Canada Atlantic Time to Greenwich Mean Time
Convert times between Canada Atlantic Time (AST, UTC-4:00) and Greenwich Mean Time (GMT, UTC+0:00). Greenwich Mean Time is 4 hours ahead of Canada Atlantic Time in standard time.
UTC-4:00 / -3:00→UTC+0:00 / +1:00
Live timezone converterUTC Offset Reference
| Timezone | Abbreviation | Standard offset | DST offset | Country |
|---|---|---|---|---|
| Canada Atlantic Time | AST / ADT | UTC-4:00 | UTC-3:00 | Canada |
| Greenwich Mean Time | GMT / BST | UTC+0:00 | UTC+1:00 | United Kingdom |
* DST offset applies during summer months. Exact transition dates vary by year.
Standard Time Conversion (AST → GMT)
| Canada Atlantic Time | Greenwich Mean Time |
|---|---|
| 12:00 AM AST | 4:00 AM GMT |
| 6:00 AM AST | 10:00 AM GMT |
| 9:00 AM AST | 1:00 PM GMT |
| 12:00 PM AST | 4:00 PM GMT |
| 3:00 PM AST | 7:00 PM GMT |
| 6:00 PM AST | 10:00 PM GMT |
| 9:00 PM AST | 1:00 AM (next day) GMT |
Daylight Saving Time (DST) Notes
- Canada Atlantic Time observes DST. Clocks advance 1 hour to ADT (UTC-3:00) roughly from month 3 to 11.
- Greenwich Mean Time observes DST. Clocks advance 1 hour to BST (UTC+1:00) roughly from month 3 to 10.
Frequently Asked Questions
How do I convert AST to GMT?
Add 4 hours to the AST time to get GMT. For example, 9:00 AM AST = 1:00 PM GMT.
What is the current UTC offset for Canada Atlantic Time?
Canada Atlantic Time is UTC-4:00 during standard time (AST) and UTC-3:00 during summer daylight saving time (ADT).
Is Greenwich Mean Time ahead or behind Canada Atlantic Time?
Greenwich Mean Time is 4 hours ahead of Canada Atlantic Time in standard time.
When is a good time to schedule a meeting between AST and GMT?
A good overlap window is around 9:00 AM AST / 1:00 PM GMT, which falls within business hours for both timezones.
Related Timezone Conversions
Canada Atlantic Time → US Eastern TimeAST / ESTCanada Atlantic Time → US Central TimeAST / CSTCanada Atlantic Time → US Mountain TimeAST / MSTCanada Atlantic Time → US Pacific TimeAST / PSTCanada Atlantic Time → US Alaska TimeAST / AKSTCanada Atlantic Time → Hawaii TimeAST / HSTCanada Atlantic Time → Central European TimeAST / CETCanada Atlantic Time → Eastern European TimeAST / EET
Need the exact current time?
Use the live ToolsHub timezone converter to see current times, DST status, and schedule across time zones.