Last updated November 2026
The short version
The calculators run entirely in your browser. The dates you enter are not sent to us or stored by us.
Information we collect
- Contact form: if you send us a message, we receive the name, email address and message you provide, and use them only to reply to you.
- Server logs: our hosting provider may automatically log basic technical information such as IP address, browser type and pages visited, for security and reliability.
Cookies and advertising
We may show ads from third-party vendors, including Google. Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to users based on their visit to this site and/or other sites on the Internet.
You may opt out of personalised advertising by visiting Google Ads Settings, or opt out of some third-party vendors' use of cookies for personalised advertising at www.aboutads.info.
We may also use privacy-friendly analytics to understand which pages are useful. Where required by law, we will ask for your consent before setting non-essential cookies.
Children
This site is not directed at children under 13, and we do not knowingly collect their personal information.
Changes and contact
We may update this policy from time to time; the date above shows the latest version. Questions? Use our contact page.