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Timezone converter
IST to AEST currently uses India Time in Asia/Kolkata and Australian Eastern Time in Australia/Sydney as the live reference pair, with a +4h 30m live gap. IST to AEST matters whenever Mumbai and Sydney need to coordinate across a +4h 30m gap. The IST side covers India and Israel, while AEST covers Australia — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.
Last updated recently. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.
IST is ambiguous in this dataset, so the live converter uses Asia/Kolkata as the busiest reference zone while the city list below shows the wider label family.
From
India Time
Asia/Kolkata · GMT+5:30 +05:30
Major markets in this grouping include Mumbai, Delhi, Bengaluru, Hyderabad.
To
Australian Eastern Time
Australia/Sydney · GMT+10 +10:00
Major markets in this grouping include Sydney, Brisbane, Gold Coast, Newcastle.
Current gap
+4h 30m
IST +05:30 vs AEST +10:00
9-to-5 overlap
3.5h
IST 9:00 AM previous day to 12:30 PM previous day
Representative countries
India, Israel, and Sri Lanka / Australia
Based on the busiest city and zone usage found in the current dataset.
IST (Mumbai, +05:30) to AEST (Sydney, +10:00) is currently a +4h 30m conversion. Live coverage on the IST side is anchored by Mumbai, Delhi, Bengaluru, and Hyderabad; the AEST side draws from Sydney, Brisbane, Gold Coast, and Newcastle.
IST to AEST matters whenever Mumbai and Sydney need to coordinate across a +4h 30m gap. The IST side covers India and Israel, while AEST covers Australia — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.
The pair sits +4h 30m apart across Asia and Oceania, which usually allows a meaningful shared workday on at least one end.
AEST follows seasonal clock changes through Australia/Sydney, while IST stays on a fixed offset year-round. The result is a gap that quietly shifts by an hour twice a year — short by an hour in winter (or summer, depending on hemisphere) and back to normal afterwards.
IST and AEST sit 4h 30m apart, with about 3.5h of shared 9-to-5 time. That is enough room for one daily standup plus one focused working session, which is what most cross-region teams actually use this overlap for.
Reference zone, current offsets, country and city anchors, overlap math, and date-shift answers for IST to AEST.
Reference pair
Asia/Kolkata -> Australia/Sydney
Live offsets
IST +05:30 vs AEST +10:00
Meaning split
India Time / Australian Eastern Time
Country anchors
India, Israel, and Sri Lanka -> Australia
City anchors
Mumbai, Delhi, Bengaluru, Hyderabad -> Sydney, Brisbane, Gold Coast, Newcastle
Workday overlap
3.5h window: IST 9:00 AM previous day-12:30 PM previous day
Morning answer
9 AM IST = 1:30 PM AEST, same day
Evening answer
6 PM IST = 10:30 PM AEST, same day
Same-offset labels can share the same hour while still landing in different countries, calendars, cities, and workday windows. These notes show the practical context behind this conversion.
IST to AEST is pinned to Asia/Kolkata -> Australia/Sydney, with the shorthand labels shown as context. The city anchors are Mumbai, Delhi, Bengaluru, Hyderabad on the IST side and Sydney, Brisbane, Gold Coast, Newcastle on the AEST side, with +4h 30m between the live reference zones.
The 12 popular-hour answers include 11 same-day conversions, 1 next-day conversions, and 0 previous-day conversions. That distribution is what separates this page from a static offset chart.
Nearby labels sharing a current offset include AEDT (To side). They may match mathematically, but their country calendars, city anchors, and common search intent differ from this exact pair.
IST: India (IN); 3776 mapped cities; capital New Delhi; English, Hindi, Tamil; INR Indian rupee | IST: Israel (IL); 108 mapped cities; capital Jerusalem; Arabic, Hebrew; ILS Israeli new shekel | IST: Sri Lanka (LK); 60 mapped cities; capital Sri Jayawardenepura Kotte; Sinhala, Tamil; LKR Sri Lankan rupee | AEST: Australia (AU); 137 mapped cities; capital Canberra; English; AUD Australian dollar
Offset behavior, DST gap changes, local calendar evidence, and the day-shift pattern across the most common conversion hours.
IST/AEST is a regional or transcontinental offset gap: Asia/Kolkata currently reads +05:30, Australia/Sydney reads +10:00, and the live delta is +4h 30m. This class decides whether the page behaves like a same-day planner or a handoff planner.
Australia/Sydney changes from +10:00 (GMT+10) to +11:00 (GMT+11) on October 4, 2026 at about 3:00 AM.
No country holiday snapshot is attached to this exact pair yet, so the page leans on city anchors, IANA zones, offsets, and the live conversion table instead of pretending a local calendar exists.
Across the 12 popular-hour answers, this pair has 11 same-day answers, 1 next-day answers, 0 previous-day answers. That mix is specific to the current Asia/Kolkata -> Australia/Sydney relationship and helps users see whether dates must be written explicitly in invites, travel plans, and release schedules.
Same-offset converter clusters can look identical if the page only shows a numeric offset. This audit states whether the route should be indexed, which canonical peer it follows when consolidated, and what pair-specific evidence keeps the page useful.
This pair remains indexable because the route has enough pair-specific context: Asia/Kolkata -> Australia/Sydney, country anchors, city anchors, calendar notes, and day-shift examples.
IST and AEST are not currently a same-offset pair; the live delta is +4h 30m. Same-offset neighbors are still listed because users often confuse nearby abbreviations.
AEDT (To side, +10:00) The page keeps these labels visible so SGT/HKT/GST-style clusters do not blur into one generic offset page.
IST/AEST uses 11 same-day answers, 1 next-day answers, 0 previous-day answers; 3.5h strict workday overlap; source zones Asia/Kolkata and Australia/Sydney; country anchors India, Israel, and Sri Lanka -> Australia.
Common places, calendars, markets, languages, and operating contexts behindIST and AEST.
AEST
AEST is Australian Eastern Standard Time, commonly used for Brisbane, parts of Queensland, and eastern-Australia winter schedules. It is not interchangeable with AEDT because Queensland does not follow the same daylight-saving behavior as Sydney or Melbourne.
AEST
AEST planning often means Australian business handoffs, mining and energy operations in Queensland, Brisbane flight timing, and cross-state scheduling where one Australian city may switch clocks while another does not.
Same-offset conversions can still land in different public-holiday, language, currency, and city-anchor contexts. These rows use the country profile and holiday snapshots behind each side of the pair.
IST
3,776 mapped city anchors; zones Asia/Kolkata.capital New Delhi; English, Hindi, Tamil; INR Indian rupee
Holiday snapshot: Republic Day (Jan 26, Public) · Holi (Mar 4, Public) · Eid al-Fitr (Mar 21, Public) · Mahavir Jayanti (Mar 31, Public) · Good Friday (Apr 3, Public)
IST
108 mapped city anchors; zones Asia/Jerusalem.capital Jerusalem; Arabic, Hebrew; ILS Israeli new shekel
Holiday snapshot: No holiday snapshot attached for the current year.
IST
60 mapped city anchors; zones Asia/Colombo.capital Sri Jayawardenepura Kotte; Sinhala, Tamil; LKR Sri Lankan rupee
Holiday snapshot: No holiday snapshot attached for the current year.
AEST
137 mapped city anchors; zones Australia/Brisbane, Australia/Sydney.capital Canberra; English; AUD Australian dollar
Holiday snapshot: New Year's Day (Jan 1, Public) · Australia Day (Jan 26, Public) · Labour Day (Mar 2, Public) · Canberra Day (Mar 9, Public) · Adelaide Cup Day (Mar 9, Public)
These are the labels most likely to be confused with either side of this conversion. A matching UTC offset does not mean the same country, calendar, market, source convention, or user intent.
IST and IOT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
IST and AFT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
IST and BST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
IST and BTT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
IST and CCT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
IST and FSAT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
AEST and AEDT match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
AEST and ACDT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
AEST and ACST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
AEST and ACWST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
AEST and AWST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
AEST and WIT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.
Abbreviations with the same UTC offset can still represent different countries, cities, currencies, languages, and civil-time histories. This roster keeps theIST to AEST page grounded in those concrete places.
IST: India (IN); 3776 mapped cities; zones Asia/Kolkata; city anchors Mumbai (Asia/Kolkata, pop 12,691,836), Delhi (Asia/Kolkata, pop 11,034,555), Bengaluru (Asia/Kolkata, pop 8,495,492), Hyderabad (Asia/Kolkata, pop 6,993,262); official Republic of India; capital New Delhi; region Asia; subregion Southern Asia; population 1,417,492,000; area 3,287,263 km2; languages English, Hindi, Tamil; currency INR Indian rupee.
IST: Israel (IL); 108 mapped cities; zones Asia/Jerusalem; city anchors Jerusalem (Asia/Jerusalem, pop 971,800), Tel Aviv (Asia/Jerusalem, pop 432,892), West Jerusalem (Asia/Jerusalem, pop 400,000), Haifa (Asia/Jerusalem, pop 285,316); official State of Israel; capital Jerusalem; region Asia; subregion Western Asia; population 10,134,800; area 21,937 km2; languages Arabic, Hebrew; currency ILS Israeli new shekel.
IST: Sri Lanka (LK); 60 mapped cities; zones Asia/Colombo; city anchors Colombo (Asia/Colombo, pop 648,034), Dehiwala-Mount Lavinia (Asia/Colombo, pop 219,827), Maharagama (Asia/Colombo, pop 195,355), Jaffna (Asia/Colombo, pop 169,102); official Democratic Socialist Republic of Sri Lanka; capital Sri Jayawardenepura Kotte; region Asia; subregion Southern Asia; population 21,763,170; area 65,610 km2; languages Sinhala, Tamil; currency LKR Sri Lankan rupee.
AEST: Australia (AU); 137 mapped cities; zones Australia/Brisbane, Australia/Sydney; city anchors Sydney (Australia/Sydney, pop 5,557,233), Brisbane (Australia/Brisbane, pop 2,780,063), Gold Coast (Australia/Brisbane, pop 640,778), Newcastle (Australia/Sydney, pop 508,437); official Commonwealth of Australia; capital Canberra; region Oceania; subregion Australia and New Zealand; population 27,536,874; area 7,692,024 km2; languages English; currency AUD Australian dollar.
Same-offset converter pages can look deceptively alike. These records pin the page to the exact abbreviations, IANA zones, countries, and city anchors behind IST and AEST.
IST (ist) is ambiguous in the abbreviation catalog. Meaning records: Israel Time at UTC+02:00; listed zones Asia/Jerusalem; source label Israel Time - Jerusalem, Tel Aviv, West Jerusalem, Haifa | India Time at UTC+05:30; listed zones Asia/Colombo; Asia/Kolkata; source label India Time - Colombo, Dehiwala-Mount Lavinia, Maharagama, Jaffna.
IST currently maps to 3 country footprints in the converter dataset: India (IN), Israel (IL), Sri Lanka (LK). The footprint spans 3 IANA zones across 10 city anchors.
IST city anchors in this indexed page family: Mumbai [mumbai-IN, IN, Asia/Kolkata, pop 12,691,836]; Delhi [delhi-IN, IN, Asia/Kolkata, pop 11,034,555]; Bengaluru [bengaluru-IN, IN, Asia/Kolkata, pop 8,495,492]; Hyderabad [hyderabad-IN, IN, Asia/Kolkata, pop 6,993,262]; Ahmedabad [ahmedabad-IN, IN, Asia/Kolkata, pop 6,357,693]; Chennai [chennai-IN, IN, Asia/Kolkata, pop 4,681,087]; Kolkata [kolkata-IN, IN, Asia/Kolkata, pop 4,631,392]; Surat [surat-IN, IN, Asia/Kolkata, pop 4,591,246]; Pune [pune-IN, IN, Asia/Kolkata, pop 3,124,458]; Jaipur [jaipur-IN, IN, Asia/Kolkata, pop 3,046,163].
IST: India (IN); 3776 mapped cities; zones Asia/Kolkata; city anchors Mumbai (Asia/Kolkata, pop 12,691,836), Delhi (Asia/Kolkata, pop 11,034,555), Bengaluru (Asia/Kolkata, pop 8,495,492), Hyderabad (Asia/Kolkata, pop 6,993,262); official Republic of India; capital New Delhi; region Asia; subregion Southern Asia; population 1,417,492,000; area 3,287,263 km2; languages English, Hindi, Tamil; currency INR Indian rupee. IST: Israel (IL); 108 mapped cities; zones Asia/Jerusalem; city anchors Jerusalem (Asia/Jerusalem, pop 971,800), Tel Aviv (Asia/Jerusalem, pop 432,892), West Jerusalem (Asia/Jerusalem, pop 400,000), Haifa (Asia/Jerusalem, pop 285,316); official State of Israel; capital Jerusalem; region Asia; subregion Western Asia; population 10,134,800; area 21,937 km2; languages Arabic, Hebrew; currency ILS Israeli new shekel. IST: Sri Lanka (LK); 60 mapped cities; zones Asia/Colombo; city anchors Colombo (Asia/Colombo, pop 648,034), Dehiwala-Mount Lavinia (Asia/Colombo, pop 219,827), Maharagama (Asia/Colombo, pop 195,355), Jaffna (Asia/Colombo, pop 169,102); official Democratic Socialist Republic of Sri Lanka; capital Sri Jayawardenepura Kotte; region Asia; subregion Southern Asia; population 21,763,170; area 65,610 km2; languages Sinhala, Tamil; currency LKR Sri Lankan rupee.
AEST (aest) is not marked ambiguous in the abbreviation catalog. Meaning records: Australian Eastern Time at UTC+10:00; listed zones Australia/Brisbane; Australia/Sydney; source label Australian Eastern Time - Brisbane, Gold Coast, Sunshine Coast, Logan City.
AEST currently maps to 1 country footprint in the converter dataset: Australia (AU). The footprint spans 2 IANA zones across 10 city anchors.
AEST city anchors in this indexed page family: Sydney [sydney-AU, AU, Australia/Sydney, pop 5,557,233]; Brisbane [brisbane-AU, AU, Australia/Brisbane, pop 2,780,063]; Gold Coast [gold-coast-AU, AU, Australia/Brisbane, pop 640,778]; Newcastle [newcastle-AU, AU, Australia/Sydney, pop 508,437]; Canberra [canberra-AU, AU, Australia/Sydney, pop 367,752]; Central Coast [central-coast-AU, AU, Australia/Sydney, pop 346,596]; Sunshine Coast [sunshine-coast-AU, AU, Australia/Brisbane, pop 346,522]; Logan City [logan-city-AU, AU, Australia/Brisbane, pop 345,098]; Wollongong [wollongong-AU, AU, Australia/Sydney, pop 280,153]; Townsville [townsville-AU, AU, Australia/Brisbane, pop 201,313].
AEST: Australia (AU); 137 mapped cities; zones Australia/Brisbane, Australia/Sydney; city anchors Sydney (Australia/Sydney, pop 5,557,233), Brisbane (Australia/Brisbane, pop 2,780,063), Gold Coast (Australia/Brisbane, pop 640,778), Newcastle (Australia/Sydney, pop 508,437); official Commonwealth of Australia; capital Canberra; region Oceania; subregion Australia and New Zealand; population 27,536,874; area 7,692,024 km2; languages English; currency AUD Australian dollar.
IST is reused across 2 different meanings in this dataset — India Time and Israel Time — which is why the short code alone is not enough to identify a place. Each meaning maps to its own IANA zone family and its own DST behavior, and they happen to share the same letters by historical accident more than by design. The busiest cities using IST in the current catalog are Mumbai, Delhi, Bengaluru, Hyderabad, and Ahmedabad. The lead live reference on this page is Mumbai (Asia/Kolkata), currently at +05:30 (GMT+5:30). Those cities are what give IST its actual feel rather than the abstract offset. Because IST spans UTC+02:00 to UTC+05:30 across the active meanings, software, calendars, and contracts should always pin a specific IANA zone such as Asia/Kolkata or a literal UTC offset. The short label is fine for headlines and chat; it is the wrong primitive for storing or scheduling timestamps.
IST appears with 2 distinct meanings in current data, splitting across UTC+02:00 to UTC+05:30. The short label looks tidy in writing but quietly hides which place you mean — pick a city, a country, or an IANA zone before it matters. Asia/Kolkata does not show an offset change in the next year, which makes IST predictable for short-term scheduling. Predictable is not the same as permanent — civil-time rules still get changed by governments on relatively short notice. For precise work, the safest equivalent of IST is the exact IANA zone used by your city or system. Asia/Kolkata sits at +05:30, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.
IST should not be blindly swapped with nearby labels. Adjacent references in the catalog: IOT (+06:00, Runs on a nearby UTC offset); AFT (+04:30, Runs on a nearby UTC offset); BST (+06:00, Runs on a nearby UTC offset); BTT (+06:00, Runs on a nearby UTC offset); CCT (+06:30, Runs on a nearby UTC offset); FSAT (+05:00, Runs on a nearby UTC offset).
IST has 2 meaning records, offset range UTC+02:00 to UTC+05:30, labels India Time, Israel Time, and 3 country footprints across 3 IANA zones.
AEST is used in this dataset for Australian Eastern Time. Right now it maps to 1 meaning, 2 IANA zones, and 1 country. The busiest cities using AEST in the current catalog are Sydney, Brisbane, Gold Coast, Newcastle, and Canberra. The lead live reference on this page is Sydney (Australia/Sydney), currently at +10:00 (GMT+10). Those cities are what give AEST its actual feel rather than the abstract offset. AEST currently shows +10:00, but Australia/Sydney observes seasonal clock changes — the next transition is around October 4, 2026. That means the offset on this page is a snapshot, not a permanent fact, so long-range scheduling should pin the underlying IANA zone instead of the abbreviation.
AEST is not heavily split in the current catalog, but the short label still hides the underlying IANA zone and any future policy change. The safe pattern is to write the abbreviation for humans and the zone for machines. Australia/Sydney has an upcoming offset change on October 4, 2026. After that point, AEST on this page will read a different UTC offset until the next transition, so any saved timestamp should anchor to the IANA zone rather than the abbreviation. For precise work, the safest equivalent of AEST is the exact IANA zone used by your city or system. Australia/Sydney sits at +10:00, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.
AEST should not be blindly swapped with nearby labels. Adjacent references in the catalog: AEDT (+10:00, Shares the australian and eastern time family); ACDT (+09:30, Shares the australian time family); ACST (+09:30, Shares the australian time family); ACWST (+08:45, Shares the australian time family); AWST (+08:00, Shares the australian time family); WIT (+09:00, Shares the eastern time family).
AEST has 1 meaning record, offset range UTC+10:00 to UTC+11:00, labels Australian Eastern Time, and 1 country footprint across 2 IANA zones.
IST country anchor India: India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area; the most populous country in the world and, since its independence in 1947, the world's most populous democracy. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal and Bhutan to the north; Bangladesh and Myanmar to the east. In the Indian Ocean, India is near Sri Lanka and the Maldives. Its Andaman and Nicobar Islands share a maritime border with Myanmar, Thailand and Indonesia. Source: Wikipedia.
AEST country anchor Australia: Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It has a land area of 7,688,287 km2 (2,968,464 sq mi), making it the sixth-largest country in the world. Australia is the world's flattest and driest inhabited continent. It is a megadiverse country, and its size gives it a wide variety of landscapes and climates including deserts in the interior and tropical rainforests along the coast. Source: Wikipedia.
AEST is Australian Eastern Standard Time, commonly used for Brisbane, parts of Queensland, and eastern-Australia winter schedules. It is not interchangeable with AEDT because Queensland does not follow the same daylight-saving behavior as Sydney or Melbourne.
AEST planning often means Australian business handoffs, mining and energy operations in Queensland, Brisbane flight timing, and cross-state scheduling where one Australian city may switch clocks while another does not.
IST/AEST uses Asia/Kolkata -> Australia/Sydney, offset delta +4h 30m, overlap 3.5h, route /convert/ist/aest/, and live abbreviation readings GMT+5:30/GMT+10.
Reference fields include this converter pair's abbreviation records, representative IANA zones, current offsets, city anchors, country profiles, overlap math, conversion examples, and dossier notes.
IST coverage on this page is led by Mumbai, India, Delhi, India, Bengaluru, India, and Hyderabad, India, with 2 more in the live dataset. That mix is what makes IST feel anchored to South and Southeast Asian business hubs in practice rather than just an abbreviation on a chart.
AEST coverage is led by Sydney, Australia, Brisbane, Australia, Gold Coast, Australia, and Newcastle, Australia, with 2 more anchoring the wider label family. Combined with the IST side, this conversion ends up describing cross-region coordination that uses the morning-on-one-side, afternoon-on-the-other window for live work.
Adjust the time. Digits roll like an odometer, and the swap button flips the zones.
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| IST | AEST | Day relation |
|---|---|---|
| 9:00 AM | 1:30 PMMon, May 25 | same day |
| 12:00 PM | 4:30 PMMon, May 25 | same day |
| 3:00 PM | 7:30 PMMon, May 25 | same day |
| 6:00 PM | 10:30 PMMon, May 25 | same day |
| 9:00 PM | 1:30 AMTue, May 26 | next day |
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| AEST | IST | Day relation |
|---|---|---|
| 9:00 AM | 4:30 AMMon, May 25 | same day |
| 12:00 PM | 7:30 AMMon, May 25 | same day |
| 3:00 PM | 10:30 AMMon, May 25 | same day |
| 6:00 PM | 1:30 PMMon, May 25 | same day |
| 9:00 PM | 4:30 PMMon, May 25 | same day |
IST to AEST ranges from IST 9:00 AM (which lands at AEST 1:30 PM) through IST 9:00 PM (AEST 1:30 AM). Across this +4h 30m gap, the middle of the IST range usually lands in the AEST afternoon — the reliable window for live calls between the two — while the early and late edges drift into AEST morning or evening.
AEST to IST ranges from AEST 9:00 AM (which lands at IST 4:30 AM) through AEST 9:00 PM (IST 4:30 PM). Across this +4h 30m gap, the middle of the AEST range usually lands in the IST afternoon — the reliable window for live calls between the two — while the early and late edges drift into IST morning or evening.
These direct answers are here for the exact-intent searches people actually use, like “10 AM IST to AEST” or “4 PM IST in AEST”.
8 AM IST = 12:30 PM AEST (12:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
9 AM IST = 1:30 PM AEST (13:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
10 AM IST = 2:30 PM AEST (14:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
11 AM IST = 3:30 PM AEST (15:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
12 PM IST = 4:30 PM AEST (16:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
1 PM IST = 5:30 PM AEST (17:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
2 PM IST = 6:30 PM AEST (18:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
3 PM IST = 7:30 PM AEST (19:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
4 PM IST = 8:30 PM AEST (20:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
5 PM IST = 9:30 PM AEST (21:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
6 PM IST = 10:30 PM AEST (22:30). On today's live calendar that lands on Mon, May 25 in AEST, which means the answer is a same day conversion rather than a static offset lookup.
9 PM IST = 1:30 AM AEST (01:30). On today's live calendar that lands on Tue, May 26 in AEST, which means the answer is a next day conversion rather than a static offset lookup.
The live gap is +4h 30m right now, based on Asia/Kolkata at +05:30 and Australia/Sydney at +10:00. Australia/Sydney changes offset on October 4, 2026, so the gap moves to +5h 30m after that transition.
The most usable workday block right now is about 3.5 hours: IST 9:00 AM previous day to 12:30 PM previous day, which lines up with AEST 1:30 PM previous day to 5:00 PM previous day.
Asia/Kolkata
GMT+5:30 · +05:30
Australia/Sydney
GMT+10 · +10:00
These are the busiest live references selected from the abbreviation families on this page.
| IST | AEST |
|---|---|
| 05:30 | 10:00 |
| 06:30 | 11:00 |
| 07:30 | 12:00 |
| 08:30 | 13:00 |
| 09:30 | 14:00 |
| 10:30 | 15:00 |
| 11:30 | 16:00 |
| 12:30 | 17:00 |
| 13:30 | 18:00 |
| 14:30 | 19:00 |
| 15:30 | 20:00 |
| 16:30 | 21:00 |
| 17:30 | 22:00 |
| 18:30 | 23:00 |
| 19:30 | 00:00 |
| 20:30 | 01:00 |
| 21:30 | 02:00 |
| 22:30 | 03:00 |
| 23:30 | 04:00 |
| 00:30 | 05:00 |
| 01:30 | 06:00 |
| 02:30 | 07:00 |
| 03:30 | 08:00 |
| 04:30 | 09:00 |
Countries represented here include India, Israel, and Sri Lanka.
Countries represented here include Australia.
Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.
Interactive converter
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