JST to UTC Converter
Convert Japan Standard Time (JST) to UTC. JST is UTC+9 with no daylight saving time. Covers Tokyo, Osaka, and all of Japan.
Built by Michael Lip
Frequently Asked Questions
What is the JST to UTC offset?
Japan Standard Time (JST) is UTC+9 year-round. Japan does not observe Daylight Saving Time.
How do I convert JST to EST?
JST is 14 hours ahead of EST (13 hours ahead of EDT). For example, 9 AM JST is 7 PM EST the previous day. Use this tool for exact conversions on any date.
Does Japan observe Daylight Saving Time?
No. Japan has not observed DST since 1951. JST remains at UTC+9 throughout the entire year, making timezone calculations simpler.
How It Works
This tool runs entirely in your browser using vanilla JavaScript. No data is sent to any server. All conversions and calculations happen locally on your device, ensuring complete privacy.
EpochPilot uses the browser's built-in Intl.DateTimeFormat API and the IANA timezone database provided by your operating system. This means timezone conversions are always accurate, including Daylight Saving Time transitions.
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Privacy
Everything runs locally in your browser. No timestamps, dates, or personal data are transmitted to any server. The source code is open on GitHub.
Contact
EpochPilot is built and maintained by Michael Lip. For questions or feedback, email [email protected].