AST to CHAST Converter
Chatham Islands (CHAST / CHADT) is 16.75 hours ahead of Atlantic Time (AST / ADT).
Quick Reference
- Atlantic Time
- ADT (GMT-3)
AST starts on Nov 1, 2026
- Chatham Islands
- GMT+13:45
GMT+12:45 starts on Apr 4, 2026
Cities in AST
Cities in CHAST
Frequently Asked Questions
- What is the difference between AST and CHAST?
- CHAST is 16.75 hours ahead of AST.
- How do I convert AST to CHAST?
- To convert from AST to CHAST, add 16.75 hours. Use the interactive converter on this page to convert specific times.
- What cities are in AST and CHAST?
- Cities in AST include Halifax, Charlottetown. Cities in CHAST include .