--:--:--
—
San Juan · Barbados · Halifax (winter)
Schedule a fair multi-city call with the free meeting planner.
Difference
BST vs AST
UTC → UTC
--:--:--
—
London · Edinburgh · Cardiff
AST to BST converter
Convert AST to BST time now
Free AST to BST converter. See Atlantic Standard Time and British Summer Time side by side. Live clocks, a 5 hours gap, meeting hours, and a full-day chart for San Juan and London.
America/Puerto_Rico
—
AST → BST
To · British Summer Time
—
Europe/London
Interactive diagram
Watch AST convert into BST
Drag the Atlantic hour. Watch the British ST clock change.
Atlantic
9:00 AM AST
—
BST ← AST
British ST
—
Full-day chart
AST to BST hourly conversion chart
Full-day table. Tap a row to copy. Labels follow daylight saving.
| Atlantic | British ST | UTC offsets |
|---|
Meeting times
Best AST to BST meeting window
Find hours that work on both sides. Then save the slot to your calendar.
Follow along
Step-by-step AST to BST conversion
Four short steps to convert any AST time to BST.
Choose AST time
Select any hour in Atlantic Standard Time. Smart mode uses America/Puerto_Rico.
AST to BST conversion guide
AST to BST conversion guide
This AST to BST converter shows British Summer Time (UTC+1) for any Atlantic Standard Time (UTC−4) time. Use it to schedule between San Juan and London. Choose Smart DST for live city clocks. Choose Fixed mode when you only want the AST and BST labels.
Atlantic
AST
UTC−4
San Juan · Barbados · Halifax (winter)
AST vs BST—
British ST
BST
UTC+1
London · Edinburgh · Cardiff
What is AST to BST conversion?
AST to BST conversion turns a AST clock into the matching BST time. Use it for calls, travel, and teams in San Juan and London.
AST to BST time difference
BST is 5 hours ahead of AST. Add 5 hours to the AST time to get BST. The live clocks at the top show the current AST to BST gap.
AST vs BST
AST is UTC−4. BST is UTC+1. They are different names. If a region uses daylight saving, check the live labels.
AST to BST now / current time
Need ast to bst right now? Read the live clocks, or tap Use current time for an instant AST → BST result.
AST to BST time difference
Season / context — tap to explore
See how daylight saving can change this pair.
Atlantic—
—AST → BST
British ST—
Quick answers
Atlantic
Atlantic Standard Time (AST)
UTC−4
Atlantic Standard Time (AST) is UTC−4. Smart DST uses the city clock America/Puerto_Rico so daylight saving stays correct for San Juan · Barbados · Halifax (winter).
- Cities: San Juan · Barbados · Halifax (winter)
- City clock: America/Puerto_Rico
- Fixed AST: UTC−4
- On this page it pairs with BST (UTC+1)
British ST
British Summer Time (BST)
UTC+1
British Summer Time (BST) is UTC+1. Smart DST uses Europe/London for cities such as London · Edinburgh · Cardiff.
- Cities: London · Edinburgh · Cardiff
- City clock: Europe/London
- Fixed BST: UTC+1
- From AST: BST is 5 hours ahead of AST
AST to BST FAQ