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DateAlmanac

What is PST in AST?

Atlantic Time is 4 hours ahead

Pacific Time is on UTC−8:00 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 Los Angeles
12:28:59 AM
Time in Halifax
4:28:59 AM
Difference
+4 h
Next clock change
March 14, 2027

Daylight saving

Pacific Time

Sunday, March 14, 2027

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

PST to AST conversion table

Every hour of Saturday, November 7, 2026, converted from Pacific Time to Atlantic Time. 4 of the 24 hours fall on a different calendar day in Halifax, which is marked.

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

Scheduling between the two

Working hours overlap from 9:00 am to 2:00 pm PST, which is 1:00 pm to 6:00 pm AST. Anything inside that window falls in the normal working day at both ends.

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

Pacific Time (PST) is used in San Francisco, Seattle, Las Vegas and Vancouver

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

Other conversions