What is PST in AST?
Atlantic Time is 4 hours ahead
Pacific Time is on UTC−7:00 and Atlantic Time is on UTC−3:00 right now. Both are on daylight saving, so their clocks read PDT and ADT. That gap holds all year, because both zones change their clocks together.
- Time in Los Angeles
- 7:56 pm
- Time in Halifax
- 11:56 pm
- Difference
- +4 h
- Next clock change
- November 1, 2026
Convert a time
ADT — Atlantic Time
11:00 pm
Tue
Daylight saving
Pacific Time
Clocks go back one hour at 2am local time, becoming PST.
Atlantic Time
Clocks go back one hour at 2am local time, becoming AST.
PST to AST conversion table
Every hour of Tuesday, September 22, 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 PDT
- 4:00 am ADT
- 1:00 am PDT
- 5:00 am ADT
- 2:00 am PDT
- 6:00 am ADT
- 3:00 am PDT
- 7:00 am ADT
- 4:00 am PDT
- 8:00 am ADT
- 5:00 am PDT
- 9:00 am ADT
- 6:00 am PDT
- 10:00 am ADT
- 7:00 am PDT
- 11:00 am ADT
- 8:00 am PDT
- 12:00 pm ADT
- 9:00 am PDT
- 1:00 pm ADT
- 10:00 am PDT
- 2:00 pm ADT
- 11:00 am PDT
- 3:00 pm ADT
- 12:00 pm PDT
- 4:00 pm ADT
- 1:00 pm PDT
- 5:00 pm ADT
- 2:00 pm PDT
- 6:00 pm ADT
- 3:00 pm PDT
- 7:00 pm ADT
- 4:00 pm PDT
- 8:00 pm ADT
- 5:00 pm PDT
- 9:00 pm ADT
- 6:00 pm PDT
- 10:00 pm ADT
- 7:00 pm PDT
- 11:00 pm ADT
- 8:00 pm PDT
- 12:00 am ADT+1 day
- 9:00 pm PDT
- 1:00 am ADT+1 day
- 10:00 pm PDT
- 2:00 am ADT+1 day
- 11:00 pm PDT
- 3:00 am ADT+1 day
Scheduling between the two
Working hours overlap from 9:00 am to 2:00 pm PDT, which is 1:00 pm to 6:00 pm ADT. 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 (PDT) is used in San Francisco, Seattle, Las Vegas and Vancouver
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico