IST to ACST
Live, right now. Asia/Kolkata → Australia/Adelaide
12:02 pm in IST is
4:02 pm in ACST.
12:02 → 16:02 on a 24-hour clock ·
IST → ACST
IST now
12:02pm
IST · UTC+5:30
Asia/Kolkata
Clocks here do not change: this zone stays on the same offset all year.
ACST now
4:02pm
ACST · UTC+9:30
Australia/Adelaide
Clocks go forward 1 hour on Sunday, 4th October 2026, at 1:59 am local time (3:00 am after the change).
Convert a specific time minutes work, not just whole hours
Hour by hour
| IST | ACST | 24h | Good to call? |
|---|---|---|---|
| 12am | 4am | 00:00 → 04:00 | asleep in ACST |
| 1am | 5am | 01:00 → 05:00 | asleep in ACST |
| 2am | 6am | 02:00 → 06:00 | asleep in ACST |
| 3am | 7am | 03:00 → 07:00 | asleep in IST |
| 4am | 8am | 04:00 → 08:00 | asleep in IST |
| 5am | 9am | 05:00 → 09:00 | asleep in IST |
| 6am | 10am | 06:00 → 10:00 | asleep in IST |
| 7am | 11am | 07:00 → 11:00 | awake, not at work |
| 8am | 12pm | 08:00 → 12:00 | awake, not at work |
| 9am | 1pm | 09:00 → 13:00 | both at work |
| 10am | 2pm | 10:00 → 14:00 | both at work |
| 11am | 3pm | 11:00 → 15:00 | both at work |
| 12pm now | 4pm | 12:00 → 16:00 | both at work |
| 1pm | 5pm | 13:00 → 17:00 | awake, not at work |
| 2pm | 6pm | 14:00 → 18:00 | awake, not at work |
| 3pm | 7pm | 15:00 → 19:00 | awake, not at work |
| 4pm | 8pm | 16:00 → 20:00 | awake, not at work |
| 5pm | 9pm | 17:00 → 21:00 | awake, not at work |
| 6pm | 10pm | 18:00 → 22:00 | asleep in ACST |
| 7pm | 11pm | 19:00 → 23:00 | asleep in ACST |
| 8pm | 12am Tue | 20:00 → 00:00 | asleep in ACST |
| 9pm | 1am Tue | 21:00 → 01:00 | asleep in ACST |
| 10pm | 2am Tue | 22:00 → 02:00 | asleep in ACST |
| 11pm | 3am Tue | 23:00 → 03:00 | asleep in ACST |
Call times
Both places are at work between 9am and 13:00 in Kolkata, 1pm to 4pm at the other end.
12am
4am
4am
1am
5am
5am
2am
6am
6am
3am
7am
7am
4am
8am
8am
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9am
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7am
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11am
8am
12pm
12pm
9am
1pm
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10am
2pm
2pm
11am
3pm
3pm
12pm
4pm
4pm
1pm
5pm
5pm
2pm
6pm
6pm
3pm
7pm
7pm
4pm
8pm
8pm
5pm
9pm
9pm
6pm
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10pm
7pm
11pm
11pm
8pm
12am
12am
9pm
1am
1am
10pm
2am
2am
11pm
3am
3am
both at work
work hours here
awake
asleep
Questions people ask
What time is it in ACST when it is 12:02 pm in IST?
4:02 pm in ACST the same day.
How many hours ahead is ACST of IST?
ACST is 4 hours ahead of 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 ACST?
Both places are at work between 9am and 13:00 in Kolkata, 1pm to 4pm at the other end.