AST to PST to CST to EST to IST Time Converter
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
8:00 am08:00 AST (UTC-4), Nov 10, 2026 = 4:00 am04:00 PST (UTC-8), Nov 10, 2026 = 6:00 am06:00 CST (UTC-6), Nov 10, 2026 = 7:00 am07:00 EST (UTC-5), Nov 10, 2026 = 5:30 pm17:30 IST (UTC+5:30), Nov 10, 2026
AST is 4 hours ahead of PST. AST is 2 hours ahead of CST. AST is 1 hour ahead of EST. AST is 9 hours and 30 minutes behind IST.
How the time difference changes
AST to PST
For most of the year, ADT is 4 hours ahead of PDT. From Nov 1, 2026 to Mar 14, 2027, and from Nov 7, 2027 to Mar 12, 2028, 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, and from Nov 7, 2027 to Mar 12, 2028, 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, and from Nov 7, 2027 to Mar 12, 2028, 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.
AST to IST
For most of the year, ADT is 8 hours and 30 minutes behind IST. From Nov 1, 2026 to Mar 14, 2027, and from Nov 7, 2027 to Mar 12, 2028, AST is 9 hours and 30 minutes behind IST.
For most of the year, working hours of 9:00 am to 6:00 pm in ADT correspond to 5:30 pm to 2:30 am (next day) in IST. At other times of the year, working hours of 9:00 am to 6:00 pm in AST correspond to 6:30 pm to 3:30 am (next day) in IST.For most of the year, working hours of 09:00 to 18:00 in ADT correspond to 17:30 to 02:30 (next day) in IST. At other times of the year, working hours of 09:00 to 18:00 in AST correspond to 18:30 to 03:30 (next day) in IST.
Compare AST time with PST, CST, EST, and IST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Atlantic Standard Time is 4 hours ahead of Pacific Standard Time. Atlantic Standard Time is 2 hours ahead of Central Standard Time. Atlantic Standard Time is 1 hour ahead of Eastern Standard Time. Atlantic Standard Time is 9 hours and 30 minutes behind India Standard Time.
8:00 am08:00 in AST is 4:00 am04:00 in PST and is 6:00 am06:00 in CST and is 7:00 am07:00 in EST and is 5:30 pm17:30 in IST
AST to PST call time
Best time for a conference call or a meeting is between 1pm-6pm13:00-18:00 in AST which corresponds to 9am-2pm09:00-14:00 in PST.
AST to CST call time
Best time for a conference call or a meeting is between 11am-6pm11:00-18:00 in AST which corresponds to 9am-4pm09:00-16:00 in CST.
AST to EST call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in AST which corresponds to 9am-5pm09:00-17:00 in EST.
AST to IST call time
Best time for a conference call or a meeting is between 8:30am-9:30am08:30-09:30 in AST which corresponds to 6pm-7pm18:00-19:00 in IST. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
8:00 am08:00 Atlantic Standard Time (AST). Offset UTC -4:00 hours
4:00 am04:00 Pacific Standard Time (PST). Offset UTC -8:00 hours
6:00 am06:00 Central Standard Time (CST). Offset UTC -6:00 hours
7:00 am07:00 Eastern Standard Time (EST). Offset UTC -5:00 hours
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
8:00 am08:00 AST / 4:00 am04:00 PST / 6:00 am06:00 CST / 7:00 am07:00 EST / 5:30 pm17:30 IST
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.
| AST | PST | CST | EST | IST |
|---|---|---|---|---|
| 8:00pm previous day | 10:00pm previous day | 11:00pm previous day | 9:30am | |
| 9:00pm previous day | 11:00pm previous day | 12:00am | 10:30am | |
| 10:00pm previous day | 12:00am | 1:00am | 11:30am | |
| 11:00pm previous day | 1:00am | 2:00am | 12:30pm | |
| 12:00am | 2:00am | 3:00am | 1:30pm | |
| 1:00am | 3:00am | 4:00am | 2:30pm | |
| 2:00am | 4:00am | 5:00am | 3:30pm | |
| 3:00am | 5:00am | 6:00am | 4:30pm | |
| 4:00am | 6:00am | 7:00am | 5:30pm | |
| 5:00am | 7:00am | 8:00am | 6:30pm | |
| 6:00am | 8:00am | 9:00am | 7:30pm | |
| 7:00am | 9:00am | 10:00am | 8:30pm | |
| 8:00am | 10:00am | 11:00am | 9:30pm | |
| 9:00am | 11:00am | 12:00pm | 10:30pm | |
| 10:00am | 12:00pm | 1:00pm | 11:30pm | |
| 11:00am | 1:00pm | 2:00pm | 12:30am next day | |
| 12:00pm | 2:00pm | 3:00pm | 1:30am next day | |
| 1:00pm | 3:00pm | 4:00pm | 2:30am next day | |
| 2:00pm | 4:00pm | 5:00pm | 3:30am next day | |
| 3:00pm | 5:00pm | 6:00pm | 4:30am next day | |
| 4:00pm | 6:00pm | 7:00pm | 5:30am next day | |
| 5:00pm | 7:00pm | 8:00pm | 6:30am next day | |
| 6:00pm | 8:00pm | 9:00pm | 7:30am next day | |
| 7:00pm | 9:00pm | 10:00pm | 8:30am next day | |
| 20:00 previous day | 22:00 previous day | 23:00 previous day | 09:30 | |
| 21:00 previous day | 23:00 previous day | 00:00 | 10:30 | |
| 22:00 previous day | 00:00 | 01:00 | 11:30 | |
| 23:00 previous day | 01:00 | 02:00 | 12:30 | |
| 00:00 | 02:00 | 03:00 | 13:30 | |
| 01:00 | 03:00 | 04:00 | 14:30 | |
| 02:00 | 04:00 | 05:00 | 15:30 | |
| 03:00 | 05:00 | 06:00 | 16:30 | |
| 04:00 | 06:00 | 07:00 | 17:30 | |
| 05:00 | 07:00 | 08:00 | 18:30 | |
| 06:00 | 08:00 | 09:00 | 19:30 | |
| 07:00 | 09:00 | 10:00 | 20:30 | |
| 08:00 | 10:00 | 11:00 | 21:30 | |
| 09:00 | 11:00 | 12:00 | 22:30 | |
| 10:00 | 12:00 | 13:00 | 23:30 | |
| 11:00 | 13:00 | 14:00 | 00:30 next day | |
| 12:00 | 14:00 | 15:00 | 01:30 next day | |
| 13:00 | 15:00 | 16:00 | 02:30 next day | |
| 14:00 | 16:00 | 17:00 | 03:30 next day | |
| 15:00 | 17:00 | 18:00 | 04:30 next day | |
| 16:00 | 18:00 | 19:00 | 05:30 next day | |
| 17:00 | 19:00 | 20:00 | 06:30 next day | |
| 18:00 | 20:00 | 21:00 | 07:30 next day | |
| 19:00 | 21:00 | 22:00 | 08:30 next day |
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 all shaded areas are on AST.
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).
Start: Atlantic Standard Time (AST) started on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
End: Atlantic Standard Time (AST) ends on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
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
Pacific Standard Time
Offset: PST is 8 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Mexico, United States
Principal Cities: The largest city in the PST 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: HNP - Heure Normale du Pacifique
Spanish: PT - Tiempo del Pacífico, PT - Zona Noroeste
Today all shaded areas are on PST.
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Pacific Daylight Time (PDT).
Start: Pacific Standard Time (PST) started on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
End: Pacific Standard Time (PST) ends on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
See USA daylight saving time and upcoming clock changes worldwide.
PST representations, usage and related time zones
- -08 - basic short
- -0800 - basic
- -08:00 - extended
- -0800 - sign character (-) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the west of the zero meridian.
- Uniform - Military abbreviation for PST
- U - short form of 'Uniform'
- America/Ensenada
- America/Los_Angeles
- America/Santa_Isabel
- America/Tijuana
- America/Vancouver
- Canada/Pacific
- Mexico/BajaNorte
- PST8PDT
- US/Pacific
- Pacific Standard Time - UTC -8
- Pitcairn Standard Time - UTC -8
- AKDT - Alaska Daylight Time
- PST - Pacific Standard Time
- PT - Pacific Time
- PST - Pitcairn Standard Time
- U - Uniform 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 all shaded areas are on CST.
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).
Start: Central Standard Time (CST) started on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
End: Central Standard Time (CST) ends on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
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 all shaded areas are on EST.
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).
Start: Eastern Standard Time (EST) started on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
End: Eastern Standard Time (EST) ends on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
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
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: India
Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bengaluru, Hyderabad, Ahmedabad.
Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
Current time in India: India time now
IST representations, usage and related time zones
- +0530 - basic
- +05:30 - extended
- +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2