Clockjumper

Timezone conversion

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

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

CST is currently 2 hours behind AST.

AST • ADT (UTC-3)
2:13 PM
Wednesday, Jul 8
CST • CDT (UTC-5)
12:13 PM
Wednesday, Jul 8

Abbreviation disambiguation

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

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

Interactive converter

12:00PM

12
:
00

Full AST to CST conversion table

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

Daylight saving and how the gap changes

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

Frequently asked questions

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 behind — 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?
Yes — Atlantic Standard Time observes DST, so its UTC offset shifts by 1 hour(s) between winter and summer.
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.
What time is 9 AM AST in CST?
9:00 AM AST is 7:00 AM CST.
What time is 12 PM (noon) AST in CST?
12:00 PM AST is 10:00 AM CST.
What time is 5 PM AST in CST?
5:00 PM AST is 3:00 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). Mid-morning AST is usually the safest window 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 means Atlantic Standard Time. Disambiguation: major collision: Arabia Standard Time (Asia/Riyadh) — page must disambiguate
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

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