Offset
The time difference between Atlantic Time and India Standard Time is 8.5 hours.
Atlantic Time (ADT) is behind India Standard Time (IST).
ADT: UTC-3
IST: UTC+5:30
Atlantic Time is currently observing daylight saving time; India Standard Time is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Atlantic Time and India Standard Time don't overlap on the same weekday. India Standard Time is 9 hours ahead of Atlantic Time.
With some flexibility, there’s a workable window outside standard hours:
- 7 AM–12 PM in Atlantic Time (3 PM–8 PM in India Standard Time) — suggest 9:00 AM Atlantic Time (5:30 PM India Standard Time).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Canada
- New Year's DayThu, Jan 1
- Good FridayFri, Apr 3
- Victoria DayMon, May 18
- Canada DayWed, Jul 1
- Labour DayMon, Sep 7
- National Day for Truth and ReconciliationWed, Sep 30
- ThanksgivingMon, Oct 12
- Christmas DayFri, Dec 25
About these zones
Atlantic Time is also known as AST, or ADT. To call Canada, dial +1.
India Standard Time is also known as IST. To call India, dial +91.
India Standard Time is approximately 7,250 miles northeast of Atlantic Time.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| AST-ATLANTIC | IST | Day |
|---|---|---|
| 12:00 am | 8:30 am | Same day |
| 1:00 am | 9:30 am | Same day |
| 2:00 am | 10:30 am | Same day |
| 3:00 am | 11:30 am | Same day |
| 4:00 am | 12:30 pm | Same day |
| 5:00 am | 1:30 pm | Same day |
| 6:00 am | 2:30 pm | Same day |
| 7:00 am | 3:30 pm | Same day |
| 8:00 am | 4:30 pm | Same day |
| 9:00 am | 5:30 pm | Same day |
| 10:00 am | 6:30 pm | Same day |
| 11:00 am | 7:30 pm | Same day |
| 12:00 pm | 8:30 pm | Same day |
| 1:00 pm | 9:30 pm | Same day |
| 2:00 pm | 10:30 pm | Same day |
| 3:00 pm | 11:30 pm | Same day |
| 4:00 pm | 12:30 am | +1 day |
| 5:00 pm | 1:30 am | +1 day |
| 6:00 pm | 2:30 am | +1 day |
| 7:00 pm | 3:30 am | +1 day |
| 8:00 pm | 4:30 am | +1 day |
| 9:00 pm | 5:30 am | +1 day |
| 10:00 pm | 6:30 am | +1 day |
| 11:00 pm | 7:30 am | +1 day |
Daylight saving time
Atlantic Time observes daylight saving time; India Standard Time does not. The offset between the two zones changes when Atlantic Time transitions: on Sunday, November 1, 2026, clocks fall back from ADT to AST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:31 AM
- Sunset
- 8:56 PM
- Day length
- 15h 25m
- Sunrise
- 6:01 AM
- Sunset
- 7:15 PM
- Day length
- 13h 14m
Daylight overlap: 5h 13m — 5:31 AM–10:45 AM in Atlantic Time (2:01 PM–7:15 PM in India Standard Time). Both locations are in daylight during this window.
Cities in these zones
Cities in Atlantic Time
Cities in India Standard Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Atlantic Time
- YHZ
Airports in India Standard Time
- BOM
- NMI
- DEL
- BLR
- HYD
- AMD
- MAA
- CCU
- STV
- PNQ
Related conversions
Common conversions
- What is 9:00 am AST-ATLANTIC in IST?
- 9:00 am AST-ATLANTIC is 5:30 pm IST.
- What is 12:00 pm AST-ATLANTIC in IST?
- 12:00 pm AST-ATLANTIC is 8:30 pm IST.
- What is 12:30 pm AST-ATLANTIC in IST?
- 12:30 pm AST-ATLANTIC is 9:00 pm IST.
- What is 2:00 pm AST-ATLANTIC in IST?
- 2:00 pm AST-ATLANTIC is 10:30 pm IST.
- What is 5:00 pm AST-ATLANTIC in IST?
- 5:00 pm AST-ATLANTIC is 1:30 am IST, the next day.
- What is 11:30 pm AST-ATLANTIC in IST?
- 11:30 pm AST-ATLANTIC is 8:00 am IST, the next day.