ACST to AST converter

Australian Central Time (Adelaide) to Atlantic Time (Halifax).

ACST10:37 AMSat 31 Oct 2026

→

AST9:07 PMFri 30 Oct 2026

AST is 13 h 30 min behind ACST.

Pick a time in ACST

⇄ AST to ACST

9:00 AM ACST = 7:30 PM AST previous day

Best time to meet

No hour falls inside 9 AM to 5 PM in both places. The least painful: around 9:00 AM ACST, which is 7:30 PM AST.

ACST to AST time table

For 31 Oct 2026. Green rows: both sides between 9 AM and 5 PM.

ACST	AST
12:00 AM ACST	10:30 AM AST previous day
1:00 AM ACST	11:30 AM AST previous day
2:00 AM ACST	12:30 PM AST previous day
3:00 AM ACST	1:30 PM AST previous day
4:00 AM ACST	2:30 PM AST previous day
5:00 AM ACST	3:30 PM AST previous day
6:00 AM ACST	4:30 PM AST previous day
7:00 AM ACST	5:30 PM AST previous day
8:00 AM ACST	6:30 PM AST previous day
9:00 AM ACST	7:30 PM AST previous day
10:00 AM ACST	8:30 PM AST previous day
11:00 AM ACST	9:30 PM AST previous day
12:00 PM ACST	10:30 PM AST previous day
1:00 PM ACST	11:30 PM AST previous day
2:00 PM ACST	12:30 AM AST
3:00 PM ACST	1:30 AM AST
4:00 PM ACST	2:30 AM AST
5:00 PM ACST	3:30 AM AST
6:00 PM ACST	4:30 AM AST
7:00 PM ACST	5:30 AM AST
8:00 PM ACST	6:30 AM AST
9:00 PM ACST	7:30 AM AST
10:00 PM ACST	8:30 AM AST
11:00 PM ACST	9:30 AM AST

Quick answers

9:00 AM ACST = 7:30 PM AST (previous day)
12:00 PM ACST = 10:30 PM AST (previous day)
3:00 PM ACST = 1:30 AM AST
5:00 PM ACST = 3:30 AM AST
9:00 AM AST = 10:30 PM ACST
12:00 PM AST = 1:30 AM ACST (next day)
5:00 PM AST = 6:30 AM ACST (next day)

Does the gap change during the year?

Yes, because of daylight saving. Until 1 Nov 2026: AST is 13 h 30 min behind ACST. From 1 Nov 2026 to 14 Mar 2027: AST is 14 h 30 min behind ACST. From 14 Mar 2027 to 4 Apr 2027: AST is 13 h 30 min behind ACST. From 4 Apr 2027 to 3 Oct 2027: AST is 12 h 30 min behind ACST. From 3 Oct 2027 to 7 Nov 2027: AST is 13 h 30 min behind ACST.

ACST next changes its clocks on 4 Apr 2027 (back 1 h, to UTC+9:30), then on 3 Oct 2027 (forward 1 h, to UTC+10:30). AST next changes its clocks on 1 Nov 2026 (back 1 h, to UTC−4), then on 14 Mar 2027 (forward 1 h, to UTC−3).

About ACST and AST

ACST here means Australian Central Time, the clock in Adelaide. Right now it is UTC+10:30. Strictly, ACST is the winter name; in summer these places use ACDT. This page follows their real clock all year.

AST here means Atlantic Time, the clock in Halifax. Right now it is UTC−3. Strictly, AST is the winter name; in summer these places use ADT. This page follows their real clock all year.

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