Ciudad Obregon to AST Time Converter
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Quick answers
Selected conversion
5:00 am05:00 MST (UTC-7), Oct 20, 2026 = 9:00 am09:00 ADT (UTC-3), Oct 20, 2026
Ciudad Obregón is 4 hours behind ADT.
How the time difference changes
For most of the year, Ciudad Obregon is 4 hours behind ADT. From Nov 1, 2026 to Mar 14, 2027, Ciudad Obregon is 3 hours behind AST.
For most of the year, working hours of 9:00 am to 6:00 pm in Ciudad Obregon 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 Ciudad Obregon correspond to 12:00 pm to 9:00 pm in AST.For most of the year, working hours of 09:00 to 18:00 in Ciudad Obregon correspond to 13:00 to 22:00 in ADT. At other times of the year, working hours of 09:00 to 18:00 in Ciudad Obregon correspond to 12:00 to 21:00 in AST.
Compare Ciudad Obregon time with AST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
MST (Mexican Pacific Standard Time) is 4 hours behind Atlantic Daylight Time.
5:00 am05:00 in Ciudad Obregon, Mexico is 9:00 am09:00 in ADT
Ciudad Obregón to ADT call time
Best time for a conference call or a meeting is between 9am-2pm09:00-14:00 in Ciudad Obregón which corresponds to 1pm-6pm13:00-18:00 in ADT
5:00 am05:00 MST (Mexican Pacific Standard Time) (Ciudad Obregon, Mexico). Offset UTC -7:00 hours
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
5:00 am05:00 Ciudad Obregon, Mexico / 9:00 am09:00 ADT
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Ciudad Obregón Time Zone and Facts
Time Zone
Ciudad Obregón 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