Compare IST vs JST
See the current IST to JST time difference, check shared working hours, and schedule calls between India and Japan.
IST and JST Offset
IST is India Standard Time at UTC+5:30, while JST is Japan Standard Time at UTC+9. JST is 3 hours 30 minutes ahead of IST year-round.
No DST Changes
Neither IST nor JST currently observes daylight saving time, so the time difference stays consistent. Historical timezone changes are tracked using the IANA timezone database.
Best Meeting Hours
Use the hour-by-hour comparison grid to find overlapping business hours between India and Japan. Export selected times with ICS download or add them to Google Calendar and Gmail.
How to Find the Time Difference Between IST and JST
Open the IST vs JST converter: Go to https://www.xconvert.com/time-converter/ist-vs-jst to load a visual comparison grid with IST and JST already set up as rows. This is useful when you are scheduling a call between an India-based operations team and colleagues in Japan, such as coordinating software releases, electronics supply chain updates, or customer support coverage across Asia.
Add comparison cities if your workflow spans more than two markets: Click + Add City and search for cities that matter to your schedule, such as Mumbai, Tokyo, or Dublin, depending on whether you are working with India, Japan, or another region that uses IST as an abbreviation. This is especially practical for companies handling cross-border manufacturing, IT services, or trading relationships where one team works in India time and another works on Japan time.
Select a working window on the grid: Click Select to enter selection mode, then drag across the colored hourly slots on the IST row to highlight a meeting range in purple; you can resize it with the side handles or move it by dragging the center. For example, if you drag a slot starting at 9:00 IST, the JST row shows 13:00 JST, and if you choose 15:00 IST, the matching time is 19:00 JST, making it easy to see that Japan is 4 hours ahead when planning afternoon handoffs or vendor calls.
Export and share the chosen time: Once the range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is helpful when a procurement team in India needs to send a confirmed meeting window to a partner in Japan so everyone receives the appointment in their own local calendar without manually converting the time.
IST vs JST Offset Explained
IST is UTC+5 and JST is UTC+9, so JST is 4 hours ahead of IST. In practical terms, when it is 9:00 IST, it is 13:00 JST, and when it is 18:00 IST, it is 22:00 JST. This gap matters for same-day coordination because a late afternoon task in India lands in the evening in Japan.
The abbreviation IST can refer to multiple time standards, including usage in India, Ireland, and Israel, so context matters when you see “IST” on a calendar invite or email thread. On this comparison page, the offset relationship is shown directly against JST so you can avoid confusion when arranging meetings, support shifts, or delivery deadlines involving India and Japan.
Seasonal changes are important when interpreting IST because IST is a standard-time abbreviation and its DST counterpart is IDT. By contrast, JST does not observe DST, which means Japan stays on the same time standard year-round; if you are working with a region where IST may shift seasonally, it is important to confirm which local meaning of IST is being used before locking in a recurring meeting.
This 4-hour lead makes some meeting windows more practical than others. A 12:00 IST meeting becomes 16:00 JST, which fits well for afternoon collaboration, while 15:00 IST = 19:00 JST is better suited to urgent updates than routine team meetings. For remote teams in software, automotive supply chains, semiconductor procurement, and regional sales, this difference often pushes the best overlap into India’s late morning or early afternoon.
Working Hours and Scheduling Between India Time and Japan Time
For business coordination, the cleanest overlap usually comes earlier in the Indian workday because Japan runs 4 hours ahead. A meeting at 9:00 IST = 13:00 JST works well for post-lunch discussions in Japan, while 12:00 IST = 16:00 JST is often a strong option for project reviews, account management calls, and logistics planning before Japanese offices close.
Later India meetings can become less convenient for Japan-based participants. For example, 18:00 IST = 22:00 JST, which is already late evening in Japan and typically unsuitable for routine internal meetings, though it may still be used for urgent production issues, release coordination, or travel disruptions. Teams in IT services, electronics manufacturing, shipping, and regional procurement often use this kind of comparison to avoid scheduling into Japan’s night hours.
Common Use Cases for IST and JST Conversion
IST and JST comparisons are frequently used by companies managing operations between India and Japan. Indian software and back-office teams may support Japanese clients during overlapping daytime hours, while manufacturers and sourcing teams use the conversion to align factory updates, shipment approvals, and quality-control discussions.
The time gap also matters for travelers and flight planning. If you are leaving India and coordinating arrival-side pickup, hotel check-in, or airport transfer support in Japan, knowing that JST is 4 hours ahead helps you interpret messages and reservation times correctly. It is equally useful for webinars, virtual interviews, and training sessions where participants in both countries need a clear same-day schedule.
Frequently Asked Questions
What is the time difference between IST and JST?
JST is 4 hours ahead of IST. That means a time like 9:00 IST becomes 13:00 JST, and 15:00 IST becomes 19:00 JST, which is important when planning calls that need to stay within normal business hours in both regions.
Is Japan ahead of India in time?
Yes, Japan Standard Time is ahead of India Standard Time by 4 hours. In day-to-day scheduling, this means Japan reaches the afternoon and evening sooner, so a meeting set late in India can quickly become an after-hours appointment in Japan.
How do I convert IST to JST quickly?
Use the visual grid on the converter page and compare the highlighted range across both rows. If you select 12:00 IST, you will see 16:00 JST, and if you move the selection to 18:00 IST, the corresponding time is 22:00 JST, which makes it easy to test whether a proposed meeting is realistic for both teams.
Does JST observe daylight saving time?
No, JST does not observe DST. Japan stays on the same time standard throughout the year, which makes recurring scheduling more predictable for companies arranging ongoing meetings with Japanese offices, suppliers, or clients.
Does IST observe daylight saving time?
IST is a standard-time abbreviation, and its DST counterpart is IDT. Because the abbreviation IST can be used in different countries, it is important to confirm which local time standard is meant before sending recurring calendar invitations or publishing event times.
What countries use IST and JST?
IST is used in India, Ireland, and Israel, while JST is used in Japan. This matters because the same three-letter abbreviation can mean different local time systems, so international teams should always confirm the region attached to “IST” when comparing it with Japan time.
What is 9 AM IST in Japan time?
9:00 IST = 13:00 JST. This is a practical meeting slot for India-Japan coordination because it lands in early afternoon in Japan, making it suitable for project check-ins, client calls, and operational updates.
What is 6 PM IST in Japan time?
18:00 IST = 22:00 JST. That is late evening in Japan, so it is usually better reserved for urgent matters rather than routine weekly meetings, especially for teams that need consistent attendance from both sides.