Convert one time without guessing
Use this tool when you need the immediate answer to a question like 3:00 PM PST to JST, UTC to local time, or Tokyo to New York. The first result shows the converted time, the next-day or previous-day marker, and the time difference in plain language.
Why abbreviations need warnings
Short labels such as PST, EST, CST, and IST are easy to type and easy to misuse. PST is a fixed UTC-8 offset, while Pacific locations may use PDT on summer dates. CST and IST are ambiguous across countries.
When the date matters, use an IANA city time zone such as America/Los_Angeles, America/New_York, Europe/London, or Asia/Tokyo.
UTC, Zulu time, and offsets
The converter accepts UTC, Z, Zulu, and fixed offsets such as UTC+09:00, UTC-05:00, +09:00, and -0500.
Fixed UTC offsets are not full time zones. They do not include daylight saving time or local legal changes. For cities such as New York or London, use the city time zone when the date matters.
Common tasks
- Convert UTC logs into your browser time zone.
- Convert PST, PDT, EST, or EDT to Japan time.
- Compare Tokyo, New York, London, and UTC on one screen.
- Copy a result into Slack, email, Discord, or notes.
- Use the UTC ↔ JST compact chart while reading server logs or cron schedules.
Developer note
For a fixed offset such as JST, spreadsheet formulas can add 9/24 days to a UTC timestamp. That shortcut breaks for daylight-saving regions. In JavaScript, prefer Intl.DateTimeFormat with an IANA time zone; for Unix seconds or milliseconds, use the Unix Timestamp Converter.
Need formulas or code? Read How to Convert UTC to Local Time in Excel, Google Sheets, JavaScript, and SQL.
Privacy and accuracy
All calculations run in the browser using JavaScript and the browser’s Intl time zone data. The selected date, time, and zones are not sent to a server by this tool.
Time zone rules can change by country or region. For legal, financial, aviation, medical, or other high-stakes use, confirm with an official source or the people in the target location.
FAQ
What is the difference between PST and PDT?
PST is fixed UTC-8. PDT is fixed UTC-7. If you mean real Pacific local time on a specific date, use America/Los_Angeles or PT.
Does Japan use daylight saving time?
Japan currently uses JST, UTC+9, throughout the year.
Why does the converted time show next day?
The target zone may already be on the next calendar day. For example, 3:00 PM PST is 8:00 AM JST on the next day.
Should I use PST or Pacific Time?
Use PST only when the source explicitly says standard time. Use PT or America/Los_Angeles for real Pacific local time.
Can I convert UTC to my local time?
Yes. Use UTC or Z, then set the target to your browser time zone or click the detected browser time zone panel.