Title: Time in the United Kingdom
Content:  The United Kingdom uses Greenwich Mean Time or Western European Time (UTC) and British Summer Time or Western European Summer Time (UTC+01:00).
Title: Time in the United Kingdom
Content:  The IANA time zone database contains one zone for the United Kingdom in the file zone.tab, named Europe/London. This refers to the area having the ISO 3166-1 alpha-2 country code "GB". The zone names Europe/Guernsey, Europe/Isle_of_Man and Europe/Jersey exist because they have their own ISO 3166-1 alpha-2 but the zone.tab entries are links to Europe/London. There are several entries for UK possessions around the world. Data directly from zone.tab of the IANA time zone database. Columns marked with * are the columns from zone.tab itself.
Title: Outline of the United Kingdom
Content: Time zone of the UK 
Title: Outline of London
Content: London is situated in the following regions: ; Northern Hemisphere, Western Hemisphere & Eastern Hemisphere (on the Prime meridian) ; Atlantic Ocean ; Eurasia ; Europe ; Northern Europe ; Western Europe ; British Isles ; United Kingdom ; Great Britain ; England ; London commuter belt ; Greater London Built-up Area ; Greater London Time zone: Western European Time (UTC±00:00), Coordinated Universal Time (UTC±00:00), Greenwich Mean Time  
Title: Mechanical watch
Content: UTC±00:00 - 🇬🇧 London ; UTC+01:00 - 🇳🇱 Amsterdam ; UTC+01:00 - 🇩🇪 Berlin ; UTC+01:00 - 🇧🇪 Brussels ; UTC+01:00 - 🇫🇷 Paris ; UTC+02:00 - 🇪🇬 Cairo ; UTC+03:00 - 🇷🇺 Moscow ; UTC+04:00 - 🇦🇪 Abu Dhabi/Dubai ; UTC+05:00 - 🇵🇰 Karachi ; UTC+06:00 - 🇧🇩 Dhaka ; UTC+07:00 - 🇹🇭 Bangkok ; UTC+08:00 - 🇹🇼 Taipei / 🇨🇳 Beijing / Hong Kong ; UTC+09:00 - 🇰🇷 Seoul / 🇯🇵 Tokyo ; UTC+10:00 - 🇦🇺 Sydney / 🇦🇺 Melbourne ; UTC+11:00 - 🇫🇷 Nouméa ; UTC+12:00 - 🇳🇿 Auckland ; UTC+13:00 - Samoa ; UTC−10:00 - 🇺🇸 Honolulu ; UTC−09:00 - 🇺🇸 Anchorage ; 
Title: Greenwich Mean Time
Content:  Greenwich Mean Time (GMT) is the mean solar 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. English speakers often use GMT as a synonym for Coordinated Universal Time (UTC): in modern usage, this is incorrect – GMT is now a time zone, 
Title: Continental time
Content:  In the United Kingdom continental time can refer to the Central European Time zone or to the 24-hour clock, though the latter usage has been declining as use of the 24-hour clock has increased.
Title: Summer time in Europe
Content:  a member state of the European Union. Since 1996, all clocks in the European Union have changed to summer or winter time on the same dates and at the same moment, at 01:00 UTC+00:00 (Thus summer time ends at 01:59:59 UTC+01:00). Guernsey, Jersey, and the Isle of Man observe the same time as the UK. Gibraltar uses the same time as Spain. , it appears that the UK government intends to continue to operate winter and summer time on these dates, irrespective of any EU decision on the matter. This may have the effect that Northern Ireland will have a different time zone from the Republic of Ireland.
Title: Summer time in Europe
Content: Summer Time starts: Last Sunday in March ; Summer Time ends: Last Sunday in October In the United Kingdom, local time during this period is known as British Summer Time (BST) (UTC+01:00, WEST) while local time during the rest of the year is normally referred to as Greenwich Mean Time (GMT), (UTC+00:00, WET). Legislation: Summer Time Act 1916; Summer Time Act 1922; Time (Ireland) Act, 1916; Summer Time Act, 1925;  Emergency Powers (Defence) Act, 1939; The Summer Time Order 1964; The Summer Time Order 1967; Summer Time Act 1972;  The Summer Time Order 1997; The Summer Time Order 2002. The UK was, until 23:00 GMT on 31 January 
Title: Central European Time
Content:  and 1992&ndash;1996. The time around the world is based on Universal Coordinated Time (UTC) which is roughly synonymous with Greenwich Mean Time (GMT). From late March to late October, clocks in the United Kingdom are put forward by one hour for British Summer Time (BST). Since 1997, most of the European Union aligned with the British standards for BST. In 1968 there was a three-year experiment called British Standard Time, when the UK and Ireland experimentally employed British Summer Time (GMT+1) all year round; clocks were put forward in March 1968 and not put back until October 1971. Central European Time is sometimes referred to as continental time in the UK.

Question: what is london uk time zone?
Answer: Greenwich Mean Time.