Timezone converter
IST to JST currently uses India Time in Asia/Kolkata and Japan Time in Asia/Tokyo as the live reference pair, with a +3h 30m live gap. IST and JST connects India and Japan, separated by 3.5 hours. This conversion shows up in manufacturing calls, automotive supply chains, and the late-morning India to early-afternoon Japan window where both teams are simultaneously productive.
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
Japan Time
Asia/Tokyo · GMT+9 +09:00
Major markets in this grouping include Tokyo, Yokohama, Osaka, Nagoya.
Current gap
+3h 30m
IST +05:30 vs JST +09:00
9-to-5 overlap
4.5h
IST 9:00 AM previous day to 1:30 PM previous day
Representative countries
India, Israel, and Sri Lanka / Japan
Based on the busiest city and zone usage found in the current dataset.
IST (Mumbai, +05:30) to JST (Tokyo, +09:00) is currently a +3h 30m conversion. Live coverage on the IST side is anchored by Mumbai, Delhi, Bengaluru, and Hyderabad; the JST side draws from Tokyo, Yokohama, Osaka, and Nagoya.
IST and JST connects India and Japan, separated by 3.5 hours. This conversion shows up in manufacturing calls, automotive supply chains, and the late-morning India to early-afternoon Japan window where both teams are simultaneously productive.
Both reference zones sit inside Asia, so this is a regional comparison rather than a long-haul conversion. The gap of +3h 30m mostly affects intra-continental travel, regional logistics, and Asia-wide calendars.
Neither IST nor JST observes daylight saving on the reference zones used here, so the gap stays steady all year. That makes this pair predictable for recurring meetings, broadcast schedules, and contracts that care about a stable offset.
IST and JST sit 3h 30m apart, leaving a generous 4.5h of shared 9-to-5 time. With that much overlap, this pair behaves almost like a single workday, so meeting times are negotiable rather than forced into a narrow corner of the calendar.
Reference zone, current offsets, country and city anchors, overlap math, and date-shift answers for IST to JST.
Reference pair
Asia/Kolkata -> Asia/Tokyo
Live offsets
IST +05:30 vs JST +09:00
Meaning split
India Time / Japan Time
Country anchors
India, Israel, and Sri Lanka -> Japan
City anchors
Mumbai, Delhi, Bengaluru, Hyderabad -> Tokyo, Yokohama, Osaka, Nagoya
Workday overlap
4.5h window: IST 9:00 AM previous day-1:30 PM previous day
Morning answer
9 AM IST = 12:30 PM JST, same day
Evening answer
6 PM IST = 9:30 PM JST, 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 JST is pinned to Asia/Kolkata -> Asia/Tokyo, with the shorthand labels shown as context. The city anchors are Mumbai, Delhi, Bengaluru, Hyderabad on the IST side and Tokyo, Yokohama, Osaka, Nagoya on the JST side, with +3h 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 GMT+9 (To side), KST (To side), PWT (To side), WIT (To side), YAKT (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 | JST: Japan (JP); 1296 mapped cities; capital Tokyo; Japanese; JPY Japanese yen
Offset behavior, DST gap changes, local calendar evidence, and the day-shift pattern across the most common conversion hours.
IST/JST is a regional or transcontinental offset gap: Asia/Kolkata currently reads +05:30, Asia/Tokyo reads +09:00, and the live delta is +3h 30m. This class decides whether the page behaves like a same-day planner or a handoff planner.
Asia/Kolkata and Asia/Tokyo do not show a detected near-term DST gap-change note in this sample, but the page still exposes exact IANA zones so users do not treat the abbreviation pair as permanently fixed.
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 -> Asia/Tokyo 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 -> Asia/Tokyo, country anchors, city anchors, calendar notes, and day-shift examples.
IST and JST are not currently a same-offset pair; the live delta is +3h 30m. Same-offset neighbors are still listed because users often confuse nearby abbreviations.
GMT+9 (To side, +09:00), KST (To side, +09:00), PWT (To side, +09:00), WIT (To side, +09:00), YAKT (To side, +09:00) The page keeps these labels visible so SGT/HKT/GST-style clusters do not blur into one generic offset page.
IST/JST uses 11 same-day answers, 1 next-day answers, 0 previous-day answers; 4.5h strict workday overlap; source zones Asia/Kolkata and Asia/Tokyo; country anchors India, Israel, and Sri Lanka -> Japan.
Common places, calendars, markets, languages, and operating contexts behindIST and JST.
JST
JST is Japan civil time, centered on Tokyo, Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, and the rest of the Japanese domestic timetable. The useful context is Japan's no-DST posture, yen-denominated business cycles, Tokyo Stock Exchange timing, rail and aviation punctuality, anime/game/media release schedules, and holiday clusters such as Golden Week and year-end closures.
JST
A JST conversion is often searched by teams coordinating with Japan specifically, not merely UTC+9. Product launches, live streams, travel arrivals, and support handoffs should account for Japanese business etiquette, local public holidays, and the difference between Japan's stable clock and regions where daylight saving changes the counterpart offset.
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.
JST
1,296 mapped city anchors; zones Asia/Tokyo.capital Tokyo; Japanese; JPY Japanese yen
Holiday snapshot: New Year's Day (Jan 1, Public) · Coming of Age Day (Jan 12, Public) · Foundation Day (Feb 11, Public) · The Emperor's Birthday (Feb 23, Public) · Vernal Equinox Day (Mar 20, 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.
JST and GMT+9 match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
JST and KST match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
JST and PWT match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
JST and WIT match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
JST and YAKT match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.
JST 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.
Abbreviations with the same UTC offset can still represent different countries, cities, currencies, languages, and civil-time histories. This roster keeps theIST to JST 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.
JST: Japan (JP); 1296 mapped cities; zones Asia/Tokyo; city anchors Tokyo (Asia/Tokyo, pop 9,733,276), Yokohama (Asia/Tokyo, pop 3,777,491), Osaka (Asia/Tokyo, pop 2,753,862), Nagoya (Asia/Tokyo, pop 2,332,176); official Japan; capital Tokyo; region Asia; subregion Eastern Asia; population 123,210,000; area 377,930 km2; languages Japanese; currency JPY Japanese yen.
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 JST.
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.
JST (jst) is not marked ambiguous in the abbreviation catalog. Meaning records: Japan Time at UTC+09:00; listed zones Asia/Tokyo; source label Japan Time - Tokyo, Yokohama, Osaka, Nagoya.
JST currently maps to 1 country footprint in the converter dataset: Japan (JP). The footprint spans 1 IANA zone across 10 city anchors.
JST city anchors in this indexed page family: Tokyo [tokyo-JP, JP, Asia/Tokyo, pop 9,733,276]; Yokohama [yokohama-JP, JP, Asia/Tokyo, pop 3,777,491]; Osaka [osaka-JP, JP, Asia/Tokyo, pop 2,753,862]; Nagoya [nagoya-JP, JP, Asia/Tokyo, pop 2,332,176]; Sapporo [sapporo-JP, JP, Asia/Tokyo, pop 1,973,832]; Fukuoka [fukuoka-JP, JP, Asia/Tokyo, pop 1,612,392]; Kawasaki [kawasaki-JP, JP, Asia/Tokyo, pop 1,538,262]; Kobe [kobe-JP, JP, Asia/Tokyo, pop 1,525,152]; Kyoto [kyoto-JP, JP, Asia/Tokyo, pop 1,463,723]; Saitama [saitama-JP, JP, Asia/Tokyo, pop 1,324,854].
JST: Japan (JP); 1296 mapped cities; zones Asia/Tokyo; city anchors Tokyo (Asia/Tokyo, pop 9,733,276), Yokohama (Asia/Tokyo, pop 3,777,491), Osaka (Asia/Tokyo, pop 2,753,862), Nagoya (Asia/Tokyo, pop 2,332,176); official Japan; capital Tokyo; region Asia; subregion Eastern Asia; population 123,210,000; area 377,930 km2; languages Japanese; currency JPY Japanese yen.
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.
JST is an Asian civil-time label, currently 9h ahead of UTC at +09:00. The lead reference is Tokyo, and the wider grouping reaches 1 country through 1 IANA zone. The busiest cities using JST in the current catalog are Tokyo, Yokohama, Osaka, Nagoya, and Sapporo. The lead live reference on this page is Tokyo (Asia/Tokyo), currently at +09:00 (GMT+9). Those cities are what give JST its actual feel rather than the abstract offset. JST is stable on Asia/Tokyo year-round, with no seasonal clock changes in the next year. That makes it a low-friction choice for recurring meetings and broadcast schedules — but software still prefers the IANA zone because governments can change civil-time rules independently of the short code.
JST resolves cleanly here, but Asian labels often share letters with American or European ones — IST is shared between India and Israel, for instance. Pinning Asia/Tokyo avoids that whole class of confusion. Asia/Tokyo does not show an offset change in the next year, which makes JST 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 JST is the exact IANA zone used by your city or system. Asia/Tokyo sits at +09:00, 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.
JST should not be blindly swapped with nearby labels. Adjacent references in the catalog: GMT+9 (+09:00, Currently sits on the same UTC offset); KST (+09:00, Currently sits on the same UTC offset); PWT (+09:00, Currently sits on the same UTC offset); WIT (+09:00, Currently sits on the same UTC offset); YAKT (+09:00, Currently sits on the same UTC offset); ACWST (+08:45, Runs on a nearby UTC offset).
JST has 1 meaning record, offset range UTC+09:00, labels Japan Time, and 1 country footprint across 1 IANA zone.
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 since 2023; 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; and 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.
JST country anchor Japan: Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asian mainland, it is bordered to the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea in the south. The Japanese archipelago consists of four major islands alongside 14,121 smaller islands. Japan is divided into 47 administrative prefectures and eight traditional regions, and around 75% of its terrain is mountainous and heavily forested, concentrating its agriculture and highly urbanized population along its eastern coastal plains. With a population of almost 123 million as of 2026, it is the world's 11th most populous country. Tokyo is the country's capital and largest city. Source: Wikipedia.
JST is Japan civil time, centered on Tokyo, Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, and the rest of the Japanese domestic timetable. The useful context is Japan's no-DST posture, yen-denominated business cycles, Tokyo Stock Exchange timing, rail and aviation punctuality, anime/game/media release schedules, and holiday clusters such as Golden Week and year-end closures.
A JST conversion is often searched by teams coordinating with Japan specifically, not merely UTC+9. Product launches, live streams, travel arrivals, and support handoffs should account for Japanese business etiquette, local public holidays, and the difference between Japan's stable clock and regions where daylight saving changes the counterpart offset.
IST/JST uses Asia/Kolkata -> Asia/Tokyo, offset delta +3h 30m, overlap 4.5h, route /convert/ist/jst/, and live abbreviation readings GMT+5:30/GMT+9.
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.
JST coverage is led by Tokyo, Japan, Yokohama, Japan, Osaka, Japan, and Nagoya, Japan, with 2 more anchoring the wider label family. Combined with the IST side, this conversion ends up describing intra-Asia regional logistics and travel coordination.
Adjust the time. Digits roll like an odometer, and the swap button flips the zones.
Same day in both places.
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| IST | JST | Day relation |
|---|---|---|
| 9:00 AM | 12:30 PMThu, Nov 5 | same day |
| 12:00 PM | 3:30 PMThu, Nov 5 | same day |
| 3:00 PM | 6:30 PMThu, Nov 5 | same day |
| 6:00 PM | 9:30 PMThu, Nov 5 | same day |
| 9:00 PM | 12:30 AMFri, Nov 6 | next day |
Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.
| JST | IST | Day relation |
|---|---|---|
| 9:00 AM | 5:30 AMThu, Nov 5 | same day |
| 12:00 PM | 8:30 AMThu, Nov 5 | same day |
| 3:00 PM | 11:30 AMThu, Nov 5 | same day |
| 6:00 PM | 2:30 PMThu, Nov 5 | same day |
| 9:00 PM | 5:30 PMThu, Nov 5 | same day |
IST to JST ranges from IST 9:00 AM (which lands at JST 12:30 PM) through IST 9:00 PM (JST 12:30 AM). Across this +3h 30m gap, the middle of the IST range usually lands in the JST afternoon — the reliable window for live calls between the two — while the early and late edges drift into JST morning or evening.
JST to IST ranges from JST 9:00 AM (which lands at IST 5:30 AM) through JST 9:00 PM (IST 5:30 PM). Across this +3h 30m gap, the middle of the JST 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 JST” or “4 PM IST in JST”.
8 AM IST = 11:30 AM JST (11:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
9 AM IST = 12:30 PM JST (12:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
10 AM IST = 1:30 PM JST (13:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
11 AM IST = 2:30 PM JST (14:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
12 PM IST = 3:30 PM JST (15:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
1 PM IST = 4:30 PM JST (16:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
2 PM IST = 5:30 PM JST (17:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
3 PM IST = 6:30 PM JST (18:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
4 PM IST = 7:30 PM JST (19:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
5 PM IST = 8:30 PM JST (20:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
6 PM IST = 9:30 PM JST (21:30). On today's live calendar that lands on Thu, Nov 5 in JST, which means the answer is a same day conversion rather than a static offset lookup.
9 PM IST = 12:30 AM JST (00:30). On today's live calendar that lands on Fri, Nov 6 in JST, which means the answer is a next day conversion rather than a static offset lookup.
The live gap is +3h 30m right now, based on Asia/Kolkata at +05:30 and Asia/Tokyo at +09:00. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
The most usable workday block right now is about 4.5 hours: IST 9:00 AM previous day to 1:30 PM previous day, which lines up with JST 12:30 PM previous day to 5:00 PM previous day.
Asia/Kolkata
GMT+5:30 · +05:30
Asia/Tokyo
GMT+9 · +09:00
These are the busiest live references selected from the abbreviation families on this page.
| IST | JST |
|---|---|
| 05:30 | 09:00 |
| 06:30 | 10:00 |
| 07:30 | 11:00 |
| 08:30 | 12:00 |
| 09:30 | 13:00 |
| 10:30 | 14:00 |
| 11:30 | 15:00 |
| 12:30 | 16:00 |
| 13:30 | 17:00 |
| 14:30 | 18:00 |
| 15:30 | 19:00 |
| 16:30 | 20:00 |
| 17:30 | 21:00 |
| 18:30 | 22:00 |
| 19:30 | 23:00 |
| 20:30 | 00:00 |
| 21:30 | 01:00 |
| 22:30 | 02:00 |
| 23:30 | 03:00 |
| 00:30 | 04:00 |
| 01:30 | 05:00 |
| 02:30 | 06:00 |
| 03:30 | 07:00 |
| 04:30 | 08:00 |
Countries represented here include India, Israel, and Sri Lanka.
Countries represented here include Japan.
Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.
Interactive converter
Move from this static pair into the full timezone converter with more cities and abbreviations.
Compare city pairs
Use compare pages when the practical question is overlap, not just offset arithmetic.
World clock
Open live city clocks after narrowing the timezone pair you care about.
Browse city pages
Jump into the strongest city pages when you want location-specific timezone context.
