India Standard Time to Japan Standard Time, with the offset for today's date rather than an average.
JST time
Japan Standard Time is ahead of India Standard Time — noon in IST is 3:00 pm in JST
IST todayUTC+05:30
JST todayUTC+09:00
Working-hour overlap5 h
Common meeting hours converted from IST to JST
IST (India Standard Time)
JST (Japan Standard Time)
Working hours in both?
7:00 am
10:00 am
No
8:00 am
11:00 am
No
9:00 am
12:00 pm
Yes
10:00 am
1:00 pm
Yes
11:00 am
2:00 pm
Yes
12:00 pm
3:00 pm
Yes
1:00 pm
4:00 pm
Yes
2:00 pm
5:00 pm
No
3:00 pm
6:00 pm
No
4:00 pm
7:00 pm
No
5:00 pm
8:00 pm
No
6:00 pm
9:00 pm
No
7:00 pm
10:00 pm
No
8:00 pm
11:00 pm
No
This calculator needs JavaScript to recalculate. Without it you are
reading the answer worked out on 28 August 2026, which is exact for that date and does not
change by itself. With JavaScript on, the page works the answer out again for the date you
open it.
Worked out for
· conventions last checked
Which zone this page means. IST means India Standard Time (UTC+5:30), Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page means the Indian zone, which is one of the few on a half-hour offset. Japan does not observe daylight saving, so JST applies all year.
IST is behind JST by 3.5 hours today
On 28 August 2026, India Standard Time is on IST at
UTC+05:30 and Japan Standard Time is on JST at
UTC+09:00. The gap between them is 3.5 hours, with JST ahead. So 9:00 am in IST is
12:00 pm in JST, and 5:00 pm in IST is
8:00 pm in JST. Going the other way, see JST to IST.
The gap is not constant, and that is the part that catches people out
Neither zone observes daylight saving, so this is one of the few pairs where the offset really is
constant all year. That is unusual: most gaps between named zones move by an hour twice a year, and
by two hours during the weeks when the two ends change on different dates.
When you can actually both be at work
Taking a working day as 9:00 am to 5:00 pm local at each end, there
are5 overlapping hours
in a normal day. In IST that window runs from 9:00 am to 2:00 pm, which is 12:00 pm to 5:00 pm in JST. Anything outside it needs one side to start early or finish late.
Zone rules are set by legislation and change, sometimes at short notice. This page is
built against tzdata 2026a, last reviewed
2026-08-18. Quarterly. Zone rules change by legislation, sometimes at short notice. Version and review date are shown on every zone page. The converter above reads
your browser's own copy of the zone database, so if a rule has changed since this page was built the
live answer follows the new rule — and so does everything above, which is worked out from the same
database when you open the page.
Every convention used above — whether the start date counts, how month ends are
clamped, which holidays close an office — is written out on the
methodology page, including the daylight-saving rules behind the 3.5-hour gap above.
The current offset is shown at the top of this page. It is computed for today's date rather than quoted as an average, because the two regions change their clocks on different dates and the gap is different for a few weeks each year.
Is IST the same as India Standard Time all year?
Not necessarily. Standard time and summer time are separate zones with separate abbreviations, so much of the year the technically correct abbreviation is the daylight one. The page states which is in force on today's date.
When do the clocks change in these zones?
The next change date for each zone is shown in the result panel, along with what the offset becomes afterwards.
What is a good meeting time between IST and JST?
The business-hours overlap window is shown below the converter. Where there is no overlap the page says so rather than suggesting an impossible time.
This page could not bring itself up to date in your
browser, so the dates above are the ones worked out on 28 August 2026. They are exact for
that date and do not change by themselves. Enter your own dates in the calculator above for an
answer worked out now.