IST to AEST Converter & Meeting Planner
Quick answer: 9:00 AM IST = 1:30 PM AEST (fixed +05:30 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indian Standard Time (IST) and Australian Eastern Standard Time (AEST)? You need to account for the standard time difference. Australian Eastern Standard Time is normally 4.5 hours ahead of Indian Standard Time. Whether you are coordinating between teams in Mumbai and New Delhi and Sydney and Melbourne, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM IST = 4:30 AM AEST. The full 24-hour IST to AEST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM IST = 7:30 PM AEST.
| IST Time | AEST Time |
|---|---|
| 12:00 AM (00:00) | 4:30 AM (04:30) |
| 1:00 AM (01:00) | 5:30 AM (05:30) |
| 2:00 AM (02:00) | 6:30 AM (06:30) |
| 3:00 AM (03:00) | 7:30 AM (07:30) |
| 4:00 AM (04:00) | 8:30 AM (08:30) |
| 5:00 AM (05:00) | 9:30 AM (09:30) |
| 6:00 AM (06:00) | 10:30 AM (10:30) |
| 7:00 AM (07:00) | 11:30 AM (11:30) |
| 8:00 AM (08:00) | 12:30 PM (12:30) |
| 9:00 AM (09:00) | 1:30 PM (13:30) |
| 10:00 AM (10:00) | 2:30 PM (14:30) |
| 11:00 AM (11:00) | 3:30 PM (15:30) |
| 12:00 PM (12:00) | 4:30 PM (16:30) |
| 1:00 PM (13:00) | 5:30 PM (17:30) |
| 2:00 PM (14:00) | 6:30 PM (18:30) |
| 3:00 PM (15:00) | 7:30 PM (19:30) |
| 4:00 PM (16:00) | 8:30 PM (20:30) |
| 5:00 PM (17:00) | 9:30 PM (21:30) |
| 6:00 PM (18:00) | 10:30 PM (22:30) |
| 7:00 PM (19:00) | 11:30 PM (23:30) |
| 8:00 PM (20:00) | 12:30 AM (00:30)+1 day |
| 9:00 PM (21:00) | 1:30 AM (01:30)+1 day |
| 10:00 PM (22:00) | 2:30 AM (02:30)+1 day |
| 11:00 PM (23:00) | 3:30 AM (03:30)+1 day |
Best time to call Sydney from Mumbai
For most work calls, compare the normal business day in Mumbai (IST) with the business day in Sydney (AEST). IST commonly covers South Asia, while AEST is mainly associated with Oceania, Australia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:30 AM - 12:30 PM IST, which corresponds to 2:00 PM - 5:00 PM AEST. This window sits inside the typical IST workday (9:30 AM - 6:30 PM) and the AEST workday (9:00 AM - 5:00 PM).
- DST Safety: IST or AEST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Bombay Stock Exchange (BSE): 09:15-15:30 local time in Mumbai.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between IST and AEST?
During standard time, Australian Eastern Standard Time is 4.5 hours ahead of Indian Standard Time.
Does India observe Daylight Saving Time (DST)?
India does not observe Daylight Saving Time and has not done so since 1945. IST remains fixed at UTC+5:30 every day of the year, meaning the offset between India and any DST-observing country shifts by one hour twice annually when those countries change their clocks.
Why does IST have a 30-minute offset?
India chose the 82.5° East meridian — which passes through Mirzapur in Uttar Pradesh — as its central reference longitude, as it bisects the subcontinent geographically. That meridian sits exactly 5 hours and 30 minutes ahead of the Prime Meridian in Greenwich, producing the UTC+5:30 offset that has defined IST since 1906.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.