Privacy
The calculator runs entirely in your browser. The dates you enter are processed on your device and never transmitted to us.
Analytics
This site uses Google Analytics to count visits and see which pages are useful. It records the page you viewed, a rough location derived from your IP address (which is truncated before storage), and general device and browser details. It does not receive the values you type in — those stay in your browser. Google explains its part at policies.google.com/technologies/partner-sites.
Advertising
This site is funded by Google AdSense. Google and its partners may use cookies or device identifiers to serve and measure ads, including personalised ads where you have consented. Manage your choices at myadcenter.google.com and read how Google uses data from sites that use its services at policies.google.com/technologies/partner-sites.
Advertising cookies (Google AdSense)
This site shows ads served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this site and other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visits to this and/or other sites on the Internet.
You can opt out of personalised advertising at Google Ads Settings, or opt out of some third-party vendors' cookies at www.aboutads.info. See how Google uses information from sites that use its services. Visitors in the EEA, UK and Switzerland are asked for consent through Google's certified consent message first.