British Summer Time is the daylight-saving offset used in the United Kingdom, one hour ahead of GMT.
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BST is not a separate IANA zone. It is the summer setting of Europe/London. When BST is active, clocks in London, Manchester, and Edinburgh read UTC+01:00. This page exists because people search for BST specifically when planning calls with the UK in spring and summer. In winter the same cities use GMT instead.
The offset shown above is computed from Europe/London at page render time using Intl.DateTimeFormat. It can change when daylight saving starts or ends.
BST typically runs from the last Sunday in March to the last Sunday in October. Outside that window, UK civil time is GMT.
British Summer Time (BST) uses the IANA identifier Europe/London. British Summer Time is the daylight-saving offset used in the United Kingdom, one hour ahead of GMT.
Right now British Summer Time is UTC+01:00. The live abbreviation reported by the timezone database is GMT+1.
Daylight saving time is in effect. Standard time is labeled GMT and daylight time is labeled BST. Dates are taken from IANA data, not hardcoded on this site.
Use the converter with Europe/London as the source zone, or open the Time Zone Converter and pick a city that uses BST. Offsets update automatically when daylight saving begins or ends.