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PST to AST: Pacific Time to Atlantic Time

4 hours ahead of PST

AST compared with PST, right now. Swap: AST to PST ⇄

PSTTuesday, November 3, 2026PST · UTC−8ASTTuesday, November 3, 2026AST · UTC−4

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PST to AST conversion table

For Tuesday, November 3, 2026. Rows where both places are inside 9 AM–5 PM are highlighted.

PSTAST
12:00 AM4:00 AM
1:00 AM5:00 AM
2:00 AM6:00 AM
3:00 AM7:00 AM
4:00 AM8:00 AM
5:00 AM9:00 AM
6:00 AM10:00 AM
7:00 AM11:00 AM
8:00 AM12:00 PM
9:00 AM1:00 PM
10:00 AM2:00 PM
11:00 AM3:00 PM
12:00 PM4:00 PM
1:00 PM5:00 PM
2:00 PM6:00 PM
3:00 PM7:00 PM
4:00 PM8:00 PM
5:00 PM9:00 PM
6:00 PM10:00 PM
7:00 PM11:00 PM
8:00 PM12:00 AM (next day)
9:00 PM1:00 AM (next day)
10:00 PM2:00 AM (next day)
11:00 PM3:00 AM (next day)

About these time zones

PST: Pacific Standard Time

Pacific Time (PST/PDT). Los Angeles, San Francisco, Seattle, Portland, Las Vegas and Vancouver. PST is UTC−8; in summer the region uses PDT, UTC−7.

Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−8 → UTC−7).

AST: Atlantic Standard Time

Atlantic Time (AST/ADT). Nova Scotia, New Brunswick and Prince Edward Island (with daylight saving), plus Puerto Rico and much of the Caribbean, which stay on AST (UTC−4) all year.

Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−4 → UTC−3).

Questions about PST and AST time

What is the time difference between PST and AST?

The current difference is shown at the top of this page. PST uses Pacific Standard Time (PST, UTC−8) as standard time and Pacific Daylight Time (PDT, UTC−7) during daylight saving time; AST uses Atlantic Standard Time (AST, UTC−4) as standard time and Atlantic Daylight Time (ADT, UTC−3) during daylight saving time. The difference can change if only one side observes daylight saving time or if their clocks change on different dates. Choose your meeting date in the converter to check the applicable offset.

When it is 9:00 AM in PST, what time is it in AST?

On Tuesday, November 3, 2026, 9:00 AM in PST was 1:00 PM in AST. The conversion table above shows today’s values.

Do the clocks change in PST or AST?

PST: Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−8 → UTC−7). AST: Sunday, March 14, 2027: clocks go forward 1 hour at 2:00 AM local time (UTC−4 → UTC−3).

Is PST the same as PDT?

PST is the standard-time name and PDT the daylight-saving name for Pacific Time. People often say PST all year; this converter uses the time actually in effect on the date you choose.

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