IST to AEST Converter

AEST is 4.5 hours ahead of IST.

IST 16:31:20

Saturday, October 10, 2026

India Standard Time · UTC+5:30

AEST 21:01:20

Saturday, October 10, 2026

Australian Eastern Standard Time · UTC+10

Convert IST to AEST

IST 16:31 = AEST 21:01

IST to AEST time chart, hour by hour

IST	AEST
00:00	04:30
01:00	05:30
02:00	06:30
03:00	07:30
04:00	08:30
05:00	09:30
06:00	10:30
07:00	11:30
08:00	12:30
09:00	13:30
10:00	14:30
11:00	15:30
12:00	16:30
13:00	17:30
14:00	18:30
15:00	19:30
16:00	20:30
17:00	21:30
18:00	22:30
19:00	23:30
20:00	00:30 +1 day
21:00	01:30 +1 day
22:00	02:30 +1 day
23:00	03:30 +1 day

Highlighted rows fall within 09:00–18:00 in both places: 5 shared working hours.

How many hours is IST behind AEST?

As abbreviations, AEST is always 4.5 hours ahead of IST: IST is UTC+5:30 and AEST is UTC+10. To convert, add 4.5 hours.

Does the IST to AEST time difference change?

No. Aest is 4.5 hours ahead of ist all year, because neither place changes its clocks.

Best time for a meeting between IST and AEST

When AEST is 4.5 hours ahead of IST: 4 shared office hours, 09:00 to 13:00 in IST (13:30 to 17:30 in AEST).

India runs on a single fixed offset, UTC+5:30. Australia’s east coast splits in two directions depending on the season and the city.

IST to AEST: add 4 hours 30 minutes

Australian Eastern Standard Time sits at UTC+10. The difference holds year-round for Brisbane, which never moves its clocks.

If it is 09:00 IST, it is 13:30 AEST.

Why does Sydney’s offset change for IST?

From the first Sunday in October to the first Sunday in April, Sydney, Melbourne, Canberra and Hobart shift to Australian Eastern Daylight Time (AEDT), UTC+11.

IST to AEDT: add 5 hours 30 minutes.

If it is 09:00 IST during Australian summer, it is 14:30 AEDT.

Queensland, the Northern Territory and Western Australia do not observe DST. A January meeting with Brisbane stays on AEST while the same slot in Sydney runs on AEDT.

IST to AEST and AEDT at a glance

IST	AEST (UTC+10)	AEDT (UTC+11)
06:00	10:30	11:30
09:00	13:30	14:30
12:00	16:30	17:30
15:00	19:30	20:30
18:00	22:30	23:30
21:00	01:30 (next day)	02:30 (next day)

What is the best time for a call between IST and AEST?

Standard office hours in India run 09:30 to 18:00 IST. That maps to 14:00 to 22:30 AEST. For AEDT, it is 15:00 to 23:30.

For AEST, aim for 10:00 to 14:00 IST (14:30 to 18:30 AEST).

For AEDT, the window shrinks: 09:00 to 12:00 IST (14:30 to 17:30 AEDT).

If you are calling from India, book early in your day. If you are in Australia, plan for a late afternoon or early evening start.

Frequently asked questions about IST and AEST time

Is Brisbane the same time as Sydney?

No, during Australian summer. Brisbane stays on AEST (UTC+10). Sydney switches to AEDT (UTC+11). The gap between them is one hour.

How do I convert IST to AEST for a meeting in January?

Check the city. For Sydney or Melbourne, use AEDT (add 5h 30m). For Brisbane, use AEST (add 4h 30m). For Adelaide, see IST → ACDT.

Does India ever change its clocks?

No. India Standard Time stays UTC+5:30 year-round. All the movement comes from Australia’s DST.

What is the IANA time zone for the Australian east coast?

For AEST and AEDT, the zones are Australia/Sydney, Australia/Melbourne, Australia/Brisbane, and Australia/Hobart. India uses Asia/Kolkata.

Is 5:30 PM IST always 8:00 PM AEST?

No. 5:30 PM IST is 10:00 PM AEST (add 4h 30m) or 11:00 PM AEDT (add 5h 30m). The half-hour is consistent; the hour depends on the season.

Where can I check the current time in both zones?

Use the IST Converter to see the live time in any Australian zone, or the IST → AEDT page for the DST period.

How many hours ahead is AEST of IST?

AEST (UTC+10) is 4.5 hours ahead of IST (UTC+5:30).

Does the time difference between IST and AEST change during the year?

No, it stays 4.5 hours ahead all year because neither place changes its clocks.