JST
Japan Standard Time
UTC+9 — No daylight saving time
Abbreviation
JST
UTC Offset
UTC+9
Full Name
Japan Standard Time
DST
No
About JST — Japan Standard Time
Japan Standard Time (JST) is UTC+9, the permanent time zone of Japan. Japan has not observed daylight saving time since 1952. JST is shared by South Korea, whose Korea Standard Time (KST) has the same UTC+9 offset. JST is 9 hours ahead of UTC, 9 hours ahead of London in winter, and 14 hours ahead of New York in winter. The Tokyo Stock Exchange—the third largest in the world by market capitalization—operates on JST, and trading hours are 9:00 AM to 3:30 PM JST.
Countries Using JST
- Japan
- South Korea (KST, same offset)
Major Cities in JST
Conversion Examples for JST
| UTC Time | JST (UTC+9) |
|---|---|
| 00:00 UTC | 09:00 JST |
| 06:00 UTC | 15:00 JST |
| 09:00 UTC | 18:00 JST |
| 12:00 UTC | 21:00 JST |
| 15:00 UTC | 00:00 JST |
| 18:00 UTC | 03:00 JST |
| 21:00 UTC | 06:00 JST |
Related Time Zones
Tools
About JST (JST)
JST (UTC+9) is a standard time zone designation used by Japan, South Korea (KST, same offset). Time zone abbreviations like JST refer to a specific UTC offset rather than a geographic region — multiple time zones around the world may share the same offset while using different local names.
When scheduling internationally, it is more reliable to refer to a city name or IANA time zone identifier (like America/New_York or Asia/Dubai) than to a short abbreviation, since abbreviations are not globally standardised and can be ambiguous — for example, CST refers to both Central Standard Time (UTC−6) in North America and China Standard Time (UTC+8).
Use the conversion table on this page to see what any UTC hour maps to in JST, and use the tools below to convert between JST and any other time zone or city in real time.
UTC Offset vs IANA Time Zone: What's the Difference?
UTC Offset
A UTC offset like UTC+4 or UTC−5 is a simple number expressing how many hours and minutes a location is ahead of or behind Coordinated Universal Time. It is fixed and does not carry any information about DST rules or transitions.
IANA Time Zone
An IANA identifier like Europe/London or Asia/Tokyo is a database entry that includes the full history of UTC offset changes, DST rules, and historical exceptions for that location. IANA identifiers should always be preferred in software and scheduling systems.
Convert JST Time
JST — Frequently Asked Questions
JST is UTC+9, Japan's permanent time zone. Japan does not observe daylight saving time. JST is also shared by South Korea (KST, UTC+9).
No. Japan abandoned daylight saving time in 1952 and has not observed it since. JST stays at UTC+9 year-round.
JST (UTC+9) is 9 hours ahead of GMT (UTC+0).
JST (UTC+9) is 14 hours ahead of EST (UTC−5) in winter and 13 hours ahead of EDT (UTC−4) in summer.