What is AST in PST?
Pacific Time is 4 hours behind
Atlantic Time is on UTC−3:00 and Pacific Time is on UTC−7:00 right now. Both are on daylight saving, so their clocks read ADT and PDT. That gap holds all year, because both zones change their clocks together.
- Time in Halifax
- 11:13 pm
- Time in Los Angeles
- 7:13 pm
- Difference
- −4 h
- Next clock change
- November 1, 2026
Convert a time
PDT — Pacific Time
7:00 pm
Tue
Daylight saving
Atlantic Time
Clocks go back one hour at 2am local time, becoming AST.
Pacific Time
Clocks go back one hour at 2am local time, becoming PST.
AST to PST conversion table
Every hour of Tuesday, September 22, 2026, converted from Atlantic Time to Pacific Time. 4 of the 24 hours fall on a different calendar day in Los Angeles, which is marked.
- 12:00 am ADT
- 8:00 pm PDT−1 day
- 1:00 am ADT
- 9:00 pm PDT−1 day
- 2:00 am ADT
- 10:00 pm PDT−1 day
- 3:00 am ADT
- 11:00 pm PDT−1 day
- 4:00 am ADT
- 12:00 am PDT
- 5:00 am ADT
- 1:00 am PDT
- 6:00 am ADT
- 2:00 am PDT
- 7:00 am ADT
- 3:00 am PDT
- 8:00 am ADT
- 4:00 am PDT
- 9:00 am ADT
- 5:00 am PDT
- 10:00 am ADT
- 6:00 am PDT
- 11:00 am ADT
- 7:00 am PDT
- 12:00 pm ADT
- 8:00 am PDT
- 1:00 pm ADT
- 9:00 am PDT
- 2:00 pm ADT
- 10:00 am PDT
- 3:00 pm ADT
- 11:00 am PDT
- 4:00 pm ADT
- 12:00 pm PDT
- 5:00 pm ADT
- 1:00 pm PDT
- 6:00 pm ADT
- 2:00 pm PDT
- 7:00 pm ADT
- 3:00 pm PDT
- 8:00 pm ADT
- 4:00 pm PDT
- 9:00 pm ADT
- 5:00 pm PDT
- 10:00 pm ADT
- 6:00 pm PDT
- 11:00 pm ADT
- 7:00 pm PDT
Scheduling between the two
Working hours overlap from 1:00 pm to 6:00 pm ADT, which is 9:00 am to 2:00 pm PDT. 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.
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
Pacific Time (PDT) is used in San Francisco, Seattle, Las Vegas and Vancouver