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Time zone converter

Convert a meeting time across IANA zones without sending the date anywhere.

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

Browser zone: UTC. “Use now” fills this device’s local clock.

What this tool does

You enter a naive date and time plus a source zone. ConvertPass interprets that wall clock in the source zone, then reprints it in UTC and in each destination zone. Offsets come from the browser’s IANA database, including DST where the host has it.

How to use it

  1. Pick the source timezone, or use this browser’s zone.
  2. Enter the local date and time.
  3. Choose a destination zone and convert.
  4. Read the UTC instant and the destination wall clock.

Supported input

  • A date-time and IANA timezone names this browser recognises

Output

  • JSON with isoUtc, unixSeconds, offset, and a display string per zone

Privacy

This tool processes files and text locally in your browser. Your content is not uploaded or stored by this site.

ConvertPass does not include your input in analytics, URLs, or error reports. Encoding: ISO-8601 / IANA timezone identifiers. Limit: A single instant (4.0 KB).

Limitations

  • Only zones this browser ships are available. A curated shortlist is offered; exotic zones can be typed if the host knows them.
  • Times that fall in a DST gap or overlap can shift by one hour. ConvertPass does not pick a political interpretation for you.
  • This is civil time, not leap-second time. Use the UNIX timestamp tool for epoch seconds.

Example

Input
2024-01-15T12:00 in America/New_York
Output
{
  "isoUtc": "2024-01-15T17:00:00.000Z",
  "zones": [{ "timeZone": "Europe/London", "offset": "UTC+00:00" }]
}

January New York is on standard time, UTC−5.

Troubleshooting

The hour looks wrong around a DST change
Check whether that local time exists. Spring-forward gaps skip an hour; fall-back repeats one. ConvertPass uses a two-pass offset and still cannot invent the missing hour.
My city is missing from the list
Type a valid IANA name such as Pacific/Auckland. If the browser rejects it, that zone is not in this host’s data.

FAQ

Is this the same as the UNIX timestamp tool?

No. The timestamp tool translates epoch seconds and ISO strings in the host zone. This tool converts a wall clock between named IANA zones.

Does ConvertPass download a timezone database?

No. It uses Intl in this tab. Keep the OS timezone data reasonably current if you care about recent political changes.

Can I convert a timezone abbreviation like EST?

No. Abbreviations are ambiguous. Use America/New_York, not EST.

Are historical calendar reforms handled?

Only as far as this browser’s ICU data goes. Do not use this for pre-modern legal time.

Related tools

Related formats

Last reviewed 16 August 2026. Report a problem. Reports do not include your input.