AST to CST Converter

Time Difference

Atlantic Standard Time is 1 hour ahead of Central Daylight Time
So 8:30 pm20:30 in AST is 7:30 pm19:30 in CDT

8:30 pm20:30 Atlantic Standard Time (AST). Offset UTC -4:00 hours
7:30 pm19:30 Central Daylight Time (CDT). Offset UTC -5:00 hours

8:30 pm20:30 AST / 7:30 pm19:30 CDT

Atlantic Standard Time

Offset: AST is 4 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Antigua & Barbuda, Anguilla, Aruba, Barbados, St Barthelemy, Bermuda, Caribbean NL, Canada, Curaçao, Dominica, Dominican Republic, Grenada, Greenland, Guadeloupe, St Kitts & Nevis, St Lucia, St Martin (French), Martinique, Montserrat, Puerto Rico, St Maarten (Dutch), Trinidad & Tobago, St Vincent, Virgin Islands (UK), Virgin Islands (US)

Principal Cities: The largest city in the AST timezone is Santo Domingo from Dominican Republic with population about 2.202 million people. Other major cities in the area are Santiago de los Caballeros, Santo Domingo Oeste, San Juan, Halifax

Daylight Saving: This is a standard timezone, however during summer some places adjust time for one hour forward for daylight saving and observe Atlantic Daylight Time (ADT).

End: AST ends annually on the same date and time. and clocks were set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

Start: AST starts annually on the same date and time. and clocks are set one hour back on Sunday, November 1, 2020, at 2:00 (2:00 am) local time.

French: HNA - Heure Normale de l'Atlantique

Spanish: AST - Tiempo Estándar del Atlántico

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 four hour and zero minutes time differences 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

AST Abbreviation: Several time zones share AST abbreviation and it could refer to these time zones

• Atlantic Standard Time - UTC -4
• Arabia Standard Time - UTC +3

Time zones with the GMT -4 offset:

• AST - Atlantic Standard Time
• EDT - Eastern Daylight Time
• AMT - Amazon Time
• BOT - Bolivia Time
• CDT - Cuba Daylight Time
• CLT - Chile Standard Time
• FKT - Falkland Island Time
• GYT - Guyana Time
• PYT - Paraguay Time
• Q - Quebec Time Zone
• VET - Venezuelan Standard Time
• -04 -

Central Standard Time

Offset: CST is 6 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Belize, Canada, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, El Salvador, United States

Principal Cities: The largest city in the CST timezone is Mexico City from Mexico with population about 12.294 million people. Other major cities in the area are Chicago, Houston, Iztapalapa, Ecatepec

Daylight Saving: This is a standard timezone, however during summer some places adjust time for one hour forward for daylight saving and observe Central Daylight Time (CDT).

End: CST ends annually on the same date and time. and clocks were set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

Start: CST starts annually on the same date and time. and clocks are set one hour back on Sunday, November 1, 2020, at 2:00 (2:00 am) local time.

French: HNC - Heure Normale du Centre

Spanish: CT - Tiempo Central Estándar, CT - Zona Centro

CST representations, usage and related time zones

• -06 - basic short
• -0600 - basic
• -06:00 - extended

• -0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates six hour and zero minutes time differences to the west of the zero meridian.

• Sierra - Military abbreviation for CST
• S - short form of 'Sierra'

• America/Bahia_Banderas
• America/Belize
• America/Chicago
• America/Costa_Rica
• America/El_Salvador
• America/Guatemala
• America/Indiana/Knox
• America/Indiana/Tell_City
• America/Knox_IN
• America/Managua
• America/Matamoros
• America/Menominee
• America/Merida
• America/Mexico_City
• America/Monterrey
• America/North_Dakota/Beulah
• America/North_Dakota/Center
• America/North_Dakota/New_Salem
• America/Rainy_River
• America/Rankin_Inlet
• America/Regina
• America/Resolute
• America/Swift_Current
• America/Tegucigalpa
• America/Winnipeg
• CST6CDT
• Canada/Central
• Canada/Saskatchewan
• Mexico/General
• US/Central
• US/Indiana-Starke

CST Abbreviation: Several time zones share CST abbreviation and it could refer to these time zones

• Central Standard Time - UTC -6
• China Standard Time - UTC +8
• Cuba Standard Time - UTC -5

Time zones with the GMT -6 offset:

• CST - Central Standard Time
• CT - Central Time
• MDT - Mountain Daylight Time
• EAST - Easter Island Standard Time
• GALT - Galapagos Time
• S - Sierra Time Zone
• -06 -
• MWT -