JST — Japan Standard Time
JST is UTC+09:00 on every date, with no daylight saving. Tokyo keeps it all year.
Current time in JST
00:22:15
Japan Standard Time · UTC+09:00
About JST
Japan has no daylight saving time and uses a single time zone.
Working with JST
The same offset, UTC+09:00, is also used by KST. None of them changes for daylight saving, so they always show the same time. One hour to the west of JST in this directory sits CST (China) (UTC+08:00); one hour to the east, AEST (UTC+10:00).
Clock changes in JST
Japan Standard Time has no clock change at any point in the year; UTC+09:00 applies on every date, in Tokyo as everywhere else on the zone.
Clock history of Asia/Tokyo
| Period | Clocks set to | Seasonal changes |
|---|---|---|
| since 1900 | UTC+09:00 | 4 years with a change, 1948–1951 |
Who keeps UTC+09:00
All year: Tokyo, Seoul and Osaka.
Countries and territories that keep UTC+09:00 all year, from every entry in the tz database: parts of Indonesia, Japan, North Korea, Palau, parts of Russia, South Korea and Timor-Leste. Where it is kept all year, UTC+09:00 also goes by these names in the tz database: Eastern Indonesia Time, Korean Standard Time, Palau Time, Timor-Leste Time and Yakutsk Standard Time.
Where JST stands today
Japan Standard Time is UTC+09:00 today and will be UTC+09:00 on every other day. A recurring meeting anchored to JST never drifts against UTC, which makes it a dependable reference for logs kept in Tokyo and for schedules that run across a whole year.
A working day on JST
| Place | JST’s 09:00–17:00 there | Over the next 12 months |
|---|---|---|
| UTC | 00:00–08:00 | — |
| New York | 19:00–03:00 (previous day) / 20:00–04:00 (previous day) | none all year |
| London | 00:00–08:00 / 01:00–09:00 | none all year |
| Tokyo | 09:00–17:00 | always 8 h |
At 09:00 on a Monday on JST time, São Paulo, Lima, Mexico City, New York, Bogotá, Rio de Janeiro and 24 more are still on Sunday. At 17:00 on a Friday on JST time, no city in this directory has reached Saturday yet.
Sunrise and sunset on JST time in Tokyo
For the working hours Tokyo shares with New York and London, and for its sunrise and sunset through the year, see the Tokyo page.
How JST compares with other zones
Right now JST runs ahead of UTC, New York, London, Berlin, Dubai, Kolkata, Singapore and Los Angeles and behind Sydney.
| Zone | UTC offset | Difference from JST | Over the next 12 months |
|---|---|---|---|
| UTC | UTC+00:00 | 9h ahead | all year |
| New York | UTC-05:00 | 14h ahead | 14h ahead / 13h ahead |
| London | UTC+00:00 | 9h ahead | 9h ahead / 8h ahead |
| Berlin | UTC+01:00 | 8h ahead | 8h ahead / 7h ahead |
| Dubai | UTC+04:00 | 5h ahead | all year |
| Kolkata | UTC+05:30 | 3h 30m ahead | all year |
| Singapore | UTC+08:00 | 1h ahead | all year |
| Sydney | UTC+11:00 | 2h behind | 1h behind / 2h behind |
| Los Angeles | UTC-08:00 | 17h ahead | 17h ahead / 16h ahead |
Cities using JST
Convert JST to another zone
Related time zones
Time zone rules: IANA tz database release 2026c, applied when this page was generated on 2026-11-02.
Frequently asked questions
What is JST?
Japan Standard Time, JST, is UTC+09:00. Japan has no daylight saving time and uses a single time zone.
What is the IANA identifier for JST?
Asia/Tokyo, named after Tokyo. Its clock last changed on September 9, 1951, from UTC+10:00 to UTC+09:00, and it has kept UTC+09:00 since.
Does JST change for daylight saving?
No. Japan Standard Time keeps UTC+09:00 on every date; so does KST.
What time is it on JST when it is 09:00 in London?
18:00 until March 28, 2027 and from October 31, 2027; 17:00 from March 28, 2027 to October 31, 2027.
Is JST the same as KST?
As labels, both mean UTC+09:00. The places behind them, Tokyo and Seoul, show the same time on 365 days of the coming year.