AST to GMT Time Converter
Use this AST to GMT time converter to compare Canada and United Kingdom time instantly. GMT is 4 hours ahead of AST, so 9:00 AM AST becomes 1:00 PM GMT and 5:00 PM AST becomes 9:00 PM GMT. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
AST to GMT Quick Facts
Use this AST to GMT converter to compare Canada and United Kingdom time, check the 4 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM AST / 1:00 PM GMT.
How to Convert AST to GMT
Converting between Atlantic Standard Time and Greenwich Mean Time means accounting for a 4 hours gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Atlantic Standard Time (UTC -4) that you want to convert. Hit "Now" to load the current AST time instantly, or use "+1h" to step forward and compare.
The equivalent Greenwich Mean Time (UTC +0) time appears immediately. Since GMT is 4 hours ahead of AST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the GMT result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.
Why Choose Our AST to GMT Converter
When someone in Canada suggests 9:00 AM AST, that's 1:00 PM GMT. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night AST times can land on a different date in GMT because of the 4 hours offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the AST–GMT gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in AST. Convert the event time to GMT so you know exactly when to tune in — with a 4 hours difference, a morning event in Canada falls during work hours in Universal.
AST to GMT Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Atlantic Standard Time to Greenwich Mean Time full day schedule
| Atlantic Standard Time | Greenwich Mean Time |
|---|---|
| 12:00 AM |
4:00 AM
|
| 1:00 AM |
5:00 AM
|
| 2:00 AM |
6:00 AM
|
| 3:00 AM |
7:00 AM
|
| 4:00 AM |
8:00 AM
|
| 5:00 AM |
9:00 AM
|
| 6:00 AM |
10:00 AM
|
| 7:00 AM |
11:00 AM
|
| 8:00 AM |
12:00 PM
|
| 9:00 AM |
1:00 PM
|
| 10:00 AM |
2:00 PM
|
| 11:00 AM |
3:00 PM
|
| 12:00 PM |
4:00 PM
|
| 1:00 PM |
5:00 PM
|
| 2:00 PM |
6:00 PM
|
| 3:00 PM |
7:00 PM
|
| 4:00 PM |
8:00 PM
|
| 5:00 PM |
9:00 PM
|
| 6:00 PM |
10:00 PM
|
| 7:00 PM |
11:00 PM
|
| 8:00 PM |
12:00 AM
(next day)
|
| 9:00 PM |
1:00 AM
(next day)
|
| 10:00 PM |
2:00 AM
(next day)
|
| 11:00 PM |
3:00 AM
(next day)
|
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