Skip to content

IST to JST Time Converter

Type a time in IST to see it in JST, with daylight saving handled for the date you pick. Every hour of the day is in the table below, and the meeting planner shows when both working days overlap.

v2026.10.10

In Tokyo

12:30 pmJST

9:00 am IST on Wed 14 Jan 2026 is 12:30 pm JST the same day. Tokyo is 3 h 30 min ahead of India.

India (IST)0 · 6 · 12 · 18
Tokyo (JST)
9 am–5 pmBoth at work: 4.5 h
Date there
Wednesday 14 January 2026
Offsets
IST UTC+5:30 · JST UTC+9
Date used
Example day: Wednesday 14 January 2026
How this works: Method, 3 sources,

How this works

Method

Here IST means India Standard Time, UTC+5:30 all year; JST means Japan Standard Time, UTC+9 all year. So JST is 3 h 30 min ahead of IST all year. Two 9-to-5 working days overlap by 4 h 30 min all year. Full method

Sources

Changes

  • 15 more conversion pages (IST to CST, BST to IST, SGT, GST, JST, MST and more); each conversion page shows all 24 hours with working hours shaded, and its best meeting times.
  • The pickers find about a thousand more cities, states and countries (Seattle, Bangalore, Texas), and each conversion page names the next clock change on either side.
  • The converter opens on the time now, live, with a Now choice beside the time, and the main converter starts from your own time zone.
  • First published, with a world clock, pages for the time in 31 places and 15 common conversions such as PST to IST.

Every change on What’s new

How we make toolsReport a mistake

How to convert IST to JST

Here IST means India Standard Time, UTC+5:30 all year; JST means Japan Standard Time, UTC+9 all year. So JST is 3 h 30 min ahead of IST all year. Two 9-to-5 working days overlap by 4 h 30 min all year.

From India, IST to JST helps engineers supporting Japanese clients, students preparing for Japanese language exams or universities, and anyone joining a Tokyo meeting. Japan’s working day starts at 5:30 am Indian time and ends at 1:30 pm, so the shared office hours are the Indian morning, from 9:00 am to about 1:30 pm.

There is no daylight saving on either side, so add 3 h 30 min on any date. A Tokyo meeting at the top of the hour is always at half past in India, so set the calendar entry in Japan time if you can and let your calendar show it in yours. Late Indian evenings are already past midnight in Tokyo: 9:00 pm in India is 12:30 am the next day there.

Rule of thumb: Add 3½ hours to Indian time: 10:00 am IST is 1:30 pm in Tokyo, and 9:00 pm IST is 12:30 am the next day.

JST = IST +3:30

  • Japan’s standard time has been UTC+9 since 1 January 1888, according to the Asia/Tokyo zone in the tz database. Source: IANA tz database, file asia.

Meeting planner: best times for IST and JST

The easiest meetings fall where both working days overlap, shaded dark on the bar. The lighter shading is still between 7 am and 9 pm on both clocks, so one side starts early or stays late.

All year: IST and JST

  • Both at work: 9:00 am to 1:30 pm IST is 12:30 pm to 5:00 pm JST (4 h 30 min).
  • Early or late for one side: 7:00 am to 9:00 am IST is 10:30 am to 12:30 pm JST (2 h); 1:30 pm to 5:30 pm IST is 5:00 pm to 9:00 pm JST (4 h).

Both between 9 am and 5 pmBoth between 7 am and 9 pm

IST to JST time conversion table

Every hour of the IST day and the time in JST. The difference is the same all year.

Every hour of the IST day and the time in JST. The difference is the same all year.
IST timeJST time
12:00 am3:30 am
1:00 am4:30 am
2:00 am5:30 am
3:00 am6:30 am
4:00 am7:30 am
5:00 am8:30 am
6:00 am9:30 am
7:00 am10:30 am
8:00 am11:30 am
9:00 am12:30 pm
10:00 am1:30 pm
11:00 am2:30 pm
12:00 pm3:30 pm
1:00 pm4:30 pm
2:00 pm5:30 pm
3:00 pm6:30 pm
4:00 pm7:30 pm
5:00 pm8:30 pm
6:00 pm9:30 pm
7:00 pm10:30 pm
8:00 pm11:30 pm
9:00 pm12:30 am (next day)
10:00 pm1:30 am (next day)
11:00 pm2:30 am (next day)

Shaded: 9 am to 5 pm on that clock. Where a row is shaded on both sides, both are at work.

Frequently Asked Questions

What is 9 am IST in JST?

9:00 am IST is 12:30 pm JST, all year round.

What is 9 pm IST in Japan?

9:00 pm in India is 12:30 am the next day in Japan, all year.

Is Korea on the same time as Japan?

Yes. South Korea and Japan both use UTC+9 without daylight saving time, so both are 3 h 30 min ahead of India.