AST to CST Converter

CST is 2h 0m behind AST. When it's 12:00 PM AST, it's 10:00 AM CST.

From

AST · UTC-4

12:09:47AM

Atlantic Standard Time

e.g. Halifax, Puerto Rico

To

CST · UTC-6

10:09:47PM

Central Standard Time

e.g. Chicago, Mexico City

Open in World ClockCST → AST
9:00 AM AST=7:00 AM CST
12:00 PM AST=10:00 AM CST
5:00 PM AST=3:00 PM CST

Hourly conversion (AST → CST)

ASTCST
12:00 AM10:00 PM(−1 day)
1:00 AM11:00 PM(−1 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

Shaded rows are within standard working hours (8am–6pm) on both sides.

CST here is US/Canada Central Time (UTC−6). It can also mean China Standard Time (UTC+8) or Cuba Standard Time; the summer daylight variant is CDT (UTC−5).

More AST conversions

Frequently asked questions

What is the time difference between AST and CST?
CST is 2h 0m behind AST. AST is UTC-4 and CST is UTC-6.
What is 12:00 PM AST in CST?
12:00 PM AST is 10:00 AM CST.
Does AST change for daylight saving time?
AST is a fixed offset of UTC-4 and does not itself change for daylight saving time.