PT to ADT Converter
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Quick answers
Selected conversion
8:30 am08:30 PT (UTC-8), Nov 1, 2026 = 12:30 pm12:30 AST (UTC-4), Nov 1, 2026
PT is 4 hours behind AST.
How the time difference changes
For most of the year, PT is 4 hours behind ADT. From Nov 1, 2026 to Mar 14, 2027, PT is 4 hours behind AST. Briefly around clock changes, PT is 3 hours behind AST or PT is 5 hours behind ADT.
For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 1:00 pm to 10:00 pm in ADT. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 1:00 pm to 10:00 pm in AST.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 13:00 to 22:00 in ADT. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 13:00 to 22:00 in AST.
Compare PT time with ADT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Pacific Time is 4 hours behind Atlantic Standard Time.
8:30 am08:30 in PT is 12:30 pm12:30 in AST
PT to AST call time
Best time for a conference call or a meeting is between 9am-2pm09:00-14:00 in PT which corresponds to 1pm-6pm13:00-18:00 in AST
8:30 am08:30 Pacific Time (PT). Offset UTC -8:00 hours
12:30 pm12:30 Atlantic Standard Time (AST). Offset UTC -4:00 hours
8:30 am08:30 PT / 12:30 pm12:30 AST
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| PT | AST |
|---|---|
| 3:00am | |
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| 03:00 | |
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Pacific Time
Pacific Time (PT) is a general term used to describe the areas that observe either the Pacific Standard Time (PST) or Pacific Daylight Time (PDT) in North America. PT also called Pacific Coast Time. PT is not static but switches between PDT and PST.
Territories observing the Pacific Time Zone are primarily in North America. It runs through the western United States and the Northwestern part of Mexico. From November 1, 2026, most of British Columbia in Canada keeps UTC-7 all year instead.
Countries using this time zone: Mexico, United States
Principal Cities: The largest city in the PT time zone is Los Angeles in the United States, with about 3.821 million people. Other major cities in this time zone include Tijuana, San Diego, Mexicali, San Jose.
French: HNP - Heure Normale du Pacifique
Spanish: PT - Tiempo del Pacífico, PT - Zona Noroeste
PT representations, usage and related time zones
- -08 - basic short
- -0800 - basic
- -08:00 - extended
- -0800 - sign character (-) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the west of the zero meridian.
- Uniform - Military abbreviation for PT
- U - short form of 'Uniform'
- AKDT - Alaska Daylight Time
- PST - Pacific Standard Time
- PT - Pacific Time
- PST - Pitcairn Standard Time
- U - Uniform Time Zone
Atlantic Daylight Time
Offset: ADT is 3 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Bermuda, Canada, Greenland
Principal Cities: The largest city in the ADT time zone is Halifax in Canada, with about 471,559 people. Other major cities in this time zone include Sydney, Moncton, Saint John, Fredericton.
French: HAA - Heure Avancée de l'Atlantique
Today the shaded areas are on UTC−4 (Atlantic Standard Time).
Daylight Saving: Atlantic Daylight Time (ADT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Atlantic Standard Time (AST).
End: Atlantic Daylight Time (ADT) ended on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
Start: Atlantic Daylight Time (ADT) starts on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
See Canada daylight saving time and upcoming clock changes worldwide.
ADT representations, usage and related time zones
- -03 - basic short
- -0300 - basic
- -03:00 - extended
- -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the west of the zero meridian.
- Papa - Military abbreviation for ADT
- P - short form of 'Papa'
- America/Glace_Bay
- America/Goose_Bay
- America/Halifax
- America/Moncton
- America/Thule
- Atlantic/Bermuda
- Canada/Atlantic
- ADT - Atlantic Daylight Time
- PMT - Pierre & Miquelon Standard Time
- PMST - Pierre & Miquelon Standard Time
- AMST - Amazon Summer Time
- ART - Argentina Time
- BRT - Brasilia Time
- CLST - Chile Summer Time
- FKST - Falkland Islands Summer Time
- FKT - Falkland Islands Time
- GFT - French Guiana Time
- P - Papa Time Zone
- PYST - Paraguay Summer Time
- PYT - Paraguay Time
- SRT - Suriname Time
- UYT - Uruguay Time