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Time calculator

Tokyo / Japan Time

Live local time in Tokyo and Japan (Asia/Tokyo). Free online tool — no sign-up. Clear formulas and worked examples. Runs locally in your browser.

Instant result
Result
—

Enter values to calculate.

Inputs—
Mode—
Formula—
Trust summary Engine tested · Specification checked · v1.0.1
Input interpretation
Enter values to calculate.
Result
—
Model
Current local date and time in the Asia/Tokyo time zone (Japan Standard Time).
Scope
Device clock and OS timezone database are reasonably correct.
Verification
Engine tested · Specification checked · v1.0.1
Named expert review
Optional · Not performed
Specification basis
  • IANA time zone database — Asia/Tokyo
  • Japan Standard Time (JST) = UTC+09:00
  • Japan: no Daylight Saving Time
Specification basis

Formulas

Core equations used by this calculator.

IANA zoneAsia/Tokyo
JST (year-round)UTC + 9 hours
iNo seasonal clock change. Same UTC+9 offset as Asia/Seoul; separate IANA zone.

How to use

1

Open the live clock

The page shows current date and time for Asia/Tokyo from your browser.

2

Refresh if needed

Use Refresh to re-read the clock; the display also updates about once per second.

3

Plan with a fixed offset

Japan stays on JST (UTC+9) all year.

Example calculations

Common configurations with formula and result.

ϟ

Noon UTC

JST = UTC+9

12:00 UTC + 9 h
21:00 JST
ϟ

vs Seoul

Both UTC+9

Difference = 0
Identical clock time
ϟ

vs Beijing

CST = UTC+8

JST − CST = 1 h
Tokyo is 1 hour ahead of Beijing
ϟ

vs London in winter

GMT = UTC+0

JST − GMT = 9 h
Tokyo is 9 hours ahead of GMT

Tokyo vs other zones

Common values at a glance.

City / zoneOffsetTokyo relative
Seoul (KST)UTC+9Same time
Beijing / Hong Kong / SingaporeUTC+81 hour ahead
Bangkok (ICT)UTC+72 hours ahead
India (IST)UTC+5:303 hours 30 min ahead
London (GMT)UTC+09 hours ahead
New York (EST)UTC−514 hours ahead
UTCUTC+09 hours ahead
i When London or New York are on daylight time, Tokyo’s lead shrinks by one hour. Tokyo’s own offset never changes.

Tokyo / Japan Time specification

Version 1.0.1 · Engine tested

Calculation status
  • Engine tested 3 published cases
  • Named expert review Not performed
  • Calculation version 1.0.1

Review policy

Definition
Tokyo and all of Japan use Japan Standard Time (JST, UTC+09:00) on the IANA zone Asia/Tokyo year-round. Japan does not observe Daylight Saving Time. The clock matches Seoul (KST).
What it calculates
Current local date and time in the Asia/Tokyo time zone (Japan Standard Time).
Inputs
  • None — uses the device clock and the IANA zone Asia/Tokyo
Outputs
  • Local time (24-hour style from the browser formatter)
  • Local calendar date
Formula
Display = Intl.DateTimeFormat with timeZone Asia/Tokyo
Assumptions
  • Device clock and OS timezone database are reasonably correct.
  • Runs locally in the browser; no server round-trip for the clock.
Units
  • Civil local time (hours, minutes, seconds)
  • UTC offset JST +9 (fixed)
Boundary conditions
  • No DST transitions
Example
12:00 UTC → 21:00 Asia/Tokyo
Validation cases

3 published on this page

  • UTC 12:00 → 21:00 Asia/Tokyo
  • Same instant as Asia/Seoul → Identical clock time
  • Same instant as Asia/Shanghai → Tokyo is 1 hour later
Specification basis
  • IANA time zone database — Asia/Tokyo
  • Japan Standard Time (JST) = UTC+09:00
  • Japan: no Daylight Saving Time
Calculation version
1.0.1

Background

Interpretation and common distinctions.

Current time in Tokyo, Japan

This page shows a live local clock for Tokyo and all of Japan, using the IANA zone Asia/Tokyo. Time is read from your browser with that zone applied — UTC+9 all year.

This site’s legacy Japan time URL also points here.

Japan Standard Time (JST)

Name Abbreviation UTC offset DST
Japan Standard Time JST UTC+9 None

Japan does not observe Daylight Saving Time. The clock matches Seoul (Korea Standard Time).

How Tokyo time compares

  • Seoul: identical local time.
  • Beijing / Hong Kong / Singapore: Tokyo is 1 hour ahead.
  • Bangkok: Tokyo is 2 hours ahead.
  • India: Tokyo is 3 hours 30 minutes ahead.
  • London: 9 hours ahead of GMT; 8 hours ahead of BST.
  • New York: about 14 hours ahead of EST; 13 hours ahead of EDT.
  • UTC: always 9 hours ahead.

Other calculators in this family: Seoul Time, Beijing / China Time, Hong Kong Time, Singapore Time, UTC Time .

🕐 Seoul Time › 🕐 Beijing / China Time › 🕐 Hong Kong Time › 🕐 Singapore Time › 🌐 UTC Time ›
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Frequently asked questions

Key distinctions behind the calculation.

What time zone is Tokyo in?

Tokyo uses Japan Standard Time (JST). The IANA identifier is Asia/Tokyo. The offset is UTC+9 all year.

Does Japan observe Daylight Saving Time?

No. Japan does not currently observe DST. Clocks stay on JST (UTC+9) year-round.

Is all of Japan on the same time?

Yes. Japan has a single national time zone from Hokkaido to Okinawa.

Is Tokyo the same time as Seoul?

Yes — both are UTC+9. They use different IANA zones (Asia/Tokyo vs Asia/Seoul).

How does Tokyo compare to Beijing or Singapore?

Tokyo is always one hour ahead of UTC+8 cities such as Beijing, Hong Kong, and Singapore.

What is UTC?

Coordinated Universal Time is the global time standard. Japan is always UTC+9.