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Privacy policy

Last updated 30 October 2026.

What you enter

The dates and times you type into the calculators are used only inside your browser to produce the result. They are not sent to our server, not stored, and not shared.

Analytics and cookies

We use Google Analytics to count visits and see which pages are used. It sets cookies in your browser and collects technical information such as your approximate location (country or city), device and browser type, the pages you view and how you arrived. It does not receive the dates or times you type into the calculators. You can block it with your browser’s tracking protection, a content blocker or by turning off cookies, and the calculators will still work. You can also install Google’s browser opt-out add-on.

We do not currently show advertising. If that changes, we will update this page first.

Server logs

The site is delivered through a hosting provider (Vercel) and may sit behind a network service (Cloudflare). Like any website, these providers can record technical request data such as IP address, browser type and the pages requested, for security and operation. We do not use this to identify visitors.