AST to GMT Converter
Atlantic Time
12:22:40 PM ADT
Sunday, June 28, 2026
4h
4h
UK Time
4:22:40 PM BST
Sunday, June 28, 2026
UK Time (GMT / BST) is 4 hours ahead of Atlantic Time (AST / ADT).
Quick Reference
- Atlantic Time
- ADT (GMT-3)
AST starts on Nov 1, 2026
- UK Time
- BST (GMT+1)
GMT starts on Oct 25, 2026
Cities in AST
Cities in GMT
Frequently Asked Questions
- What is the difference between AST and GMT?
- GMT is 4 hours ahead of AST.
- How do I convert AST to GMT?
- To convert from AST to GMT, add 4 hours. Use the interactive converter on this page to convert specific times.
- What cities are in AST and GMT?
- Cities in AST include Halifax, Charlottetown. Cities in GMT include London, Edinburgh, Birmingham, Manchester, Belfast.