IST to AST
Converting a fixed time. Asia/Kolkata → America/Halifax
Clocks here do not change — this zone stays on the same offset all year.
Clocks go back 1 hour on Sunday, 1st November 2026, at 1:59 am local time (1:00 am after the change).
Convert a specific time minutes work, not just whole hours
Hour by hour
| IST | AST | 24h | Good to call? |
|---|---|---|---|
| 12am | 3pm Wed | 00:00 → 15:30 | asleep in IST |
| 1am | 4pm Wed | 01:00 → 16:30 | asleep in IST |
| 2am | 5pm Wed | 02:00 → 17:30 | asleep in IST |
| 3am | 6pm Wed | 03:00 → 18:30 | asleep in IST |
| 4am | 7pm Wed | 04:00 → 19:30 | asleep in IST |
| 5am | 8pm Wed | 05:00 → 20:30 | asleep in IST |
| 6am | 9pm Wed | 06:00 → 21:30 | asleep in IST |
| 7am | 10pm Wed | 07:00 → 22:30 | asleep in AST |
| 8am | 11pm Wed | 08:00 → 23:30 | asleep in AST |
| 9am now | 12am | 09:00 → 00:30 | asleep in AST |
| 10am | 1am | 10:00 → 01:30 | asleep in AST |
| 11am | 2am | 11:00 → 02:30 | asleep in AST |
| 12pm | 3am | 12:00 → 03:30 | asleep in AST |
| 1pm | 4am | 13:00 → 04:30 | asleep in AST |
| 2pm | 5am | 14:00 → 05:30 | asleep in AST |
| 3pm | 6am | 15:00 → 06:30 | asleep in AST |
| 4pm | 7am | 16:00 → 07:30 | awake, not at work |
| 5pm | 8am | 17:00 → 08:30 | awake, not at work |
| 6pm | 9am | 18:00 → 09:30 | awake, not at work |
| 7pm | 10am | 19:00 → 10:30 | awake, not at work |
| 8pm | 11am | 20:00 → 11:30 | awake, not at work |
| 9pm | 12pm | 21:00 → 12:30 | awake, not at work |
| 10pm | 1pm | 22:00 → 13:30 | asleep in IST |
| 11pm | 2pm | 23:00 → 14:30 | asleep in IST |
Call times
There is no hour when both places are inside normal working hours. The least bad slot is usually early morning at the western end.
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm
11pm
12am
1am
2am
3am
4am
5am
6am
7am
8am
9am
10am
11am
12pm
1pm
2pm
Questions people ask
What time is it in AST when it is 7:45 pm in IST?
11:15 am in AST the same day.
How many hours ahead is AST of IST?
AST is 8 hours 30 minutes behind IST. That gap is not fixed: it changes when either place starts or ends daylight saving. The table on this page is recalculated for today, so it is already correct for the current season.
What is the best time to call between IST and AST?
There is no hour when both places are inside normal working hours. The least bad slot is usually early morning at the western end.