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Everyday Tools

Time Zone Calculator

Convert a date and time between any two IANA time zones — DST handled correctly.

Runs locally·Free, no signup·Updated May 6, 2026
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How it works

A walkthrough, end to end.

  1. 1

    Pick a source date/time and a source time zone.

  2. 2

    Pick a target time zone.

  3. 3

    See the converted local time, including the offset from UTC and weekday.

Reference

Time zone conversion

Each IANA zone has rules including standard offset and DST transitions. Conversion uses the browser's Intl.DateTimeFormat with the chosen zone.

Use cases

What you can do with this.

Scheduling meetings

Find what 9 AM Tokyo is in New York.

Travel planning

Convert flight times across time zones.

Remote teams

Coordinate stand-ups across continents.

Live broadcasts

Find when an event airs in your zone.

DST awareness

See how DST shifts the local time.

Booking calls

Avoid mistakes booking client calls abroad.

Server logs

Translate UTC timestamps into local time.

Time zones 2026 — what's current

IANA zoneinfo is the standard; calculator wins for instant DST-correct conversion.

FAQ

Frequently asked.

  • All IANA zones (e.g. America/New_York, Asia/Tokyo).

  • Handled automatically by the browser's Intl support.

  • No. All conversions run locally.

  • Output uses 24-hour HH:MM and includes the day of the week.