Clockjumper

Timezone conversion

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

AST is currently 2 hours ahead of CST. This offset stays the same all year — neither zone shifts for daylight saving in a way that changes it.

AST is currently 2 hours ahead of CST.

CST • CDT (UTC-5)
12:14 PM
Wednesday, Jul 8
AST • ADT (UTC-3)
2:14 PM
Wednesday, Jul 8

Abbreviation disambiguation

CST here means Central Standard Time (US). Note: collides: China Standard Time, Cuba Standard Time

AST here means Atlantic Standard Time. Note: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate

Interactive converter

12:00PM

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Full CST to AST conversion table

CSTAST
12:00 AM2:00 AM
1:00 AM3:00 AM
2:00 AM4:00 AM
3:00 AM5:00 AM
4:00 AM6:00 AM
5:00 AM7:00 AM
6:00 AM8:00 AM
7:00 AM9:00 AM
8:00 AM10:00 AM
9:00 AM11:00 AM
10:00 AM12:00 PM
11:00 AM1:00 PM
12:00 PM2:00 PM
1:00 PM3:00 PM
2:00 PM4:00 PM
3:00 PM5:00 PM
4:00 PM6:00 PM
5:00 PM7:00 PM
6:00 PM8:00 PM
7:00 PM9:00 PM
8:00 PM10:00 PM
9:00 PM11:00 PM
10:00 PM12:00 AM(next day)
11:00 PM1:00 AM(next day)

Daylight saving and how the gap changes

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

Frequently asked questions

Is AST ahead of or behind CST right now?
AST is currently 2 hours ahead of CST.
What is the current CST to AST time difference?
Right now the gap is 2 hours ahead — AST is 2 hours ahead of CST.
Does the CST → AST offset change during the year?
No. Neither Central Standard Time (US) nor Atlantic Standard Time shifts for daylight saving in a way that changes this offset — the gap is the same all year.
Does CST observe daylight saving time?
Yes — Central Standard Time (US) observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
Does AST observe daylight saving time?
Yes — Atlantic Standard Time observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
What time is 9 AM CST in AST?
9:00 AM CST is 11:00 AM AST.
What time is 12 PM (noon) CST in AST?
12:00 PM CST is 2:00 PM AST.
What time is 5 PM CST in AST?
5:00 PM CST is 7:00 PM AST.
When is the best time to schedule a call between CST and AST?
The working-hours overlap (09:00–17:00 in both zones) runs roughly 9:00 AM – 3:00 PM CST (≈ 6 hours). Mid-morning CST is usually the safest window for a live call.
What time zone does CST refer to?
CST refers to Central Standard Time (US) (IANA: America/Chicago).
What time zone does AST refer to?
AST refers to Atlantic Standard Time (IANA: America/Halifax).
Is CST on this page the same as other zones that share the letters "CST"?
On Clockjumper, CST means Central Standard Time (US). Disambiguation: collides: China Standard Time, Cuba Standard Time
Is AST on this page the same as other zones that share the letters "AST"?
On Clockjumper, AST means Atlantic Standard Time. Disambiguation: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate

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