AEST ↔ IST Time Converter

Convert AEST to IST instantly. Australian Eastern Standard Time is UTC+10 / UTC+11 (AEDT) and India Standard Time is UTC+5:30 — a 4h 30m difference (5h 30m while Sydney is on AEDT). Enter any time in either field — both fully editable. Click ⇄ to swap directions.

🕐 Live Current Times

AEST
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Australian Eastern Standard Time
4h 30m behind
⇄ IST→AEST
IST
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India Standard Time

⚡ Bidirectional Time Converter

AEST (UTC+10 / UTC+11 (AEDT)) → IST (UTC+5:30) · Difference: 4h 30m behind (auto-adjusts for DST)

ℹ️ Timezone Details

AEST Offset
UTC+10 / UTC+11 (AEDT)
IST Offset
UTC+5:30
Difference
4h 30m behind
AEST Full Name
Australian Eastern Standard Time
IST Full Name
India Standard Time
Vice Versa
IST → AEST ↗

🤝 Best Meeting Hours Between AEST and IST

Because IST is 4h 30m behind AEST, the Australian afternoon lines up with the Indian morning. Use this table to find windows where both sides fall within reasonable working hours (shown for standard time; while Sydney is on AEDT, add one hour to the AEST column). Click a row to load it into the converter.

AESTISTSuitability
1:00 PM8:30 AMGood — early IST start
2:00 PM9:30 AMBest overlap
3:00 PM10:30 AMBest overlap
4:00 PM11:30 AMBest overlap
5:00 PM12:30 PMBest overlap
6:00 PM1:30 PMGood — late AEST window

🏙️ Cities Covered by Each Time Zone

AEST Cities
Sydney, Melbourne, Brisbane, Canberra, Hobart, Newcastle, Gold Coast
IST Cities
Delhi, Mumbai, Bengaluru, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad

📌 Zone Notes — AEST & IST

AEST: Australian Eastern Standard Time (AEST) is UTC+10. New South Wales, Victoria, Tasmania, and the ACT observe Daylight Saving Time and shift to AEDT (UTC+11) from the first Sunday in October to the first Sunday in April. Queensland does not observe DST and stays at AEST/UTC+10 all year. The live clocks on this page use the Sydney IANA zone, which includes the DST shift, and the badge changes from AEST to AEDT in summer. If you are scheduling with Brisbane specifically, note that Queensland remains at UTC+10 during the AEDT period.

IST: India Standard Time (IST) is UTC+5:30 all year. India does not observe Daylight Saving Time, and one time zone covers the whole country. Sri Lanka uses the same UTC+5:30 offset. In this converter IST always means India Standard Time, not Irish Standard Time or Israel Standard Time, which share the same letters.

🌤️ Daylight Saving Time (DST) — What to Know

Only the AEST side changes its clocks. IST stays at UTC+5:30 all year. From the first Sunday in April to the first Sunday in October, Sydney is on AEST (UTC+10) and the gap with India is 4h 30m. From the first Sunday in October to the first Sunday in April, Sydney is on AEDT (UTC+11) and the gap is 5h 30m. The live converter always reflects the accurate real-time offset.

📋 Full 24-Hour Conversion Table — AEST to IST

AEST (12h)AEST (24h)IST (12h)IST (24h)DayType
12:00 AM00:007:30 PM19:30-1 DayNight
1:00 AM01:008:30 PM20:30-1 DayNight
2:00 AM02:009:30 PM21:30-1 DayNight
3:00 AM03:0010:30 PM22:30-1 DayNight
4:00 AM04:0011:30 PM23:30-1 DayNight
5:00 AM05:0012:30 AM00:30—Night
6:00 AM06:001:30 AM01:30—
7:00 AM07:002:30 AM02:30—
8:00 AM08:003:30 AM03:30—
9:00 AM09:004:30 AM04:30—Business
10:00 AM10:005:30 AM05:30—Business
11:00 AM11:006:30 AM06:30—Business
12:00 PM12:007:30 AM07:30—Business
1:00 PM13:008:30 AM08:30—Business
2:00 PM14:009:30 AM09:30—Business
3:00 PM15:0010:30 AM10:30—Business
4:00 PM16:0011:30 AM11:30—Business
5:00 PM17:0012:30 PM12:30—Business
6:00 PM18:001:30 PM13:30—
7:00 PM19:002:30 PM14:30—
8:00 PM20:003:30 PM15:30—
9:00 PM21:004:30 PM16:30—
10:00 PM22:005:30 PM17:30—Night
11:00 PM23:006:30 PM18:30—Night

Table uses the fixed standard offset of 4h 30m behind (AEST, UTC+10). While Sydney is on AEDT the actual gap is 5h 30m, so subtract one more hour — or use the live converter above, which adjusts automatically.

🔗 Related Converters

🔄 IST ↔ AEST🔄 AEST ↔ CST🔄 EST ↔ IST🔄 IST ↔ EST🔄 GMT ↔ IST🔄 IST ↔ GMT🔄 IST ↔ JST🔄 IST ↔ SGT🔄 EST ↔ GMT🔄 PST ↔ EST

💡 How to Convert AEST to IST

1
Find the offset — Australian Eastern Standard Time is UTC+10 / UTC+11 (AEDT) and India Standard Time is UTC+5:30. Difference: 4h 30m behind (5h 30m while Sydney is on AEDT).
2
Use either field — Type in the AEST box for the IST result, or type in the IST box for the AEST result. Both update instantly.
3
Swap directions — Click ⇄ to reverse, or visit the IST to AEST page.
4
Check the table — The 24-hour table shows every hour converted; business hours in green, late-night in orange. Click any row to load it into the converter.
5
Watch for day changes — "-1 Day" flags appear automatically when a conversion crosses midnight, so you never book on the wrong date.

❓ Frequently Asked Questions — AEST to IST

What is the time difference between AEST and IST?

India Standard Time (IST) is 4 hours 30 minutes behind Australian Eastern Standard Time (AEST). AEST is UTC+10 and IST is UTC+5:30. While Sydney, Melbourne, Canberra and Hobart are on daylight time (AEDT, UTC+11, from October to April), the gap is 5 hours 30 minutes. Examples at standard time: 8:00 AM AEST = 3:30 AM IST; 12:00 PM AEST = 7:30 AM IST; 5:00 PM AEST = 12:30 PM IST.

How do I convert AEST to IST manually?

Subtract 4 hours 30 minutes from the AEST time (5 hours 30 minutes while Sydney is on AEDT). For example, 12:00 PM AEST becomes 7:30 AM IST. When the result goes before midnight, move the date back by one day (shown as "-1 Day" in the converter). The converter on this page handles the arithmetic and the date change automatically.

Is IST ahead of or behind AEST?

India Standard Time (IST) is 4 hours 30 minutes behind Australian Eastern Standard Time (AEST). Reversed, AEST is 4 hours 30 minutes ahead of IST. For example, 9:00 AM in Delhi (IST) is 1:30 PM AEST in Sydney.

What is AEST — Australian Eastern Standard Time?

Australian Eastern Standard Time (AEST) is UTC+10, the standard time of Sydney, Melbourne, Brisbane, Canberra and Hobart. New South Wales, Victoria, Tasmania and the ACT move to AEDT (UTC+11) from October to April, but Queensland stays on AEST all year. Major cities: Sydney, Melbourne, Brisbane, Canberra, Hobart, Newcastle, Gold Coast.

What is IST — India Standard Time?

India Standard Time (IST) is UTC+5:30 and is used across the whole of India. India does not observe daylight saving time, so IST never changes. Sri Lanka uses the same UTC+5:30 offset. The letters IST are also used for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2), but this page always means India Standard Time.

Does Daylight Saving Time affect the AEST to IST difference?

Yes, but only on the Australian side. India never changes its clocks, while New South Wales, Victoria, Tasmania and the ACT move to AEDT (UTC+11) from the first Sunday in October to the first Sunday in April. During that period the gap with India is 5 hours 30 minutes instead of 4 hours 30 minutes. The live converter reads the Sydney time zone, so it always shows the current gap.

What is the best time to schedule a meeting between AEST and IST?

The best window is 2:00 PM to 5:00 PM AEST, which is 9:30 AM to 12:30 PM IST, so both sides are inside normal working hours. While Sydney is on AEDT, the same window is 3:00 PM to 6:00 PM in Sydney. Avoid times where India is before 7 AM or after 9 PM, which means Sydney before 11:30 AM or after 1:30 AM at standard time. The meeting hours table above shows the exact slots.

How do I convert IST back to AEST?

Type any time directly into the IST field in the converter above and it shows the AEST result instantly, or add 4 hours 30 minutes to the IST time yourself. For a dedicated reverse page, visit: IST to AEST converter ↗.

Do AEST to IST conversions cross midnight?

Yes. At standard time, AEST times from 12:00 AM to 4:29 AM land on the previous day in IST. For example, 2:00 AM AEST is 9:30 PM IST on the previous day. The converter shows "-1 Day" when the date moves back, and the Day column of the 24-hour table shows it too. Always check the date when you send invites between these two zones.

Which cities use AEST and IST?

AEST is used in Sydney, Melbourne, Brisbane, Canberra, Hobart, Newcastle and Gold Coast (the first four and Newcastle use AEDT in summer). IST is used in Delhi, Mumbai, Bengaluru, Kolkata, Chennai, Hyderabad, Pune and Ahmedabad, and everywhere else in India.

Is 4 hours 30 minutes always the exact difference between AEST and IST?

It is the difference whenever Australia is on standard time (AEST, UTC+10), which is from the first Sunday in April to the first Sunday in October. For the rest of the year it is 5 hours 30 minutes in Sydney, Melbourne, Canberra and Hobart. Brisbane and the rest of Queensland keep AEST all year, so the gap there stays at 4 hours 30 minutes.

How do I set up a recurring calendar event between AEST and IST?

Set the event time zone in your calendar app with IANA names: Australia/Sydney (or Australia/Melbourne) for AEST and Asia/Kolkata for IST. IANA names, rather than fixed UTC offsets, let the calendar adjust future meetings automatically when Australia changes its clocks, so the Indian side does not end up an hour early or late. Use the converter on this page to check both sides before you send the invite.

What is the difference between AEST and AEDT?

AEST (Australian Eastern Standard Time) is UTC+10 and applies from about April to October. AEDT (Australian Eastern Daylight Time) is UTC+11 and applies from October to April in New South Wales, Victoria, Tasmania and the ACT. Queensland does not observe daylight saving time and stays on AEST. The live clocks on this page follow Sydney, so the badge changes to AEDT in summer. For Brisbane, add one hour to any IST result during the AEDT months.