The short answer
4am in Japan Standard Time is 7pm in Coordinated Universal Time on the previous day.
Japan Standard Time is 9 hours ahead of Coordinated Universal Time. That's already evening in Coordinated Universal Time, after the typical working day ends.
Japan Standard Time☾
4am
Coordinated Universal Time☾
7pm
previous day
Right now
5:59pmJST · UTC+09:00 · Mon, Jun 22
8:59amUTC · UTC+00:00 · Mon, Jun 22
Read across to convert
Japan Standard Time
JST · UTC+09:00
Coordinated Universal Time
UTC · UTC+00:00
Pinned4amJapan Standard Time=7pmCoordinated Universal Time · Sun (previous day)
12amMon
3pmSun ·−1d
WORK1am
4pmSun ·−1d
WORK2am
5pmSun ·−1d
3am
6pmSun ·−1d
PINNED
4am
7pmSun ·−1d
5am
8pmSun ·−1d
6am
9pmSun ·−1d
7am
10pmSun ·−1d
8am
11pmSun ·−1d
9am
WORK12amMon
10am
WORK1am
11am
WORK2am
12pm
WORK3am
1pm
WORK4am
2pm
WORK5am
3pm
WORK6am
4pm
WORK7am
NOW
5pm
8am
6pm
9am
WORK7pm
10am
WORK8pm
11am
WORK9pm
12pm
WORK10pm
1pm
WORK11pm
2pm
WORKdaylightnightworking hoursoverlap
Best time to meet=
Closest workable window
Just outside the working window — early on one side, late on the other.
Japan Standard Time
4pm–7pm
Coordinated Universal Time
7am–10am
Popular conversions
Quick reference.
9amJapan Standard Time=12amCoordinated Universal Time
12pmJapan Standard Time=3amCoordinated Universal Time
3pmJapan Standard Time=6amCoordinated Universal Time
5pmJapan Standard Time=8amCoordinated Universal Time
9pmJapan Standard Time=12pmCoordinated Universal Time
In context
What each side covers.
Japan Standard Time
5:59pmJST · UTC+09:00
Coordinated Universal Time
8:59amUTC · UTC+00:00
Coordinated Universal Time
Related converters
Other popular pairs.
Pacific Time
1:59am
India Standard Time
2:29pm
Pacific Time to India12 hours 30 minutes behind
Eastern Standard Time
4:59am
Central European Time
10:59am
Eastern Time to Central Europe6 hours behind
India Standard Time
2:29pm
Eastern Standard Time
4:59am
India to Eastern Time9 hours 30 minutes ahead
Greenwich Mean Time
9:59am
India Standard Time
2:29pm
London to India4 hours 30 minutes behind
Pacific Standard Time
1:59am
Eastern Standard Time
4:59am
Pacific to Eastern Time3 hours behind
Central European Time
10:59am
India Standard Time
2:29pm
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Japan Standard Time and Coordinated Universal Time. Can't find what you need? Email [email protected].
- What is the time difference between Japan Standard Time and Coordinated Universal Time?
- Japan Standard Time is 9 hours ahead of Coordinated Universal Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.
- When it's 4am in Japan Standard Time, what time is it in Coordinated Universal Time?
- 4am in Japan Standard Time is 7pm in Coordinated Universal Time on the previous day. That's already evening in Coordinated Universal Time, after the typical working day ends. Use the hour-by-hour table above to read any other time across.
- What's the best time for a call between Japan Standard Time and Coordinated Universal Time?
- There's no comfortable 9-to-5 overlap between Japan Standard Time and Coordinated Universal Time — they sit on opposite sides of the planet's working day. Plan for an early or late call on one side, or hand work off asynchronously.
- Does this account for daylight saving time?
- Yes. We track every clock change in both places, so the abbreviations you see — JST and UTC — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.
- Why is the date sometimes different on each side?
- When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.