Terms of use

Use of the data

The cities, countries and IANA time zone identifiers shown on ZoneShift are derived from public datasets and from the IANA Time Zone Database. The original sources retain their own licences, which apply to any redistribution of the underlying data. Our presentation of that data — the layout, the wording on each city page, the meeting-planner logic — is offered under a permissive licence: you may quote short excerpts and link to ZoneShift in your own articles or internal documents without asking us first.

For larger uses — for example, scraping the entire dataset to populate a competing product — please get in touch. We are generally happy to support that, but we would like to know it is happening so we can give you a stable snapshot rather than have you hammer the live site.

Accuracy and warranty

Time-zone data is a moving target: governments change daylight saving rules with surprisingly little notice, and the IANA database is updated several times a year to reflect those changes. ZoneShift rebuilds its dataset periodically, but there will always be a window between an upstream change and our next build. We strongly recommend that any high-stakes scheduling — for example, contractual deadlines, court appearances or flight bookings — be cross-checked against an authoritative source close to the event.

To the maximum extent permitted by law, ZoneShift is provided "as is" without warranty of any kind. We are not liable for missed meetings, missed flights, missed court dates, or missed birthdays caused by relying on the site.

Acceptable use

Please do not attempt to overwhelm the site with automated traffic. If you would like a programmatic data feed, the dataset is small enough to fit in a single JSON file and we can supply it on request. Please also do not attempt to deface or otherwise interfere with the site; we run it as a public good and we would like to keep doing so.