AST to IST Converter
Atlantic Time is on daylight saving time: ADT (UTC−3) until Sun, Nov 1.
Quick answers
Selected conversion
9:00 am09:00 ADT (UTC-3), Oct 4, 2026 = 5:30 pm17:30 IST (UTC+5:30), Oct 4, 2026
ADT is 8 hours and 30 minutes behind IST.
AST and IST examples
These examples always use AST (UTC-4) and IST (UTC+5:30). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
AST is 9 hours and 30 minutes behind IST.
How the time difference changes
For most of the year, ADT is 8 hours and 30 minutes behind IST. At other times of the year, AST is 9 hours and 30 minutes behind IST.
For most of the year, working hours of 9:00 am to 5:00 pm in ADT correspond to 5:30 pm to 1:30 am (next day) in IST. At other times of the year, working hours of 9:00 am to 5:00 pm in AST correspond to 6:30 pm to 2:30 am (next day) in IST.For most of the year, working hours of 09:00 to 17:00 in ADT correspond to 17:30 to 01:30 (next day) in IST. At other times of the year, working hours of 09:00 to 17:00 in AST correspond to 18:30 to 02:30 (next day) in IST.
Compare AST time with IST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Atlantic Daylight Time is 8 hours and 30 minutes behind India Standard Time.
9:00 am09:00 in ADT is 5:30 pm17:30 in IST
ADT to IST call time
Best time for a conference call or a meeting is between 8:30am-9:30am08:30-09:30 in ADT which corresponds to 5pm-6pm17:00-18:00 in IST
9:00 am09:00 Atlantic Daylight Time (ADT). Offset UTC -3:00 hours
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
9:00 am09:00 ADT / 5:30 pm17:30 IST
| ADT | IST |
|---|---|
| 12:00am | 8:30am |
| 1:00am | 9:30am |
| 2:00am | 10:30am |
| 3:00am | 11:30am |
| 4:00am | 12:30pm |
| 5:00am | 1:30pm |
| 6:00am | 2:30pm |
| 7:00am | 3:30pm |
| 8:00am | 4:30pm |
| 9:00am | 5:30pm |
| 10:00am | 6:30pm |
| 11:00am | 7:30pm |
| 12:00pm | 8:30pm |
| 1:00pm | 9:30pm |
| 2:00pm | 10:30pm |
| 3:00pm | 11:30pm |
| 4:00pm | 12:30am |
| 5:00pm | 1:30am |
| 6:00pm | 2:30am |
| 7:00pm | 3:30am |
| 8:00pm | 4:30am |
| 9:00pm | 5:30am |
| 10:00pm | 6:30am |
| 11:00pm | 7:30am |
| 00:00 | 08:30 |
| 01:00 | 09:30 |
| 02:00 | 10:30 |
| 03:00 | 11:30 |
| 04:00 | 12:30 |
| 05:00 | 13:30 |
| 06:00 | 14:30 |
| 07:00 | 15:30 |
| 08:00 | 16:30 |
| 09:00 | 17:30 |
| 10:00 | 18:30 |
| 11:00 | 19:30 |
| 12:00 | 20:30 |
| 13:00 | 21:30 |
| 14:00 | 22:30 |
| 15:00 | 23:30 |
| 16:00 | 00:30 |
| 17:00 | 01:30 |
| 18:00 | 02:30 |
| 19:00 | 03:30 |
| 20:00 | 04:30 |
| 21:00 | 05:30 |
| 22:00 | 06:30 |
| 23:00 | 07:30 |
Atlantic Standard Time
Offset: AST is 4 hours behind Greenwich Mean Time (GMT) and is used in North America
Countries using this time zone: 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 time zone is Santo Domingo in Dominican Republic, with about 2.202 million people. Other major cities in this time zone include Santiago de los Caballeros, Santo Domingo Oeste, Halifax, San Juan.
French: HNA - Heure Normale de l'Atlantique
Spanish: AST - Tiempo Estándar del Atlántico
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.
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
- FKT - Falkland Island Time
- GYT - Guyana Time
- HLV - Hora Legal de Venezuela
- PYT - Paraguay Time
- Q - Quebec Time Zone
- VET - Venezuelan Standard Time
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
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, Bangalore, Chennai, Kolkata.
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.
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