What is AST in IST?
India Standard Time is 8 hours 30 minutes ahead
Atlantic Time is on UTC−3:00 and India Standard Time is on UTC+5:30 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.
- Time in Halifax
- 9:03:43 AM
- Time in New Delhi
- 5:33:43 PM
- Difference
- +8:30 h
- Next clock change
- November 1, 2026
Convert a time
IST — India Standard Time
5:30 pm
IST, Fri
When the difference changes
Atlantic Time and India Standard Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – November 1, 2026India Standard Time is 8 hours 30 minutes ahead
- November 1, 2026 – March 14, 2027India Standard Time is 9 hours 30 minutes ahead
- March 14, 2027 – onwardsIndia Standard Time is 8 hours 30 minutes ahead
Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.
Daylight saving
Atlantic Time
Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.
India Standard Time
India Standard Time stays on IST all year, so its offset from UTC never moves.
AST to IST conversion table
Every hour of Friday, September 25, 2026, converted from Atlantic Time to India Standard Time. 8 of the 24 hours fall on a different calendar day in New Delhi, which is marked.
- 12:00 am ADT
- 8:30 am IST
- 1:00 am ADT
- 9:30 am IST
- 2:00 am ADT
- 10:30 am IST
- 3:00 am ADT
- 11:30 am IST
- 4:00 am ADT
- 12:30 pm IST
- 5:00 am ADT
- 1:30 pm IST
- 6:00 am ADT
- 2:30 pm IST
- 7:00 am ADT
- 3:30 pm IST
- 8:00 am ADT
- 4:30 pm IST
- 9:00 am ADT
- 5:30 pm IST
- 10:00 am ADT
- 6:30 pm IST
- 11:00 am ADT
- 7:30 pm IST
- 12:00 pm ADT
- 8:30 pm IST
- 1:00 pm ADT
- 9:30 pm IST
- 2:00 pm ADT
- 10:30 pm IST
- 3:00 pm ADT
- 11:30 pm IST
- 4:00 pm ADT
- 12:30 am IST+1 day
- 5:00 pm ADT
- 1:30 am IST+1 day
- 6:00 pm ADT
- 2:30 am IST+1 day
- 7:00 pm ADT
- 3:30 am IST+1 day
- 8:00 pm ADT
- 4:30 am IST+1 day
- 9:00 pm ADT
- 5:30 am IST+1 day
- 10:00 pm ADT
- 6:30 am IST+1 day
- 11:00 pm ADT
- 7:30 am IST+1 day
Scheduling between the two
Working hours overlap from 9:00 am to 10:00 am ADT, which is 5:30 pm to 6:30 pm IST. Anything inside that window falls in the normal working day at both ends.
A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.
A note on IST: it can also mean Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1). This page means India Standard Time, which is what almost all searches for IST want.
Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico
India Standard Time (IST) is used in all of India and Sri Lanka, on a single UTC+5:30 offset with no daylight saving
Other conversions
- IST to AST
- AST to UTC
- AST to GMT
- AST to EST
- AST to CST
- AST to MST
- AST to PST
- AST to AKST
- AST to HST
- AST to BST
- AST to CET
- AST to CST (China)
- AST to JST
- AST to AEST
- AST to Mexico City
- AST to BRT
- AST to ART
- AST to EET
- AST to WET
- AST to MSK
- AST to TRT
- AST to SAST
- AST to WAT
- AST to EAT
- AST to GST
- AST to PKT
- AST to ICT
- AST to WIB
- AST to SGT
- AST to HKT
- AST to KST
- AST to PHT
- AST to AWST
- AST to ACST
- AST to NZST
- All zones