AEST to IST
Australian Eastern Time is 4 hours and 30 minutes ahead of India Standard Time.
Times may vary due to daylight saving time.Quick answer. IST is 5 hours and 30 minutes behind AEST for part of the year and 4 hours and 30 minutes behind for the rest, because AEST observes daylight saving time and the other side does not. The gap is 5 hours and 30 minutes during AEST's standard-time months and 4 hours and 30 minutes during daylight time, so always convert against a specific date.
Time difference
Australian Eastern Time (AEST/AEDT)
AEST UTC+10:00 AEDT UTC+11:00 Observes DST
Sydney, Melbourne, Canberra, Brisbane (AEST year-round), Hobart.
- ↓ April 5, 2026 clocks back at 2:00 AM · UTC+11:00 → UTC+10:00
- ↑ October 4, 2026 clocks forward at 3:00 AM · UTC+10:00 → UTC+11:00
Australian daylight saving runs opposite to the northern hemisphere: clocks go forward in October and back in April, so the India–Sydney gap is widest during the Indian winter. Queensland, including Brisbane, stays on AEST all year.
India Standard Time (IST)
IST UTC+5:30 No DST
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad.
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
AEST to IST conversion table
Every hour of the day for 2026. Because AEST changes clocks twice a year, these values shift by an hour across the daylight saving boundary — use the date picker above for a specific day.
| AEST | IST | 24-hour |
|---|---|---|
| 12 AM | 7:30 PM −1 day | 19:30 |
| 1 AM | 8:30 PM −1 day | 20:30 |
| 2 AM | 9:30 PM −1 day | 21:30 |
| 3 AM | 10:30 PM −1 day | 22:30 |
| 4 AM | 11:30 PM −1 day | 23:30 |
| 5 AM | 12:30 AM | 00:30 |
| 6 AM | 1:30 AM | 01:30 |
| 7 AM | 2:30 AM | 02:30 |
| 8 AM | 3:30 AM | 03:30 |
| 9 AM | 4:30 AM | 04:30 |
| 10 AM | 5:30 AM | 05:30 |
| 11 AM | 6:30 AM | 06:30 |
| 12 PM | 7:30 AM | 07:30 |
| 1 PM | 8:30 AM | 08:30 |
| 2 PM | 9:30 AM | 09:30 |
| 3 PM | 10:30 AM | 10:30 |
| 4 PM | 11:30 AM | 11:30 |
| 5 PM | 12:30 PM | 12:30 |
| 6 PM | 1:30 PM | 13:30 |
| 7 PM | 2:30 PM | 14:30 |
| 8 PM | 3:30 PM | 15:30 |
| 9 PM | 4:30 PM | 16:30 |
| 10 PM | 5:30 PM | 17:30 |
| 11 PM | 6:30 PM | 18:30 |
Highlighted rows are the 4 hours where a 9–6 working day in AEST overlaps a 9–5 working day in IST.
Popular conversion times
| AEST | IST |
|---|---|
| 9 AM AEST | 4:30 AM |
| 10 AM AEST | 5:30 AM |
| 11 AM AEST | 6:30 AM |
| 12 PM AEST | 7:30 AM |
| 3 PM AEST | 10:30 AM |
| 5 PM AEST | 12:30 PM |
| 6 PM AEST | 1:30 PM |
| 8 PM AEST | 3:30 PM |
Business hours and meeting times
Comparing a 9:00–18:00 working day in AEST against 9:00–17:00 in IST, across the whole week — a slot only counts if it lands on a working day at both ends.
Both sides work Monday to Friday, so the working weeks line up and you share 5 days.
Rows are days in AEST. Columns are hours of the AEST day.
Best recurring slot
2 PM AEST = 9:30 AM IST , every shared working day
Across the week that is 20 overlapping working hours . The widest day is Monday, with 4 hours.
| Day | Overlap (AEST) | Local (IST) | Hours |
|---|---|---|---|
| Monday | 2 PM – 6 PM | 9:30 AM – 1:30 PM | 4 |
| Tuesday | 2 PM – 6 PM | 9:30 AM – 1:30 PM | 4 |
| Wednesday | 2 PM – 6 PM | 9:30 AM – 1:30 PM | 4 |
| Thursday | 2 PM – 6 PM | 9:30 AM – 1:30 PM | 4 |
| Friday | 2 PM – 6 PM | 9:30 AM – 1:30 PM | 4 |
| Saturday | AEST weekend | — | — |
| Sunday | AEST weekend | — | — |
Public holidays
A shared working day is only usable if neither side is on holiday — and India and IST build their calendars on different systems, so the days each loses rarely coincide.
Over the next 8 weeks you share 40 working days. 6are lost to a public holiday on one side or the other, leaving 34.
| Date | Who is off | Holiday |
|---|---|---|
| Friday, September 25, 2026 | AEST | Friday before AFL Grand Final |
| Monday, September 28, 2026 | AEST | King's Birthday |
| Friday, October 2, 2026 | India | Gandhi Jayanti |
| Monday, October 5, 2026 | AEST | Labour Day / King's Birthday |
| Tuesday, October 20, 2026 | India | Dussehra (Vijayadashami) |
| Tuesday, November 3, 2026 | AEST | Melbourne Cup |
Next holidays in AEST
- Friday, September 25, 2026Friday before AFL Grand Finalregionalpublished date
- Monday, September 28, 2026King's Birthdayregionalpublished date
- Monday, October 5, 2026Labour Day / King's Birthdayregionalpublished date
- Tuesday, November 3, 2026Melbourne Cupregionalpublished date
- Friday, December 25, 2026Christmas Daypublished date
Public holidays as published by https://date.nager.at, covering 2026–2028. Regional and employer-specific days are not included.
Next holidays in India
- Friday, October 2, 2026Gandhi Jayantisame date every year
- Tuesday, October 20, 2026Dussehra (Vijayadashami)partialpublished date
- Sunday, November 8, 2026Diwalipublished date
- Monday, November 9, 2026Diwalipublished date
- Friday, December 25, 2026Christmas Daypartialsame date every year
India has three national holidays on which the whole country closes. Everything else is either a central-government gazetted holiday that individual employers choose to observe, or a state holiday. Festival dates follow lunisolar calendars and move every year, so they are listed explicitly rather than derived.
Holiday dates for AEST and elsewhere come from a dataset last refreshed on 2026-09-12 (date.nager.at plus curated national calendars). Lunar dates — Eid, Chinese New Year, the Jewish holidays — are predicted and can move by a day once officially announced. Regional, state and employer-specific holidays are not included. Confirm anything you are booking a flight around.
About this conversion
Australian daylight saving runs opposite to the northern hemisphere: clocks go forward in October and back in April, so the India–Sydney gap is widest during the Indian winter. Queensland, including Brisbane, stays on AEST all year.
India runs on a single time zone, UTC+5:30, and has not observed daylight saving time since 1945. The half-hour offset is why IST conversions rarely land on a round hour.
Frequently asked questions
What is the time difference between AEST and IST?
It depends on the date. IST is 5 hours and 30 minutes behind AEST in January and 4 hours and 30 minutes behind in July, because AEST changes clocks for daylight saving time. Use the converter above with the date you actually need.
What time is 9 AM AEST in IST?
9:00 AM AEST is 3:30 AM in IST during IST, and 4:30 AM during daylight time. The table on this page lists all 24 hours for the date you pick.
What is the best time for a meeting between AEST and IST?
Working days overlap for about 4 hours on a typical Monday: 2 PM to 6 PM AEST, which is 9:30 AM to 1:30 PM in IST. For a recurring invite, 2 PM AEST / 9:30 AM IST is the slot that works on the most days.
Does AEST observe daylight saving time?
Yes. AEST alternates between AEST (UTC+10:00) and AEDT (UTC+11:00). In 2026, clocks in AEST go forward on October 4, 2026 and back on April 5, 2026. India does not shift at all, so the gap between the two moves twice a year.
When do the clocks change in AEST?
In 2026, clocks in AEST go forward on October 4, 2026 and back on April 5, 2026. Between those dates the gap from India is 4 hours and 30 minutes; outside them it is 5 hours and 30 minutes.
Why does the AEST–IST difference change during the year?
Because AEST switches between AEST (UTC+10:00) and AEDT (UTC+11:00) for daylight saving, while the other side does not move. A converter that assumes one fixed gap will be an hour wrong for roughly half the year.
How many hours a week do AEST and IST actually overlap?
20 hours across the week, spread over 5 working days. 2 PM AEST (9:30 AM IST) is the slot that works on the most days, so it is the one to put in a recurring invite.
Do public holidays in AEST and IST line up?
Barely. Over the next eight weeks the two sides share 40 working days, and 6 of those are a public holiday on one side or the other, leaving 34. The next holiday in IST is Gandhi Jayanti on 2026-10-02. Indian, Gulf and Western holiday calendars are built on different systems, so the days each side loses rarely coincide.
Is AEST ahead of IST?
Yes. AEST runs ahead of IST — by 4 hours and 30 minutes or 5 hours and 30 minutes depending on the season, so a working morning in AEST lands the previous evening or night in IST.
Converting the other way
Looking up times starting from IST? Use the IST to AEST converter, which leads with IST as the starting point and is written for that reader.
Related converters
- IST to EST · Eastern Time
- IST to CST · Central Time
- IST to PST · Pacific Time
- IST to UTC · Coordinated Universal Time
- IST to GMT · Greenwich Mean Time
- IST to CET · Central European Time
- IST to GST · Gulf Standard Time
- IST to MST · Mountain Time