IST to AEST: IST is 4 hours 30 minutes behind AEST
India Standard Time is 4 hours 30 minutes behind Australian Eastern Time right now. It is 11:48 am IST in India and 4:18 pm AEST in Australian Eastern.
Convert a specific time from IST to AEST
Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.
What is the time difference between IST and AEST?
Australian Eastern Time is 4 hours 30 minutes ahead of India Standard Time. To go from IST to AEST you add 4 hours 30 minutes. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from 4 hours 30 minutes to 5 hours 30 minutes, because Australian Eastern moves its clocks and India does not. This page recomputes it rather than assuming.
IST to AEST conversion table
Every hour of Friday, September 25, 2026 in India, with the matching reading in Australian Eastern. 4 of the 24 hours land on a different calendar date in Australian Eastern, which is the part people get wrong when they schedule across this pair.
| IST | IST 24h | AEST | AEST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 4:30 am | 04:30 | same day |
| 1:00 am | 01:00 | 5:30 am | 05:30 | same day |
| 2:00 am | 02:00 | 6:30 am | 06:30 | same day |
| 3:00 am | 03:00 | 7:30 am | 07:30 | same day |
| 4:00 am | 04:00 | 8:30 am | 08:30 | same day |
| 5:00 am | 05:00 | 9:30 am | 09:30 | same day |
| 6:00 am | 06:00 | 10:30 am | 10:30 | same day |
| 7:00 am | 07:00 | 11:30 am | 11:30 | same day |
| 8:00 am | 08:00 | 12:30 pm | 12:30 | same day |
| 9:00 am | 09:00 | 1:30 pm | 13:30 | same day |
| 10:00 am | 10:00 | 2:30 pm | 14:30 | same day |
| 11:00 am | 11:00 | 3:30 pm | 15:30 | same day |
| 12:00 pm | 12:00 | 4:30 pm | 16:30 | same day |
| 1:00 pm | 13:00 | 5:30 pm | 17:30 | same day |
| 2:00 pm | 14:00 | 6:30 pm | 18:30 | same day |
| 3:00 pm | 15:00 | 7:30 pm | 19:30 | same day |
| 4:00 pm | 16:00 | 8:30 pm | 20:30 | same day |
| 5:00 pm | 17:00 | 9:30 pm | 21:30 | same day |
| 6:00 pm | 18:00 | 10:30 pm | 22:30 | same day |
| 7:00 pm | 19:00 | 11:30 pm | 23:30 | same day |
| 8:00 pm | 20:00 | 12:30 am | 00:30 | the next day |
| 9:00 pm | 21:00 | 1:30 am | 01:30 | the next day |
| 10:00 pm | 22:00 | 2:30 am | 02:30 | the next day |
| 11:00 pm | 23:00 | 3:30 am | 03:30 | the next day |
What are the best hours to schedule a call between IST and AEST?
4 hours of the standard 9:00 am to 5:00 pm working day line up in both zones, from 9:00 am IST to 1:00 pm IST. In Australian Eastern that window reads 1:30 pm to 5:30 pm. Outside it, one side is either not yet at their desk or already gone.
| IST | AEST | Working hours | Note |
|---|---|---|---|
| 9:00 am | 1:30 pm | both sides | mid morning in India, afternoon in Australian Eastern |
| 10:00 am | 2:30 pm | both sides | mid morning in India, afternoon in Australian Eastern |
| 11:00 am | 3:30 pm | both sides | mid morning in India, afternoon in Australian Eastern |
| 12:00 pm | 4:30 pm | both sides | noon in India, afternoon in Australian Eastern |
Does daylight saving change IST to AEST?
India Standard Time does not move its clocks at all, so its UTC+5:30 offset holds every day of the year.
Australian Eastern Time is currently on AEST and changes next on Sunday, October 4, 2026, when the clock jumps forward from 1:59 am to 3:00 am and the offset moves from UTC+10 to UTC+11.
Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is 4 hours 30 minutes and for the rest it is 5 hours 30 minutes. The table above is built for today, not for an average day.
Is IST ahead of or behind AEST?
IST is behind AEST by 4 hours 30 minutes: when it is 12:00 pm in India, it is 4:30 pm in Australian Eastern. One wrinkle worth knowing: AEST and AEDT are two names for the same zone, not two zones. Australian Eastern Time reads AEST in winter and AEDT in summer. When somebody types "ist to aest" they nearly always mean the zone rather than the literal winter offset, so this page resolves IST to Asia/Kolkata and AEST to Australia/Sydney and applies whichever offset is genuinely in force on the day.
India Standard Time covers the whole of India on a single half hour offset. Australian Eastern Time covers Sydney, Melbourne and Canberra, where summer falls in December. The identifiers behind them are Asia/Kolkata and Australia/Sydney, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is IST in AEST?
- IST is 4 hours 30 minutes behind AEST. 9:00 am IST is 1:30 pm AEST.
- How many hours ahead is AEST of IST?
- AEST is 4 hours 30 minutes ahead of IST. That varies across the year, between 4 hours 30 minutes and 5 hours 30 minutes.
- What time is it in Australian Eastern right now?
- 4:18 pm AEST on Friday, September 25, 2026.
- When can India and Australian Eastern meet during working hours?
- Between 9:00 am and 1:00 pm IST, which is 1:30 pm to 5:30 pm AEST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so IST and AEST are the abbreviations genuinely in force today rather than a fixed assumption.
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