AST to IST Converter
IST is 9 hours 30 minutes ahead of AST. 9:00 AM AST = 6:30 PM IST.
IST is 9 hours 30 minutes ahead of AST at the moment. To convert AST to IST, add 9 hours 30 minutes to the AST time: 9:00 AM AST = 6:30 PM IST.
AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year). IST (India Time) is used in India and Sri Lanka (UTC+5:30, no daylight saving time).
AST here is Atlantic Standard Time, not Arabia Standard Time. IST here means India Standard Time, not Irish or Israel Standard Time.
AST to IST time conversion table
AST to IST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| AST | IST | Day |
|---|---|---|
| 12:00 AM AST | 9:30 AM IST | — |
| 1:00 AM AST | 10:30 AM IST | — |
| 2:00 AM AST | 11:30 AM IST | — |
| 3:00 AM AST | 12:30 PM IST | — |
| 4:00 AM AST | 1:30 PM IST | — |
| 5:00 AM AST | 2:30 PM IST | — |
| 6:00 AM AST | 3:30 PM IST | — |
| 7:00 AM AST | 4:30 PM IST | — |
| 8:00 AM AST | 5:30 PM IST | — |
| 9:00 AM AST | 6:30 PM IST | — |
| 10:00 AM AST | 7:30 PM IST | — |
| 11:00 AM AST | 8:30 PM IST | — |
| 12:00 PM AST | 9:30 PM IST | — |
| 1:00 PM AST | 10:30 PM IST | night |
| 2:00 PM AST | 11:30 PM IST | night |
| 3:00 PM AST | 12:30 AM IST | next day |
| 4:00 PM AST | 1:30 AM IST | next day |
| 5:00 PM AST | 2:30 AM IST | next day |
| 6:00 PM AST | 3:30 AM IST | next day |
| 7:00 PM AST | 4:30 AM IST | next day |
| 8:00 PM AST | 5:30 AM IST | next day |
| 9:00 PM AST | 6:30 AM IST | next day |
| 10:00 PM AST | 7:30 AM IST | next day |
| 11:00 PM AST | 8:30 AM IST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert AST to IST
Add 9 hours 30 minutes to the AST time to get IST.
Example: 9:00 AM AST = 6:30 PM IST.
Across midnight: 10:00 PM AST = 7:30 AM IST (next day). The date changes, so always check the day as well as the hour.
Time difference between AST and IST
The time difference between AST and IST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 31 Dec 2025 – 7 Mar 2026: IST is 9 hours 30 minutes ahead of AST.
- 8 Mar 2026 – 31 Oct 2026: IST is 8 hours 30 minutes ahead of AST.
- 1 Nov 2026 – 30 Dec 2026: IST is 9 hours 30 minutes ahead of AST.
AST and IST during daylight saving time
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
- IST does not observe daylight saving time; it stays on UTC+5:30 all year.
Best time for a meeting between AST and IST
AST and IST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AST, which is 4:30 PM IST.
AST to IST FAQ
What is the time difference between AST and IST?
Right now IST is 9 hours 30 minutes ahead of AST. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM AST in IST?
9:00 AM AST is 6:30 PM IST.
What is 12 PM (noon) AST in IST?
12:00 PM AST is 9:30 PM IST.
Is IST ahead of or behind AST?
IST is 9 hours 30 minutes ahead of AST, so it is later in IST than in AST.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
Does IST change for daylight saving time?
No. IST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between AST and IST?
AST and IST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM AST, which is 4:30 PM IST.
Related conversions
Convert IST to AST
Convert AST to other time zones
Convert other time zones to IST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.