Japan Standard Time to Coordinated Universal Time, with the offset for today's date rather than an average.
UTC time
Coordinated Universal Time is behind Japan Standard Time — noon in JST is 3:00 am in UTC
JST todayUTC+09:00
UTC todayUTC+00:00
Working-hour overlap0 h
Common meeting hours converted from JST to UTC
JST (Japan Standard Time)
UTC (Coordinated Universal Time)
Working hours in both?
7:00 am
10:00 pm previous day
No
8:00 am
11:00 pm previous day
No
9:00 am
12:00 am
No
10:00 am
1:00 am
No
11:00 am
2:00 am
No
12:00 pm
3:00 am
No
1:00 pm
4:00 am
No
2:00 pm
5:00 am
No
3:00 pm
6:00 am
No
4:00 pm
7:00 am
No
5:00 pm
8:00 am
No
6:00 pm
9:00 am
No
7:00 pm
10:00 am
No
8:00 pm
11:00 am
No
This calculator needs JavaScript to recalculate. The answer above was
worked out on 19 August 2026 and is correct for
that date; the site rebuilds every morning.
Rebuilt
· conventions last checked
Which zone this page means. Japan does not observe daylight saving, so JST applies all year. UTC never observes daylight saving. It is the reference all other offsets are given against.
JST is ahead of UTC by 9 hours today
On 19 August 2026, Japan Standard Time is on JST at
UTC+09:00 and Coordinated Universal Time is on UTC at
UTC+00:00. The gap between them is
9 hours, with UTC
behind. So 9:00 am in JST is
12:00 am in UTC, and 5:00 pm in JST is
8:00 am in UTC. Going the other way, see UTC to JST.
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
are 0 overlapping hours
in a normal day. There is none: the two working days do not touch at all, so any live meeting between
Japan Standard Time and Coordinated Universal Time has to sit outside somebody's normal hours. The table above shows
which end has the shorter stretch to give up.
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.
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 9-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 JST the same as Japan 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 JST and UTC?
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.