What is the difference between BST and UTC?
BST is 1 hour ahead of UTC. BST (British Summer Time) is used during Daylight Saving Time in the United Kingdom, typically from March to October.
UTC time
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BST-Britain
British Summer Time
18 Dec 2025
Frequently Asked Questions
Does this area observe DST?
BST itself is the daylight saving time version of GMT. BST is observed from the last Sunday in March to the last Sunday in October, when the region switches back to GMT (Greenwich Mean Time, UTC+0:00).
Which major cities follow this pattern?
Cities such as London, Edinburgh, Cardiff, and Belfast follow BST during the summer months.
What areas share the same hours?
The United Kingdom and Ireland (which uses IST - Irish Standard Time, also UTC+1:00 during summer) observe BST or equivalent during daylight saving time.
How does this compare with GMT?
BST is 1 hour ahead of GMT. BST (UTC+1:00) is used during summer months, while GMT (UTC+0:00) is used during winter months.
Why does this area observe DST?
Daylight saving time is observed to make better use of daylight during the longer summer days, potentially reducing energy consumption and allowing for more evening activities.
How did this system get established?
BST was established in the United Kingdom in 1916 during World War I to conserve energy. It has been used on and off since then, with the current system in place since 2002.
What are the typical work hours here?
Business hours in areas following BST are typically from 9:00 AM to 5:00 PM, with a lunch break in the middle of the day.
What is the economic importance of this area?
The United Kingdom is a major global financial center, with London serving as one of the world's leading economic hubs for finance, technology, and international business.