ADT to Riyadh Time Converter
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Quick answers
Selected conversion
9:00 am09:00 ADT (UTC-3), Oct 18, 2026 = 3:00 pm15:00 AST (UTC+3), Oct 18, 2026
ADT is 6 hours behind Riyadh.
How the time difference changes
For most of the year, ADT is 6 hours behind Riyadh. From Nov 1, 2026 to Mar 14, 2027, AST is 7 hours behind Riyadh.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 3:00 pm to 12:00 am (next day) in Riyadh. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 4:00 pm to 1:00 am (next day) in Riyadh.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 15:00 to 00:00 (next day) in Riyadh. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 16:00 to 01:00 (next day) in Riyadh.
Compare ADT time with Riyadh time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Atlantic Daylight Time is 6 hours behind AST (Arabia Standard Time).
9:00 am09:00 in ADT is 3:00 pm15:00 in Riyadh, Saudi Arabia
ADT to Riyadh call time
Best time for a conference call or a meeting is between 9am-12pm09:00-12:00 in ADT which corresponds to 3pm-6pm15:00-18:00 in Riyadh
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
3:00 pm15:00 AST (Arabia Standard Time) (Riyadh, Saudi Arabia). Offset UTC +3:00 hours
9:00 am09:00 ADT / 3:00 pm15:00 Riyadh, Saudi Arabia
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| ADT | Riyadh, Saudi Arabia |
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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.
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