AEST to IST Converter

Live Antipodal Globe & Offset Dial

Common Sydney–India Handover Slots

One-click presets for standups, handovers, and family calls.

AEST → IST Conversion Table

Need the reverse? Try IST to EST or use the Swap button above for India → Sydney.

The Offset Formula

Australia ↔ India Zone Reference

No saved conversions yet. Set a Sydney time and tap "Save to History" to remember up to six.

How to Convert AEST to IST

1. Enter the Sydney clock time in the time field — for example 3:00 PM.
2. Toggle the daylight-saving switch: AEST (−4:30) for the Australian winter or AEDT (−5:30) for summer.
3. Read India time off the offset dial — the amber hand trails the teal Sydney hand by exactly the gap.
4. Watch for a "prev day" flag on the India card; because India is behind, late Sydney times can roll back a calendar day.
5. Save the conversion to history to rebuild a recurring meeting slot later.

Why AEST and IST Sit 4h30 Apart

In 2026, a Sydney project manager running a delivery team split between Parramatta and Pune needs to know — at a glance, without doing arithmetic in their head at 9 AM — exactly what time their Indian colleagues are seeing on the clock. AEST to IST answers that one question: India Standard Time runs 4 hours and 30 minutes behind Australian Eastern Standard Time, and 5 hours and 30 minutes behind when Sydney shifts into Australian Eastern Daylight Time (AEDT). This converter renders both cities on an antipodal globe with a great-circle arc and a fixed offset dial so the answer is visual, not mental math.

Australian Eastern Standard Time (AEST) is UTC+10:00, the legal time of New South Wales, Victoria, Queensland, Tasmania, and the Australian Capital Territory in winter. India Standard Time (IST) is UTC+05:30, a single nationwide zone covering the whole subcontinent from Kanyakumari to Leh. The 4-hour-30-minute gap is the difference between UTC+10 and UTC+5:30. The half-hour component exists because India, like Newfoundland and parts of central Australia, chose a 30-minute offset from the hour grid when it standardised its time in 1906.

The complication is Australian daylight saving. New South Wales, Victoria, the ACT, Tasmania, and South Australia observe DST from the first Sunday of October to the first Sunday of April, advancing the clock one hour to AEDT (UTC+11). India does not observe daylight saving at all — it has not done so since the brief experiments around the 1962 and 1971 wars. So for roughly half the year (the Australian summer) the gap widens to 5 hours 30 minutes, and for the other half it sits at 4 hours 30 minutes. Queensland never moves, so Brisbane stays 4h30 ahead of India year-round.

India Standard Time is anchored to the clock tower of the Mirzapur observatory near the 82.5°E meridian, chosen because it sits almost exactly midway across the country. Before 1906 Calcutta (Kolkata) and Bombay (Mumbai) kept separate local times nearly 39 minutes apart, a relic of British railway and telegraph practice. The unification under a single +5:30 zone, formalised on 1 January 1906, is why India never split into the two zones that its 3,000-kilometre east-west span would otherwise justify — a recurring debate in Indian policy circles, especially for Assam tea estates that run on unofficial 'Bagan time'.

Australia, by contrast, is genuinely multi-zone: AEST (UTC+10), ACST (UTC+9:30, Adelaide and Darwin), and AWST (UTC+8, Perth). The 'Eastern' in AEST is the most populous zone, holding Sydney, Melbourne, Brisbane, and Canberra. Sydney and Indian cities like Mumbai and Bengaluru sit almost antipodally across the Indian Ocean — a great-circle flight covers roughly 10,150 km, about 12 to 13 hours nonstop, which is why the offset feels so large despite both being in the Eastern Hemisphere.

The practical workflow this tool supports is the cross-border working day. With IST 4h30 behind, a 9 AM Sydney start is only 4:30 AM in India — too early — but a 12 PM Sydney slot lands at 7:30 AM India, and a 3 PM Sydney handover hits 10:30 AM India, squarely inside the overlap window where both teams are awake. The presets encode exactly these handover moments. The history panel remembers your last six conversions so you can rebuild a recurring meeting slot without re-entering the time each week.

For travellers and finance desks, the AEST-IST relationship matters beyond meetings. The ASX (Australian Securities Exchange) opens at 10:00 AM AEST, which is 4:30 AM IST in winter and 3:30 AM IST in the Australian summer — relevant for Indian traders watching APAC markets. Conversely, India's NSE opens at 9:15 AM IST, which is 1:45 PM AEST (2:45 PM AEDT). This converter treats the offset as the single source of truth and lets you flip direction with the Swap button so India-to-Sydney works just as cleanly.