Privacy

Website measurement

Plausible measures page views and use of the calculators without analytics cookies. It receives the page address without the dates in your link, the type of calculator used and referring-page information supplied by your browser.

Google Analytics also receives page and calculation events. Storage and advertising permissions start denied. Google can still receive cookieless requests, including connection information such as your IP address. Our events omit your chosen dates, shared-link contents and referring-page address.

The calculators work without either measurement service. We do not sell the dates you enter or use them for advertising.

Dates and links

Dates and times you enter are not sent to a calculation server or saved by these tools. Copy link puts the chosen values after the hash in the address. That part is not sent in an ordinary page request, but anyone you share the link with can see the values. Avoid sharing a birthday you want to keep private.

Other websites and fonts

Fonts are served by this site. Links on the data and methodology pages open original sources, which have their own privacy policies. The web host may receive connection information such as an IP address when serving a page.

Messages

The contact form is not available, so this site does not currently collect messages or email addresses through a form.