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Timezone abbreviation
British Summer Time is commonly shown as BST and has an offset of UTC+01:00. BST is used in the United Kingdom during daylight saving time.
BST can also mean other local abbreviations, so context matters.
When to use it
Use BST for UK summer schedules, but use London time for calendar invites so the exact date controls the offset.
Daylight saving
BST is daylight saving time. UK standard time is GMT.
Avoid abbreviation mistakes
Timezone abbreviations are compact, but they are not always unique and they do not always describe daylight saving behavior. For exact meetings, choose a city and date in the converter. That lets the timezone database apply the correct local rules instead of relying on a fixed abbreviation.
Cities in BST