in use in Northern Cyprus until it reverted to Eastern European Time (EET) in October 2017.

During some seasons (March–October), the TRT coincides with the Eastern European Summer Time (the daylight-saving version of the Eastern European Time). The IANA time zone identifier for Turkey is Europe/Istanbul.

Armenia Time (AMT) is a time zone used in Armenia. It is four hours ahead of UTC at UTC+04:00.

Clock time is about one hour later than solar noon in Armenia. Consequently, population activity hours are similar to those in Paris or Barcelona, which have about the same shift to solar time. They are about one hour later compared to those in Berlin and Vienna, and are two hours later than those in Warsaw and New York.

Georgia Time (GET) is a time zone used in Georgia and it is uniform throughout the country. It moved from zone UTC+04:00 to UTC+03:00 on 27 June 2004, then back to UTC+04:00 on 27 March 2005. Georgia has not observed daylight saving time since 2004.

The IANA time zone database contains one zone for Georgia in the file zone.tab, named after Georgian capital city, Tbilisi. In Georgia, it is called the Tbilisi Time (Georgian: თბილისის დრო, romanized: Tbilisis Dro).

West Africa Time, or WAT, is a time zone used in west-central Africa. West Africa Time is one hour ahead of Coordinated Universal Time (UTC+01:00), which aligns it with Central European Time (CET) during winter, and Western European Summer Time (WEST) / British Summer Time (BST) during summer.

As most of this time zone is in the tropical region, there is little change in day length throughout the year and therefore daylight saving time is not observed.

LulzSec (a contraction for Lulz Security) is a grey hat computer hacking group that claimed responsibility for several high profile attacks, including the compromise of user accounts from PlayStation Network in 2011. The group also claimed responsibility for taking the CIA website offline. Some security professionals have commented that LulzSec has drawn attention to insecure systems and the dangers of password reuse. It has gained attention due to its high profile targets and the sarcastic messages it has posted in the aftermath of its attacks. One of the founders of LulzSec was computer security specialist Hector Monsegur, who used the online moniker Sabu. He later helped law enforcement track down other members of the organization as part of a plea deal. At least four associates of LulzSec were arrested in March 2012 as part of this investigation. Prior, British authorities had announced the arrests of two teenagers they alleged were LulzSec members, going by the pseudonyms T-flow and Topiary.

At just after midnight (BST, UT+01) on 26 June 2011, LulzSec suddenly released a "50 days of lulz" statement, which they claimed to be their final release, confirming that LulzSec consisted of six members, and that their website was to be shut down. Their final release included accounts and passwords from many different sources. Despite claims of retirement, the group committed another hack against newspapers owned by News Corporation on 18 July, defacing them with false reports regarding the death of Rupert Murdoch. The group had also helped launch Operation AntiSec, a joint effort involving LulzSec, Anonymous, and other hackers.