CDT to AST Time Converter
Convert time from CDT to AST. Enter any time to see the equivalent AST time, compare current CDT and AST times side by side, and find overlapping business hours for calls and meetings.
cdt to ast Quick Facts
Use this CDT to AST converter to compare US Central and Canada time, check the 1 hour gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM CDT / 10:00 AM AST.
How to Convert cdt to ast
Converting between Central Daylight Time and Atlantic Standard Time means accounting for a 1 hour gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Central Daylight Time (UTC -5) that you want to convert. Hit "Now" to load the current cdt time instantly, or use "+1h" to step forward and compare.
The equivalent Atlantic Standard Time (UTC -4) time appears immediately. Since ast is 1 hour ahead of cdt, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the ast 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 cdt to ast Converter
When someone in United States suggests 9:00 AM cdt, that's 10:00 AM ast. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night cdt times can land on a different date in ast because of the 1 hour 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 cdt–ast 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 cdt. Convert the event time to ast so you know exactly when to tune in — with a 1 hour difference, a morning event in United States falls during work hours in Canada.
cdt to ast Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Central Daylight Time to Atlantic Standard Time full day schedule
| Central Daylight Time | Atlantic Standard Time |
|---|---|
| 12:00 AM |
1:00 AM
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| 1:00 AM |
2:00 AM
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| 2:00 AM |
3:00 AM
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| 3:00 AM |
4:00 AM
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| 4:00 AM |
5:00 AM
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| 5:00 AM |
6:00 AM
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| 6:00 AM |
7:00 AM
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| 7:00 AM |
8:00 AM
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| 8:00 AM |
9:00 AM
|
| 9:00 AM |
10:00 AM
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| 10:00 AM |
11:00 AM
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| 11:00 AM |
12:00 PM
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| 12:00 PM |
1:00 PM
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| 1:00 PM |
2:00 PM
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| 2:00 PM |
3:00 PM
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| 3:00 PM |
4:00 PM
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| 4:00 PM |
5:00 PM
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| 5:00 PM |
6:00 PM
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| 6:00 PM |
7:00 PM
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| 7:00 PM |
8:00 PM
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| 8:00 PM |
9:00 PM
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| 9:00 PM |
10:00 PM
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| 10:00 PM |
11:00 PM
|
| 11:00 PM |
12:00 AM
(next day)
|
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Convert Other Time Zones to ast
Find the time difference from any major zone into Atlantic Standard Time. Use these pages when scheduling with Canada from a different region.