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DateAlmanac

What is CST in AST?

Atlantic Time is 2 hours ahead

Central Time is on UTC−6:00 and Atlantic Time is on UTC−4:00 right now. That gap holds all year, because both zones change their clocks on the same dates.

Convert a time

AST — Atlantic Time

4:00 am

AST, Sat

Time in Chicago
2:28:42 AM
Time in Halifax
4:28:42 AM
Difference
+2 h
Next clock change
March 14, 2027

Daylight saving

Central Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on CDT after that.

Atlantic Time

Sunday, March 14, 2027

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ADT after that.

CST to AST conversion table

Every hour of Saturday, November 7, 2026, converted from Central Time to Atlantic Time. 2 of the 24 hours fall on a different calendar day in Halifax, which is marked.

12:00 am CST
2:00 am AST
1:00 am CST
3:00 am AST
2:00 am CST
4:00 am AST
3:00 am CST
5:00 am AST
4:00 am CST
6:00 am AST
5:00 am CST
7:00 am AST
6:00 am CST
8:00 am AST
7:00 am CST
9:00 am AST
8:00 am CST
10:00 am AST
9:00 am CST
11:00 am AST
10:00 am CST
12:00 pm AST
11:00 am CST
1:00 pm AST
12:00 pm CST
2:00 pm AST
1:00 pm CST
3:00 pm AST
2:00 pm CST
4:00 pm AST
3:00 pm CST
5:00 pm AST
4:00 pm CST
6:00 pm AST
5:00 pm CST
7:00 pm AST
6:00 pm CST
8:00 pm AST
7:00 pm CST
9:00 pm AST
8:00 pm CST
10:00 pm AST
9:00 pm CST
11:00 pm AST
10:00 pm CST
12:00 am AST+1 day
11:00 pm CST
1:00 am AST+1 day

Scheduling between the two

Working hours overlap from 9:00 am to 4:00 pm CST, which is 11:00 am to 6:00 pm AST. Anything inside that window falls in the normal working day at both ends.

A note on CST: it can also mean China Standard Time (UTC+8) and Cuba Standard Time (UTC−5). This page means US Central Time.

A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.

Central Time (CST) is used in Dallas, Houston, Mexico City and Winnipeg

Atlantic Time (AST) is used in Nova Scotia, New Brunswick and Puerto Rico

Other conversions