AST to PST
On Oct 23, 2026, Pacific Time is 4 hours behind Atlantic Time: 9:00 AM ADT is 5:00 AM PDT. The gap changes during the year because of daylight saving time; the dates are below.
PST vs AST over the next 12 months
| Period | PST is | Example |
|---|---|---|
| Oct 23, 2026 to Nov 1, 2026 | 4 hours behind | 9:00 AM ADT = 5:00 AM PDT |
| Nov 1, 2026 to Nov 1, 2026 | 3 hours behind | 9:00 AM AST = 5:00 AM PST |
| Nov 1, 2026 to Mar 14, 2027 | 4 hours behind | 9:00 AM AST = 5:00 AM PST |
| Mar 14, 2027 to Mar 14, 2027 | 5 hours behind | 9:00 AM ADT = 5:00 AM PDT |
| Mar 14, 2027 onwards | 4 hours behind | 9:00 AM ADT = 5:00 AM PDT |
AST to PST conversion table
Every hour of a weekday around Oct 23, 2026, in both zones.
| Atlantic Time | Pacific Time |
|---|---|
| 12:00 AM | 8:00 PM (previous day) |
| 1:00 AM | 9:00 PM (previous day) |
| 2:00 AM | 10:00 PM (previous day) |
| 3:00 AM | 11:00 PM (previous day) |
| 4:00 AM | 12:00 AM |
| 5:00 AM | 1:00 AM |
| 6:00 AM | 2:00 AM |
| 7:00 AM | 3:00 AM |
| 8:00 AM | 4:00 AM |
| 9:00 AM | 5:00 AM |
| 10:00 AM | 6:00 AM |
| 11:00 AM | 7:00 AM |
| 12:00 PM | 8:00 AM |
| 1:00 PM | 9:00 AM |
| 2:00 PM | 10:00 AM |
| 3:00 PM | 11:00 AM |
| 4:00 PM | 12:00 PM |
| 5:00 PM | 1:00 PM |
| 6:00 PM | 2:00 PM |
| 7:00 PM | 3:00 PM |
| 8:00 PM | 4:00 PM |
| 9:00 PM | 5:00 PM |
| 10:00 PM | 6:00 PM |
| 11:00 PM | 7:00 PM |
Best time for a meeting
Normal 9-to-5 working hours overlap for 4 hours on a weekday: 1:00 PM–5:00 PM ADT, which is 9:00 AM–1:00 PM PDT.
Comparing more than two places? The meeting planner lines up working hours for up to six cities.
Daylight saving time
Atlantic Time (AST/ADT)
- Nov 1, 2026: clocks go back 1 hour at 2:00 AM (UTC−3 → UTC−4)
- Mar 14, 2027: clocks go forward 1 hour at 2:00 AM (UTC−4 → UTC−3)
Pacific Time (PST/PDT)
- Nov 1, 2026: clocks go back 1 hour at 2:00 AM (UTC−7 → UTC−8)
- Mar 14, 2027: clocks go forward 1 hour at 2:00 AM (UTC−8 → UTC−7)
Where these clocks are used
- Atlantic Time (AST/ADT): Nova Scotia, New Brunswick, Prince Edward Island. IANA zone
America/Halifax. - Pacific Time (PST/PDT): Los Angeles, San Francisco, Seattle, Vancouver. IANA zone
America/Los_Angeles.
Questions
What time is it in PST when it is 9 AM AST?
On Oct 23, 2026, 9:00 AM ADT is 5:00 AM PDT. On other dates the answer can shift by an hour because of daylight saving time; the table of periods on this page gives each one.
How many hours behind AST is PST?
It depends on the date. Oct 23, 2026 to Nov 1, 2026: PST is 4 hours behind. Nov 1, 2026 to Nov 1, 2026: PST is 3 hours behind. Nov 1, 2026 to Mar 14, 2027: PST is 4 hours behind. Mar 14, 2027 to Mar 14, 2027: PST is 5 hours behind. Mar 14, 2027 onwards: PST is 4 hours behind.
Do AST and PST observe daylight saving time?
Atlantic Time switches to ADT (UTC−3) in summer and back to AST (UTC−4) in winter. Pacific Time switches to PDT (UTC−7) in summer and back to PST (UTC−8) in winter.
What is the best time for a meeting between AST and PST?
Normal 9-to-5 working hours overlap for 4 hours on a weekday: 1:00 PM–5:00 PM ADT, which is 9:00 AM–1:00 PM PDT.
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Related conversions
- PST to AST (reverse)
- EST to PST
- CST to PST
- MST to PST
- UTC to PST
- GMT to PST
- CET to PST
- IST to PST
- SGT to PST
- JST to PST
- AEST to PST
- AKST to PST
- All time zones
Computed from the IANA time zone database on Oct 23, 2026. Live clocks and the converter use your browser's copy of the same data.