AST to MST to PDT to CST to EST Time Converter
Mountain Time is on daylight saving time: MDT (UTC−6) until Sun, Nov 1.
Arizona stays on MST (UTC−7).
Central Time is on daylight saving time: CDT (UTC−5) until Sun, Nov 1.
Mexico City and Saskatchewan stay on CST (UTC−6).
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
9:00 am09:00 ADT (UTC-3), Oct 30, 2026 = 6:00 am06:00 MDT (UTC-6), Oct 30, 2026 = 5:00 am05:00 PDT (UTC-7), Oct 30, 2026 = 7:00 am07:00 CDT (UTC-5), Oct 30, 2026 = 8:00 am08:00 EDT (UTC-4), Oct 30, 2026
ADT is 3 hours ahead of MDT. ADT is 4 hours ahead of PDT. ADT is 2 hours ahead of CDT. ADT is 1 hour ahead of EDT.
How the time difference changes
AST to MST
For most of the year, ADT is 3 hours ahead of MDT. From Nov 1, 2026 to Mar 14, 2027, AST is 3 hours ahead of MST. Briefly around clock changes, ADT is 4 hours ahead of MST or AST is 2 hours ahead of MDT.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 6:00 am to 3:00 pm in MDT. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 6:00 am to 3:00 pm in MST.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 06:00 to 15:00 in MDT. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 06:00 to 15:00 in MST.
AST to PDT
For most of the year, ADT is 4 hours ahead of PDT. From Nov 1, 2026 to Mar 14, 2027, AST is 4 hours ahead of PST. Briefly around clock changes, ADT is 5 hours ahead of PST or AST is 3 hours ahead of PDT.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 5:00 am to 2:00 pm in PDT. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 5:00 am to 2:00 pm in PST.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 05:00 to 14:00 in PDT. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 05:00 to 14:00 in PST.
AST to CST
For most of the year, ADT is 2 hours ahead of CDT. From Nov 1, 2026 to Mar 14, 2027, AST is 2 hours ahead of CST. Briefly around clock changes, ADT is 3 hours ahead of CST or AST is 1 hour ahead of CDT.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 7:00 am to 4:00 pm in CDT. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 7:00 am to 4:00 pm in CST.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 07:00 to 16:00 in CDT. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 07:00 to 16:00 in CST.
AST to EST
For most of the year, ADT is 1 hour ahead of EDT. From Nov 1, 2026 to Mar 14, 2027, AST is 1 hour ahead of EST. Briefly around clock changes, ADT is 2 hours ahead of EST or AST and EDT 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 EDT. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 8:00 am to 5:00 pm in EST.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 08:00 to 17:00 in EDT. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 08:00 to 17:00 in EST.
Compare AST time with MST, PDT, CST, and EST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Atlantic Daylight Time is 3 hours ahead of Mountain Daylight Time. Atlantic Daylight Time is 4 hours ahead of Pacific Daylight Time. Atlantic Daylight Time is 2 hours ahead of Central Daylight Time. Atlantic Daylight Time is 1 hour ahead of Eastern Daylight Time.
9:00 am09:00 in ADT is 6:00 am06:00 in MDT and is 5:00 am05:00 in PDT and is 7:00 am07:00 in CDT and is 8:00 am08:00 in EDT
ADT to MDT call time
Best time for a conference call or a meeting is between 12pm-6pm12:00-18:00 in ADT which corresponds to 9am-3pm09:00-15:00 in MDT
ADT to PDT call time
Best time for a conference call or a meeting is between 1pm-6pm13:00-18:00 in ADT which corresponds to 9am-2pm09:00-14:00 in PDT
ADT to CDT call time
Best time for a conference call or a meeting is between 11am-6pm11:00-18:00 in ADT which corresponds to 9am-4pm09:00-16:00 in CDT
ADT to EDT 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 EDT
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours
5:00 am05:00 Pacific Daylight Time (PDT). Offset UTC -7:00 hours
7:00 am07:00 Central Daylight Time (CDT). Offset UTC -5:00 hours
8:00 am08:00 Eastern Daylight Time (EDT). Offset UTC -4:00 hours
9:00 am09:00 ADT / 6:00 am06:00 MDT / 5:00 am05:00 PDT / 7:00 am07:00 CDT / 8:00 am08:00 EDT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| ADT | MDT | PDT | CDT | EDT |
|---|---|---|---|---|
| 9:00pm previous day | 8:00pm previous day | 10:00pm previous day | 11:00pm previous day | |
| 10:00pm previous day | 9:00pm previous day | 11:00pm previous day | 12:00am | |
| 11:00pm previous day | 10:00pm previous day | 12:00am | 1:00am | |
| 12:00am | 11:00pm previous day | 1:00am | 2:00am | |
| 1:00am | 12:00am | 2:00am | 3:00am | |
| 2:00am | 1:00am | 3:00am | 4:00am | |
| 3:00am | 2:00am | 4:00am | 5:00am | |
| 4:00am | 3:00am | 5:00am | 6:00am | |
| 5:00am | 4:00am | 6:00am | 7:00am | |
| 6:00am | 5:00am | 7:00am | 8:00am | |
| 7:00am | 6:00am | 8:00am | 9:00am | |
| 8:00am | 7:00am | 9:00am | 10:00am | |
| 9:00am | 8:00am | 10:00am | 11:00am | |
| 10:00am | 9:00am | 11:00am | 12:00pm | |
| 11:00am | 10:00am | 12:00pm | 1:00pm | |
| 12:00pm | 11:00am | 1:00pm | 2:00pm | |
| 1:00pm | 12:00pm | 2:00pm | 3:00pm | |
| 2:00pm | 1:00pm | 3:00pm | 4:00pm | |
| 3:00pm | 2:00pm | 4:00pm | 5:00pm | |
| 4:00pm | 3:00pm | 5:00pm | 6:00pm | |
| 5:00pm | 4:00pm | 6:00pm | 7:00pm | |
| 6:00pm | 5:00pm | 7:00pm | 8:00pm | |
| 7:00pm | 6:00pm | 8:00pm | 9:00pm | |
| 8:00pm | 7:00pm | 9:00pm | 10:00pm | |
| 21:00 previous day | 20:00 previous day | 22:00 previous day | 23:00 previous day | |
| 22:00 previous day | 21:00 previous day | 23:00 previous day | 00:00 | |
| 23:00 previous day | 22:00 previous day | 00:00 | 01:00 | |
| 00:00 | 23:00 previous day | 01:00 | 02:00 | |
| 01:00 | 00:00 | 02:00 | 03:00 | |
| 02:00 | 01:00 | 03:00 | 04:00 | |
| 03:00 | 02:00 | 04:00 | 05:00 | |
| 04:00 | 03:00 | 05:00 | 06:00 | |
| 05:00 | 04:00 | 06:00 | 07:00 | |
| 06:00 | 05:00 | 07:00 | 08:00 | |
| 07:00 | 06:00 | 08:00 | 09:00 | |
| 08:00 | 07:00 | 09:00 | 10:00 | |
| 09:00 | 08:00 | 10:00 | 11:00 | |
| 10:00 | 09:00 | 11:00 | 12:00 | |
| 11:00 | 10:00 | 12:00 | 13:00 | |
| 12:00 | 11:00 | 13:00 | 14:00 | |
| 13:00 | 12:00 | 14:00 | 15:00 | |
| 14:00 | 13:00 | 15:00 | 16:00 | |
| 15:00 | 14:00 | 16:00 | 17:00 | |
| 16:00 | 15:00 | 17:00 | 18:00 | |
| 17:00 | 16:00 | 18:00 | 19:00 | |
| 18:00 | 17:00 | 19:00 | 20:00 | |
| 19:00 | 18:00 | 20:00 | 21:00 | |
| 20:00 | 19:00 | 21:00 | 22:00 |
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
Mountain Standard Time
Offset: MST is 7 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Canada, Mexico, United States
Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.65 million people. Other major cities in this time zone include Ciudad Juárez, Hermosillo, Culiacán, Denver.
French: HNR - Heure Normale des Rocheuses
Spanish: MT - Zona Pacífico
Today the lighter areas are on UTC−6 (MDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).
End: Mountain Standard Time (MST) 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: Mountain Standard Time (MST) 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 USA daylight saving time and upcoming clock changes worldwide.
MST representations, usage and related time zones
- -07 - basic short
- -0700 - basic
- -07:00 - extended
- -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.
- Tango - Military abbreviation for MST
- T - short form of 'Tango'
- America/Boise
- America/Cambridge_Bay
- America/Ciudad_Juarez
- America/Creston
- America/Dawson
- America/Dawson_Creek
- America/Denver
- America/Edmonton
- America/Fort_Nelson
- America/Hermosillo
- America/Inuvik
- America/Mazatlan
- America/Phoenix
- America/Shiprock
- America/Whitehorse
- America/Yellowknife
- Canada/Mountain
- Canada/Yukon
- MST
- MST7MDT
- Mexico/BajaSur
- Navajo
- US/Arizona
- US/Mountain
- MST - Mountain Standard Time
- PDT - Pacific Daylight Time
- YST - Yukon Standard Time
- T - Tango Time Zone
Pacific Daylight Time
Offset: PDT is 7 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Mexico, United States
Principal Cities: The largest city in the PDT time zone is Los Angeles in the United States, with about 3.821 million people. Other major cities in this time zone include Tijuana, San Diego, Mexicali, San Jose.
French: HAP - Heure Avancée du Pacifique
Spanish: PT - Zona Noroeste
Today all shaded areas are on PDT.
Daylight Saving: Pacific Daylight Time (PDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Pacific Standard Time (PST).
Start: Pacific Daylight Time (PDT) 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: Pacific Daylight Time (PDT) 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 USA daylight saving time and upcoming clock changes worldwide.
PDT representations, usage and related time zones
- -07 - basic short
- -0700 - basic
- -07:00 - extended
- -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.
- Tango - Military abbreviation for PDT
- T - short form of 'Tango'
- America/Ensenada
- America/Los_Angeles
- America/Santa_Isabel
- America/Tijuana
- America/Vancouver
- Canada/Pacific
- Mexico/BajaNorte
- PST8PDT
- US/Pacific
- MST - Mountain Standard Time
- PDT - Pacific Daylight Time
- YST - Yukon Standard Time
- T - Tango Time Zone
Central Standard Time
Offset: CST is 6 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Belize, Canada, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, United States
Principal Cities: The largest city in the CST time zone is Mexico City in Mexico, with about 12.294 million people. Other major cities in this time zone include Chicago, Houston, Puebla, Santiago de Querétaro.
French: HNC - Heure Normale du Centre
Spanish: CT - Tiempo Central Estándar, CT - Zona Centro
Today the lighter areas are on UTC−5 (Central Daylight Time).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Central Daylight Time (CDT).
End: Central Standard Time (CST) 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: Central Standard Time (CST) 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 USA daylight saving time and upcoming clock changes worldwide.
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 an offset of six hours 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/Chihuahua
- 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/Ojinaga
- 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
- Central Standard Time - UTC -6
- China Standard Time - UTC +8
- Cuba Standard Time - UTC -5
- CST - Central Standard Time
- CT - Central Time
- MDT - Mountain Daylight Time
- EAST - Easter Island Standard Time
- GALT - Galapagos Time
- S - Sierra Time Zone
Eastern Standard Time
Offset: EST is 5 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Bahamas, Canada, Cayman Islands, Haiti, Jamaica, Mexico, Panama, Turks and Caicos Islands, United States
Principal Cities: The largest city in the EST time zone is New York City in the United States, with about 8.804 million people. Other major cities in this time zone include Toronto, Montréal, Philadelphia, Port-au-Prince.
French: HNE - Heure Normale de l'Est
Spanish: ET - Tiempo del Este, ET - Zona Sureste
Today the lighter areas are on UTC−4 (EDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Eastern Daylight Time (EDT).
End: Eastern Standard Time (EST) 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: Eastern Standard Time (EST) 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 USA daylight saving time and upcoming clock changes worldwide.
EST representations, usage and related time zones
- -05 - basic short
- -0500 - basic
- -05:00 - extended
- -0500 - sign character (-) followed by a four digit time providing hours (05) and minutes (00) of the offset. Indicates an offset of five hours to the west of the zero meridian.
- Romeo - Military abbreviation for EST
- R - short form of 'Romeo'
- America/Atikokan
- America/Cancun
- America/Cayman
- America/Coral_Harbour
- America/Detroit
- America/Fort_Wayne
- America/Grand_Turk
- America/Indiana/Indianapolis
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Indianapolis
- America/Iqaluit
- America/Jamaica
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Louisville
- America/Montreal
- America/Nassau
- America/New_York
- America/Nipigon
- America/Panama
- America/Pangnirtung
- America/Port-au-Prince
- America/Thunder_Bay
- America/Toronto
- Canada/Eastern
- EST
- EST5EDT
- Jamaica
- US/East-Indiana
- US/Eastern
- US/Michigan
- CDT - Central Daylight Time
- EST - Eastern Standard Time
- ET - Eastern Time
- COT - Colombia Time
- CST - Cuba Standard Time
- EASST - Easter Island Summer Time
- ECT - Ecuador Time
- PET - Peru Time
- R - Romeo Time Zone