Privacy

TimezoneCalculator runs in your browser. Times, zones, participant names, itineraries and pasted data are processed on your device and are not sent to us or anyone else.

What is stored

Plans you create (meeting participants, recurring series, travel legs, world clocks and zone groups) are saved in your browser’s IndexedDB so they are there next time. Your 12/24-hour and theme choices are kept in localStorage. You can export or delete all of it on the About page. Private browsing modes may discard it when you close the window.

What is not collected

There are no accounts, no analytics, no session recording and no third-party scripts. The site does not put your inputs in URLs.

Advertising

Ad placements are reserved but currently disabled. If advertising is enabled in future, this page will be updated first and will describe the provider and its cookies.

Hosting

The site is served as static files. Like any web server, the host may keep standard access logs (IP address, requested page, time) for security and operations.

Last updated 30 October 2026.