Technical Specifications & Standards
Official chronometric properties, ISO standards, and international database registry identifiers for Japan Standard Time:
Daylight Saving Time (DST) Transitions
⬆️ Spring Forward (Clocks Advance)
None (Japan discontinued Daylight Saving Time in 1952)
⬇️ Fall Back (Clocks Return)
None
Observing Jurisdictions & Subdivisions
2 Sovereign NationsSovereign nations, administrative subdivisions, and regional territories officially operating under JST:
Regional Subdivisions & Territory Details
Financial Markets & Trading Hours
Opens the main trading session for developed Asian equity markets, finishing its trading day just as European bourses open their morning books.
Local Hours: 09:00 - 15:30 JST
UTC Window: 00:00 - 08:30 UTC
Local Hours: 08:45 - 15:15 JST
UTC Window: 00:00 - 08:30 UTC
Major Cities in JST
Primary metropolitan centers and financial hubs observing this time zone:
Adoption History & Astronomical Facts
Year Established: 1886
Promulgated by the Meiji government in Imperial Ordinance 51 on July 13, 1886, anchoring the nation's time on the 135th meridian east. General Douglas MacArthur's occupation administration enforced daylight saving between 1948 and 1951, but the Diet repealed it immediately upon regaining national sovereignty in 1952.
The city of Akashi built the Akashi Municipal Planetarium directly straddling the 135th meridian east, featuring a giant 54-meter clock tower known locally as the Time Monument.
Frequently Asked Questions about JST
What does JST stand for?
JST stands for Japan Standard Time, which is nine hours ahead of Coordinated Universal Time (UTC+9).
Does Japan observe Daylight Saving Time?
No. Japan has not changed its clocks for summer since 1951; JST remains UTC+9 all year.
What is the time difference between Tokyo and New York?
Tokyo is 14 hours ahead of New York during winter (EST) and 13 hours ahead during summer (EDT).