AST to CST Time Converter
Use this AST to CST time converter to compare Canada and US Central time instantly. CST is 2 hours behind AST, so 9:00 AM AST becomes 7:00 AM CST and 5:00 PM AST becomes 3:00 PM CST. 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 CST Quick Facts
Use this AST to CST converter to compare Canada and US Central time, check the 2 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 11:00 AM AST / 9:00 AM CST.
How to Convert AST to CST
Converting between Atlantic Standard Time and Central Standard Time means accounting for a 2 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 Central Standard Time (UTC -6) time appears immediately. Since CST is 2 hours behind of AST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the CST 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 CST Converter
When someone in Canada suggests 11:00 AM AST, that's 9:00 AM CST. 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 CST because of the 2 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–CST 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 CST so you know exactly when to tune in — with a 2 hours difference, a morning event in Canada falls during work hours in United States.
AST to CST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Atlantic Standard Time to Central Standard Time full day schedule
| Atlantic Standard Time | Central Standard Time |
|---|---|
| 12:00 AM |
10:00 PM
(previous day)
|
| 1:00 AM |
11:00 PM
(previous day)
|
| 2:00 AM |
12:00 AM
|
| 3:00 AM |
1:00 AM
|
| 4:00 AM |
2:00 AM
|
| 5:00 AM |
3:00 AM
|
| 6:00 AM |
4:00 AM
|
| 7:00 AM |
5:00 AM
|
| 8:00 AM |
6:00 AM
|
| 9:00 AM |
7:00 AM
|
| 10:00 AM |
8:00 AM
|
| 11:00 AM |
9:00 AM
|
| 12:00 PM |
10:00 AM
|
| 1:00 PM |
11:00 AM
|
| 2:00 PM |
12:00 PM
|
| 3:00 PM |
1:00 PM
|
| 4:00 PM |
2:00 PM
|
| 5:00 PM |
3:00 PM
|
| 6:00 PM |
4:00 PM
|
| 7:00 PM |
5:00 PM
|
| 8:00 PM |
6:00 PM
|
| 9:00 PM |
7:00 PM
|
| 10:00 PM |
8:00 PM
|
| 11:00 PM |
9:00 PM
|
Timezone offsets and DST rules verified against the IANA Time Zone Database. Conversion math and business-hour overlap windows double-checked against real-world scheduling scenarios.
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