Convert time zones
Timezone Converter (JST/UTC and IANA time zones)
Convert a date-time between JST, UTC, and any IANA time zone. Results update instantly, with date rollovers and copy-friendly formats.
Convert time zones
Enter a date-time and convert it to another time zone in real time.
Converted result
Share this conversion
Copy a URL with the current state.
History (last 5)
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Batch convert (multiple lines)
One date-time per line. If no time zone is specified, the input time zone is used.
Batch results
कन्फिगरेसन
What you can do
- JST ↔ UTC conversion
- Convert between IANA time zones (e.g., Asia/Tokyo)
- Highlight date rollovers
- Batch conversion for multiple lines
How to use (3 steps)
- •Choose the input time zone.
- •Enter the date and time.
- •Copy the output format you need.
Common examples
Notes & tips
Using IANA zones (e.g., America/New_York) automatically applies DST rules for that date.
Results rely on the timezone data in your browser/OS and may differ across environments.
JST, PST, etc. may refer to multiple regions. Prefer IANA names for accuracy.
Action-safe margin (%)
How is DST handled?
If you specify an IANA time zone (e.g., America/New_York), DST is applied automatically for the selected date. Results can depend on your browser's timezone data.
Will I see date rollovers?
Yes. If the output date differs from the input date, a badge indicates previous/next day.
Can I convert multiple lines at once?
Yes. Use batch conversion to process one date-time per line and copy as CSV/TSV.
Is JST always UTC+9?
In practice, JST is operated as UTC+9 year-round.
How do I paste the result into a meeting invite?
Use the Display or ISO copy buttons depending on whether it's for humans or systems.