Riyadh to AST Time Converter
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Quick answers
Selected conversion
3:00 pm15:00 AST (UTC+3), Oct 18, 2026 = 9:00 am09:00 ADT (UTC-3), Oct 18, 2026
Riyadh is 6 hours ahead of ADT.
How the time difference changes
For most of the year, Riyadh is 6 hours ahead of ADT. From Nov 1, 2026 to Mar 14, 2027, Riyadh is 7 hours ahead of AST.
For most of the year, working hours of 9:00 am to 6:00 pm in Riyadh correspond to 3:00 am to 12:00 pm in ADT. At other times of the year, working hours of 9:00 am to 6:00 pm in Riyadh correspond to 2:00 am to 11:00 am in AST.For most of the year, working hours of 09:00 to 18:00 in Riyadh correspond to 03:00 to 12:00 in ADT. At other times of the year, working hours of 09:00 to 18:00 in Riyadh correspond to 02:00 to 11:00 in AST.
Compare Riyadh time with AST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
AST (Arabia Standard Time) is 6 hours ahead of Atlantic Daylight Time.
3:00 pm15:00 in Riyadh, Saudi Arabia is 9:00 am09:00 in ADT
Riyadh to ADT call time
Best time for a conference call or a meeting is between 3pm-6pm15:00-18:00 in Riyadh which corresponds to 9am-12pm09:00-12:00 in ADT
3:00 pm15:00 AST (Arabia Standard Time) (Riyadh, Saudi Arabia). Offset UTC +3:00 hours
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
3:00 pm15:00 Riyadh, Saudi Arabia / 9:00 am09:00 ADT
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Riyadh Time Zone and Facts
Time Zone
Riyadh Facts
Atlantic Standard Time
Offset: AST is 4 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Anguilla, Antigua and Barbuda, Aruba, Barbados, Bermuda, British Virgin Islands, Canada, Caribbean Netherlands, Curaçao, Dominica, Dominican Republic, Greenland, Grenada, Guadeloupe, Martinique, Montserrat, Puerto Rico, Saint Barthélemy, Saint Kitts and Nevis, Saint Lucia, Saint Martin, Saint Vincent and the Grenadines, Sint Maarten, Trinidad and Tobago, US Virgin Islands
Principal Cities: The largest city in the AST time zone is Santo Domingo in the Dominican Republic, with about 2.202 million people. Other major cities in this time zone include Santiago de los Caballeros, Halifax, San Juan, San Pedro de Macorís.
French: HNA - Heure Normale de l'Atlantique
Spanish: AST - Tiempo Estándar del Atlántico
Today the lighter areas are on UTC−3 (ADT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Atlantic Daylight Time (ADT).
End: Atlantic Standard Time (AST) ended 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 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Atlantic Standard Time (AST) starts 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. Standard time starts annually on the first Sunday of November.
See Canada daylight saving time and upcoming clock changes worldwide.
AST representations, usage and related time zones
- -04 - basic short
- -0400 - basic
- -04:00 - extended
- -0400 - sign character (-) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the west of the zero meridian.
- Quebec - Military abbreviation for AST
- Q - short form of 'Quebec'
- America/Anguilla
- America/Antigua
- America/Aruba
- America/Barbados
- America/Blanc-Sablon
- America/Curacao
- America/Dominica
- America/Glace_Bay
- America/Goose_Bay
- America/Grenada
- America/Guadeloupe
- America/Halifax
- America/Kralendijk
- America/Lower_Princes
- America/Marigot
- America/Martinique
- America/Moncton
- America/Montserrat
- America/Port_of_Spain
- America/Puerto_Rico
- America/Santo_Domingo
- America/St_Barthelemy
- America/St_Kitts
- America/St_Lucia
- America/St_Thomas
- America/St_Vincent
- America/Thule
- America/Tortola
- America/Virgin
- Atlantic/Bermuda
- Canada/Atlantic
- Atlantic Standard Time - UTC -4
- Arabia Standard Time - UTC +3
- AST - Atlantic Standard Time
- EDT - Eastern Daylight Time
- AMT - Amazon Time
- BOT - Bolivia Time
- CDT - Cuba Daylight Time
- CLT - Chile Standard Time
- GYT - Guyana Time
- HLV - Hora Legal de Venezuela
- Q - Quebec Time Zone
- VET - Venezuelan Standard Time