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.

Runs entirely in your browser Date rollover highlights Multi-zone output

Convert time zones

Enter a date-time and convert it to another time zone in real time.

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Up to {max} outputs
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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)

  1. Choose the input time zone.
  2. Enter the date and time.
  3. Copy the output format you need.

Common examples

2026-01-31 09:00 JST
→ 2026-01-31 00:00 UTC
2026-01-01 00:30 JST
→ 2025-12-31 15:30 UTC
Previous day

Notes & tips

IANA time zones handle DST

Using IANA zones (e.g., America/New_York) automatically applies DST rules for that date.

Timezone data depends on your environment

Results rely on the timezone data in your browser/OS and may differ across environments.

Abbreviations can be ambiguous

JST, PST, etc. may refer to multiple regions. Prefer IANA names for accuracy.

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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.