ADT to San Juan, Puerto Rico Time Converter
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Quick answers
Selected conversion
9:00 am09:00 ADT (UTC-3), Oct 15, 2026 = 8:00 am08:00 AST (UTC-4), Oct 15, 2026
ADT is 1 hour ahead of San Juan.
How the time difference changes
For most of the year, ADT is 1 hour ahead of San Juan, Puerto Rico. From Nov 1, 2026 to Mar 14, 2027, AST and San Juan, Puerto Rico have the same time.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 8:00 am to 5:00 pm in San Juan, Puerto Rico. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 9:00 am to 6:00 pm in San Juan, Puerto Rico.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 08:00 to 17:00 in San Juan, Puerto Rico. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 09:00 to 18:00 in San Juan, Puerto Rico.
Compare ADT time with San Juan time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Atlantic Daylight Time is 1 hour ahead of AST (Atlantic Standard Time).
9:00 am09:00 in ADT is 8:00 am08:00 in San Juan, Puerto Rico
ADT to San Juan call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in ADT which corresponds to 9am-5pm09:00-17:00 in San Juan
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
8:00 am08:00 AST (Atlantic Standard Time) (San Juan, Puerto Rico). Offset UTC -4:00 hours
9:00 am09:00 ADT / 8:00 am08:00 San Juan, Puerto Rico
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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 all shaded areas are on ADT.
Daylight Saving: Atlantic Daylight Time (ADT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Atlantic Standard Time (AST).
Start: Atlantic Daylight Time (ADT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
End: Atlantic Daylight Time (ADT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are 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.
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 - Brasília time
- CLST - Chile Summer Time
- FKST - Falkland Islands Summer Time
- GFT - French Guiana Time
- P - Papa Time Zone
- PYST - Paraguay Summer Time
- SRT - Suriname Time
- UYT - Uruguay Time