Privacy policy

Short version: the dates you enter stay on your device. All calculations run in your browser.

What you enter

Dates and numbers typed into the calculator are processed by JavaScript inside your browser tab. They are not transmitted to us or anyone else and are not stored after you close or reload the page.

Cookies

The site sets no first-party tracking cookies of its own. If analytics or advertising are enabled (see below), those third-party services may set cookies in your browser. You can block or delete cookies in your browser settings; the calculator keeps working without them.

Analytics

We may use privacy-respecting, aggregate analytics to count page views and understand which pages are useful. Where used, this collects general, non-identifying information such as page URL, referrer, approximate region and device type. It never includes the dates you enter.

Advertising and third-party vendors

This site may display advertising, including through Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet. You can opt out of personalised advertising by visiting Google's Ads Settings, and you can review choices for many third-party vendors at aboutads.info. Advertising partners may collect data as described in their own privacy policies.

Your choices

Because we never receive what you type into the calculator, there is nothing for us to access, correct or delete. For cookies set by advertising or analytics vendors, use your browser controls and the vendors' own opt-out tools.

Changes

We may update this policy as the site evolves; changes will appear on this page. Questions? See the contact page.