Time zone · Asia
JST
Japan Standard Time
Japan Standard Time (JST) operates at a steady UTC+09:00 with no daylight saving transitions, keeping clocks consistent year‑round across the country. For colleagues in Tokyo, this stability simplifies scheduling with partners in Sydney, Singapore and elsewhere in Asia and the Pacific.
Thursday, October 15, 2026
Current offset
UTC+09:00
Standard · JST
Daylight saving
Not observed
Year-round standard time
IANA zones
1
None observe daylight saving
DST offset
—
No summer variant
About JST
A fixed, year-round offset.
Japan Standard Time (JST) operates at a steady UTC+09:00 with no daylight saving transitions, keeping clocks consistent year‑round across the country. For colleagues in Tokyo, this stability simplifies scheduling with partners in Sydney, Singapore and elsewhere in Asia and the Pacific.
IANA zones · the technical identifiers
The zone that resolve to JST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Cities across JST
Local time, city by city.
36 cities
Where JST is used
One country.
Same offset · UTC+09:00
Other zones at UTC+09:00 right now.
These named zones share JST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
JST to the world's clocks.
Frequently asked questions
Common questions about JST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Does Japan observe daylight saving time?
- No. Japan does not observe daylight saving time, so the offset remains UTC+09:00 throughout the year.
- How does JST schedule meetings with Sydney (UTC+10 or +11)?
- When Sydney is on standard time (UTC+10), it is 1 hour ahead of JST (UTC+09:00); during Sydney’s daylight saving (UTC+11), that gap widens to 2 hours.
- What makes Japan’s timekeeping unique?
- Japan abandoned daylight saving shortly after World War II and has kept a single, unchanging time zone (UTC+09:00) from 1951 onward, simplifying cross‑border business with neighboring Asian economies.
- Is JST always exactly 9 hours ahead of UTC?
- Since the last adjustment in September 1951, Japan Standard Time has been fixed at UTC+09:00 and has not changed by a single hour.
- Can JST simplify global team coordination?
- Because Japan Standard Time never shifts, teams can reuse the same UTC conversion offsets in software calendars and worldwide schedules without worrying about seasonal time changes.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
Moving off WorldTimeAPI? Our drop-in replacement needs no key.