PST to AST Converter
AST is 4 hours ahead of PST. 9:00 AM PST = 1:00 PM AST.
AST is 4 hours ahead of PST. To convert PST to AST, add 4 hours to the PST time: 9:00 AM PST = 1:00 PM AST.
PST (Pacific Time) is used in Los Angeles, San Francisco, Seattle, Las Vegas, Portland, Vancouver. AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year).
PST here means Pacific Standard Time, not Philippine Standard Time. AST here is Atlantic Standard Time, not Arabia Standard Time.
PST to AST time conversion table
PST to AST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| PST | AST |
|---|---|
| 12:00 AM | 4:00 AM |
| 1:00 AM | 5:00 AM |
| 2:00 AM | 6:00 AM |
| 3:00 AM | 7:00 AM |
| 4:00 AM | 8:00 AM |
| 5:00 AM | 9:00 AM |
| 6:00 AM | 10:00 AM |
| 7:00 AM | 11:00 AM |
| PST | AST |
|---|---|
| 8:00 AM | 12:00 PM |
| 9:00 AM | 1:00 PM |
| 10:00 AM | 2:00 PM |
| 11:00 AM | 3:00 PM |
| 12:00 PM | 4:00 PM |
| 1:00 PM | 5:00 PM |
| 2:00 PM | 6:00 PM |
| 3:00 PM | 7:00 PM |
| PST | AST |
|---|---|
| 4:00 PM | 8:00 PM |
| 5:00 PM | 9:00 PM |
| 6:00 PM | 10:00 PM |
| 7:00 PM | 11:00 PM |
| 8:00 PM | 12:00 AM+1 |
| 9:00 PM | 1:00 AM+1 |
| 10:00 PM | 2:00 AM+1 |
| 11:00 PM | 3:00 AM+1 |
Conversion table from PST to AST for 7 Nov 2026. A tick marks hours that fall between 9 AM and 5 PM in both places. +1 means the next day in AST, −1 the previous day.
- ✓ marks 9 AM–5 PM in both places
- Greyed times are night in the destination (10 PM–6 AM)
How to convert PST to AST
Add 4 hours to the PST time to get AST.
Example: 9:00 AM PST = 1:00 PM AST.
Across midnight: 10:00 PM PST = 2:00 AM AST (next day). The date changes, so always check the day as well as the hour.
Time difference between PST and AST
The time difference between PST and AST is 4 hours all year – AST is ahead of PST.
PST and AST during daylight saving time
- PST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from PST (UTC−8) to PDT (UTC−7).
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
Best time for a meeting between PST and AST
PST and AST share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM PST lands between 1:00 PM and 5:00 PM AST, inside working hours for both.
PST to AST FAQ
What is the time difference between PST and AST?
AST is 4 hours ahead of PST all year. 9:00 AM PST = 1:00 PM AST.
What is 9 AM PST in AST?
9:00 AM PST is 1:00 PM AST.
What is 12 PM (noon) PST in AST?
12:00 PM PST is 4:00 PM AST.
Is AST ahead of or behind PST?
AST is 4 hours ahead of PST, so it is later in AST than in PST.
Does PST change for daylight saving time?
Yes. PST next changes on 14 Mar 2027, when clocks go forward one hour from PST to PDT.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
What is the best time for a meeting between PST and AST?
PST and AST share 4 hours of the 9 AM–5 PM working day. Any time between 9:00 AM and 1:00 PM PST lands between 1:00 PM and 5:00 PM AST, inside working hours for both.
Is PT the same as PST?
PST is the winter (standard) name of Pacific Time (PT). From March to November the same clocks are called PDT. This converter always uses the one in force on the date you choose.
Related conversions
Convert AST to PST
Convert PST to other time zones
Convert other time zones to AST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.