IST vs JST Time Difference
See the current time gap between India Standard Time and Japan Standard Time, check overlap hours, and plan meetings quickly.
Current Time Difference
India Standard Time is UTC+5:30 and Japan Standard Time is UTC+9, so JST is 3 hours 30 minutes ahead of IST year-round.
No DST Changes
Neither India Standard Time nor Japan Standard Time currently observes daylight saving time, so the IST–JST difference stays consistent.
Best Meeting Hours
Find the most practical overlap for India and Japan with hour-by-hour comparison tools, then export plans to calendar files or Google Calendar.
How to Find the Time Difference Between IST and JST
IST (India Standard Time, UTC+5:30) and JST (Japan Standard Time, UTC+9) are 3 hours 30 minutes apart, with JST 3 hours 30 minutes ahead of IST. This comparison is useful when you are scheduling a supplier call between India and Japan, planning travel connections through Tokyo, or coordinating engineering, automotive, electronics, and IT teams across both countries.
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 IST vs JST page: Go to
https://www.xconvert.com/time-converter/ist-vs-jstto open the comparison grid with India Standard Time and Japan Standard Time ready for side-by-side viewing. This is the fastest way to evaluate meeting windows if you work with software teams in India and business partners in Japan, or if you need to compare office hours before booking a cross-border call.Add comparison cities: Click + Add City and search for cities that matter to your schedule, such as Tokyo for Japanese headquarters, New Delhi for India-based operations, or Mumbai for finance, outsourcing, and technology coordination. Adding multiple rows helps when a company has product teams in India and client-facing, manufacturing, or procurement teams working on Japan time.
Select a time range on the grid: Click Select if needed, then drag across the colored timeline on the India Standard Time row to highlight a meeting block in purple; you can move it by dragging the center or adjust it with the left and right handles. For example, dragging from 9:00 IST to 12:00 IST shows the matching Japan Standard Time window of 12:30 JST to 15:30 JST, which is useful for planning midday collaboration between Indian development teams and Japanese stakeholders.
Export and share the result: Once the purple range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially practical when you need to send a confirmed meeting slot to a distributed team, attach it to a client email, or place a recurring India-Japan handoff into everyone’s local calendar without confusion.
IST vs JST Offset Explained
India Standard Time uses UTC+5:30, while Japan Standard Time uses UTC+9. That means JST is 3 hours 30 minutes ahead of IST, or viewed the other way, IST is 3 hours 30 minutes behind JST. In practical scheduling terms, when it is 9:00 IST, it is 12:30 JST; when it is 15:00 IST, it is 18:30 JST.
India Standard Time is used in India, and Japan Standard Time is used in Japan. This makes the comparison especially relevant for companies handling software development, semiconductor supply chains, automotive manufacturing, electronics sourcing, gaming, and regional business operations between the two countries. A workday that starts in India reaches Japan’s afternoon quickly, so morning meetings in India often align best with post-lunch or late-afternoon discussions in Japan.
Neither time zone observes daylight saving time. India Standard Time does not observe DST, and Japan Standard Time does not observe DST, so the 3 hours 30 minutes difference stays the same throughout the year. That consistency is useful for recurring standups, vendor reviews, support coverage, and travel planning because the relationship between the two clocks does not shift seasonally.
A few anchor conversions make the relationship easy to remember. 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 Indian business hours overlap well with Japan’s afternoon and evening, which is often suitable for project updates, procurement calls, and end-of-day status reviews.
Best Times for India-Japan Scheduling
India Standard Time and Japan Standard Time have a manageable gap for same-day collaboration because the difference is only 3 hours 30 minutes. A morning work block in India maps directly into midday or afternoon in Japan, which often works well for product teams, consulting firms, logistics coordinators, and customer success staff who need live communication without forcing either side into overnight hours.
The most practical use of the IST-JST comparison is finding overlap inside normal office hours. For example, 12:00 IST = 15:30 JST, which is a strong slot for formal meetings, progress reviews, and partner updates because both sides are still within the standard business day. Later Indian meetings can still work, but 18:00 IST = 21:30 JST already pushes Japanese participants into late evening, which is better reserved for urgent coordination rather than routine calls.
This time relationship is also helpful for travel and operations planning. If a team in India needs to speak with contacts in Japan before the Japanese business day ends, using the grid to test a block around 15:00 IST = 18:30 JST can quickly show whether the call fits finance, legal, procurement, or technical review schedules. Because there is no DST change in either country, recurring weekly meetings remain stable on the calendar all year.
Frequently Asked Questions
What is the time difference between India Standard Time and Japan Standard Time?
India Standard Time is UTC+5:30 and Japan Standard Time is UTC+9. JST is 3 hours 30 minutes ahead of IST, so a time in India always appears 3 hours 30 minutes later in Japan. For example, 9:00 IST = 12:30 JST.
Is JST ahead of IST or behind it?
Japan Standard Time is ahead of India Standard Time. The exact difference is 3 hours 30 minutes, so if a team in India starts work at 9:00 IST, contacts in Japan are already at 12:30 JST, well into the business day.
Does the IST to JST time difference change during the year?
No, the difference stays constant all year. India Standard Time does not observe DST and Japan Standard Time does not observe DST, so the gap remains 3 hours 30 minutes in every month. That makes recurring meetings easier to manage because there are no seasonal clock changes to adjust for.
What time is 9 AM IST in Japan?
9:00 IST = 12:30 JST. This is a useful conversion for companies in India that want to reach Japanese teams around lunchtime or early afternoon, especially for project check-ins, vendor communication, or regional operations calls.
What time is noon in India Standard Time in Japan Standard Time?
12:00 IST = 15:30 JST. This is often one of the most practical meeting windows because it lands in the middle of the afternoon in Japan, giving both sides enough working time before and after the meeting for follow-up tasks.
What time is 3 PM IST in JST?
15:00 IST = 18:30 JST. That can still work for same-day discussions, especially for urgent approvals or end-of-day coordination, but it is already moving into early evening in Japan, so it may be less suitable for routine recurring meetings.
What time is 6 PM IST in Japan?
18:00 IST = 21:30 JST. This is a late-evening time in Japan, so it is usually better for exceptional cases such as deadline-driven coordination, production issues, or travel-related communication rather than standard business meetings.
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 Israel Standard Time (UTC+2), use /time-converter/ist-israel-time-zone.