JST Time Zone Converter
Enter a Japan date and time, then choose a destination time zone. Japan stays at UTC+9 throughout the year, while the converted result uses the destination's offset for that exact date.
General scheduling tool only. The source is fixed to Japan Standard Time. Destination offsets can change when governments revise time-zone or daylight-saving rules, so reconfirm critical travel, broadcast, trading, or legal deadlines near the event date.
Enter your scenario
Use the details that match your situation. Your estimate stays in this browser.
How this estimate works
- Japan Standard Time is defined as UTC plus 9 hours and does not change for daylight saving.
- The entered JST wall-clock time is converted to a UTC instant by subtracting nine hours.
- That instant is formatted in the selected IANA time zone, so historical and scheduled daylight-saving offsets are applied for the chosen date rather than assumed from today's offset.
Authoritative time references
- National Institute of Information and Communications Technology: Japan Standard Time
- Internet Assigned Numbers Authority: Time Zone Database
The converter uses the browser's implementation of IANA time-zone data. Keep browsers and operating systems updated so recent time-zone rule changes are available.
Frequently asked questions
Does Japan use daylight saving time?
No. Japan Standard Time remains UTC+9 throughout the year, so only the selected destination may change offset seasonally.
Will the converter handle daylight saving in New York, London, or Sydney?
Yes. It applies the selected IANA zone to the exact converted instant, allowing the browser's date-aware daylight-saving rules to determine the destination time.