AST to CST Time — Convert Atlantic Standard Time to Central Standard Time (US)

CST is currently 2 hours behind AST.

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

On Clockjumper, CST refers to US Central Standard Time (UTC−6). The same three letters are also used for China Standard Time (UTC+8) and Cuba Standard Time (UTC−5) — check the city or UTC offset to be sure which is meant.

The AST → CST offset stays constant across the year — neither zone shifts for daylight saving in a way that changes this gap.

Is CST ahead of or behind AST right now?

CST is currently 2 hours behind AST.

What is the current AST to CST time difference?

Right now the gap is 2 hours — CST is 2 hours behind AST.

Does the AST → CST offset change during the year?

No. Neither Atlantic Standard Time nor Central Standard Time (US) shifts for daylight saving in a way that changes this offset — the gap is the same all year.

Does AST observe daylight saving time?

AST is itself the standard-time form. Atlantic Standard Time is in force at UTC-4 through the winter months; outside that window the same zone is on ADT (UTC-3).

Does CST observe daylight saving time?

CST is itself the standard-time form. Central Standard Time (US) is in force at UTC-6 through the winter months; outside that window the same zone is on CDT (UTC-5).

What time is 3 AM AST in CST?

3:00 AM AST is 1:00 AM CST.

What time is 8 AM AST in CST?

8:00 AM AST is 6:00 AM CST.

What time is 9 AM AST in CST?

9:00 AM AST is 7:00 AM CST.

What time is 10 AM AST in CST?

10:00 AM AST is 8:00 AM CST.

What time is 11 AM AST in CST?

11:00 AM AST is 9:00 AM CST.

What time is 12 PM (noon) AST in CST?

12:00 PM AST is 10:00 AM CST.

What time is 2 PM AST in CST?

2:00 PM AST is 12:00 PM CST.

What time is 3 PM AST in CST?

3:00 PM AST is 1:00 PM CST.

What time is 4 PM AST in CST?

4:00 PM AST is 2:00 PM CST.

What time is 5 PM AST in CST?

5:00 PM AST is 3:00 PM CST.

What time is 9 PM AST in CST?

9:00 PM AST is 7:00 PM CST.

What time is 10 PM AST in CST?

10:00 PM AST is 8:00 PM CST.

When is the best time to schedule a call between AST and CST?

The working-hours overlap (09:00–17:00 in both zones) runs roughly 11:00 AM – 5:00 PM AST (≈ 6 hours). The midpoint of that window — 2:00 PM AST, 12:00 PM CST — is the safest single slot to propose for a live call.

What time zone does AST refer to?

AST refers to Atlantic Standard Time (IANA: America/Halifax).

What time zone does CST refer to?

CST refers to Central Standard Time (US) (IANA: America/Chicago).

Is AST on this page the same as other zones that share the letters "AST"?

On Clockjumper, AST refers to Atlantic Standard Time in Atlantic Canada and the Caribbean (UTC−4). The same letters are also used for Arabia Standard Time (UTC+3) — check the city or UTC offset to be sure which is meant.

Is CST on this page the same as other zones that share the letters "CST"?

On Clockjumper, CST refers to US Central Standard Time (UTC−6). The same three letters are also used for China Standard Time (UTC+8) and Cuba Standard Time (UTC−5) — check the city or UTC offset to be sure which is meant.

• CST to AST
• AST to EST
• AEST to CST
• AST to GMT
• BST to CST
• AST to IST
• CDT to CST
• AST to MST
• CET to CST
• AST to PST
• CST to AEST
• EST to AST
• CST to BST
• GMT to AST
• CST to CDT

• About AST (Atlantic Standard Time) →
• About CST (Central Standard Time (US)) →
• All timezone conversion pages →
• Explore workday-overlap research →