Convert IST to JST
See the time difference between India Standard Time and Japan Standard Time, view matching hours, and plan calls or meetings quickly.
How IST Converts to JST
India Standard Time is UTC+5:30 and Japan Standard Time is UTC+9, so JST is 3 hours 30 minutes ahead of IST. This converter updates the matching time instantly for both zones.
Hour-by-Hour Time Table
Use the visual hour-by-hour table to compare IST and JST across the day. Scan overlapping business hours, then export selected times with ICS download or Google Calendar and Gmail links.
Schedule Meetings with Confidence
Find practical meeting times between India and Japan with automatic timezone adjustment and DST tracking. Accuracy is based on the IANA timezone database, including historical rule changes.
How to Convert IST to JST
IST (India Standard Time, UTC+5:30) to JST (Japan Standard Time, UTC+9) is a common conversion for teams coordinating work between India and Japan. If you are planning a supplier call with a manufacturing partner in Japan or scheduling a product handoff between an engineering team in India and stakeholders in Tokyo, this page gives you a visual way to compare both time zones.
Looking for Irish Standard Time? See /time-converter/ist-ireland-time-zone.
Looking for Israel Standard Time? See /time-converter/ist-israel-time-zone.
Open the converter page: Go to
https://www.xconvert.com/time-converter/ist-to-jst-converterto load a comparison view for India Standard Time and Japan Standard Time. You will see the visual 24-hour grid with colored work, evening, and night blocks, which is useful when you need to line up business hours for India-Japan software projects, electronics sourcing, or customer support coordination.Add comparison cities if needed: Click + Add City and search for cities that matter to your schedule, such as Tokyo for Japan-focused meetings or Indian cities used by your team. This is especially helpful for companies managing cross-border work in IT services, automotive supply chains, gaming, and electronics, where India and Japan often need clearly defined overlap windows.
Select a meeting window on the grid: Click Select, then drag across the IST row to highlight a time range in purple, such as 9:00 IST to 12:00 IST. The grid will show that this corresponds to 12:30 JST to 15:30 JST, which is a practical midday-to-afternoon overlap for project reviews, vendor updates, and remote team standups; you can also drag the center to move the whole block or use the side handles to resize it.
Export and share the selected time: Once a range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. That makes it easy to send a confirmed India-Japan meeting slot to a distributed team so everyone receives the event in their own local calendar without manually rewriting the time.
Understanding the IST to JST Time Difference
India Standard Time (UTC+5:30) is 3 hours 30 minutes behind Japan Standard Time (UTC+9), and Japan Standard Time is 3 hours 30 minutes ahead of India Standard Time. In practical terms, that means a morning schedule in India shifts into midday or later in Japan, which is why India-based teams often reach Japan during the Japanese lunch and afternoon business window.
The conversion remains consistent throughout the year because India Standard Time does not observe DST and Japan Standard Time does not observe DST. Since neither time zone changes clocks seasonally, the IST-JST difference does not change in any month, making recurring meetings easier to keep stable for offshore development, procurement calls, and executive check-ins.
A few direct examples make the pattern clear: 9:00 IST = 12:30 JST, 12:00 IST = 15:30 JST, 15:00 IST = 18:30 JST, and 18:00 IST = 21:30 JST. These examples show that standard daytime work in India maps to midday, late afternoon, evening, and night in Japan, so teams usually get the best overlap earlier in the Indian workday.
Best Times for Calls and Meetings Between IST and JST
India Standard Time and Japan Standard Time are close enough for same-day collaboration, but the 3 hours 30 minutes gap still matters when you are trying to stay inside normal office hours on both sides. In most business situations, the most practical meeting slots happen during the morning to early afternoon in India Standard Time, because those hours become midday to late afternoon in Japan Standard Time.
For example, 9:00 IST = 12:30 JST and 12:00 IST = 15:30 JST, which creates a strong overlap window for status meetings, sales calls, design reviews, and supplier coordination. This is often the easiest period for India-based IT services firms, consulting teams, and operations groups working with Japanese clients or partners, because both sides are still within a normal business day.
Later meetings become harder to sustain for Japan-based participants. 15:00 IST = 18:30 JST can still work for urgent discussions or end-of-day handoffs, but 18:00 IST = 21:30 JST is already late evening in Japan, which is less suitable for recurring meetings and better reserved for exceptions, launch support, or deadline-driven coordination.
Because neither India Standard Time nor Japan Standard Time uses daylight saving time, a meeting that works now will keep the same offset all year. That consistency is valuable for recurring weekly calls, especially for remote product teams, export-import operations, and regional management meetings that need a fixed schedule without seasonal adjustments.
Frequently Asked Questions
What is the time difference between IST and JST?
India Standard Time is 3 hours 30 minutes behind Japan Standard Time, and Japan Standard Time is 3 hours 30 minutes ahead of India Standard Time. Since IST is UTC+5:30 and JST is UTC+9, the gap stays fixed and does not shift during the year.
When is 9 AM IST in JST?
9:00 IST = 12:30 JST. This is a useful conversion for teams in India starting their workday and reaching colleagues in Japan around lunchtime, which often works well for daily syncs, account updates, and operational planning.
Does the difference between IST and JST change during DST?
No, the difference does not change during daylight saving time because India Standard Time does not observe DST and Japan Standard Time does not observe DST. As a result, the IST-JST gap stays 3 hours 30 minutes in every month of the year, which simplifies recurring calendar scheduling.
What is the best meeting time between IST and JST?
The most practical meeting window is usually in the morning to early afternoon in India Standard Time, because that maps to midday to late afternoon in Japan Standard Time. For example, 9:00 IST = 12:30 JST and 12:00 IST = 15:30 JST, both of which fit comfortably into the business day for many India-Japan meetings.
When is 12 PM IST in JST?
12:00 IST = 15:30 JST. This is often a strong option for cross-border meetings because it places India at midday and Japan in the middle of the afternoon, leaving enough time afterward for follow-ups, approvals, or technical action items.
When is 3 PM IST in JST?
15:00 IST = 18:30 JST. That can still work for short calls or urgent coordination, but it is already early evening in Japan, so it is less ideal for recurring meetings than earlier India Standard Time slots.
Is IST India Standard Time or Irish Standard Time?
On this page, IST means India Standard Time (UTC+5:30). If you are looking for Irish Standard Time (UTC+1), use /time-converter/ist-ireland-time-zone; if you need the Japan comparison here, the page is specifically for India Standard Time to Japan Standard Time.