Privacy Policy
Last updated: July 23, 2026
The short version: the dates you type into DateSpan's calculators never leave your device. This page explains that in full and covers advertising and cookies.
Calculations stay in your browser
Every DateSpan calculator runs entirely in your web browser using JavaScript. When you enter a birth date, a test date, or any other value, the calculation happens on your device and the result is displayed there. We do not send, upload, log, or store the dates or numbers you enter. There is no server-side processing of your inputs, no account, and no database of your calculations. Closing or refreshing the page discards whatever you typed.
Information we do and do not collect
We do not ask for your name, email, or any personal details to use the tools. Like most websites, our hosting provider may automatically record standard technical request logs (such as IP address, browser type, and the page requested) for security and reliability. We do not use these logs to identify individuals, and we do not combine them with the contents of your calculations, which we never receive.
Advertising and Google AdSense
DateSpan is supported by advertising. We use Google AdSense to display ads. Google is a third-party vendor that uses cookies and similar technologies 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 DateSpan and other sites on the internet.
- Third-party vendors and ad networks may also use cookies to serve ads, measure their performance, and limit how often you see a given ad.
- These cookies are set by the advertising services, not by our calculators, and they cannot see the dates you enter into our tools.
You can opt out of personalised advertising by visiting Google Ads Settings. You can also learn about your choices and opt out of many third-party vendors' use of cookies at aboutads.info/choices and youronlinechoices.eu. If you are in a region that requires consent for advertising cookies, Google's consent mechanisms apply where legally required.
Cookies and local storage
DateSpan's own tools do not require cookies to function, and we do not use cookies to track you across the web. Cookies present on the site are set by third-party services such as Google AdSense as described above. You can control or delete cookies through your browser settings; blocking advertising cookies will not stop the calculators from working.
Analytics
If we use a privacy-respecting analytics service to understand aggregate traffic (for example, how many people visited a page), it is configured to measure trends only and not to identify you or capture the contents of your calculations.
Children
DateSpan is a general-audience utility and is not directed at children. Although professionals may calculate a child's age using our tools, those calculations happen locally and are never transmitted to us, so we do not knowingly collect any personal information from children.
Your choices
- Use your browser's private/incognito mode to keep no local history of your visit.
- Adjust or clear cookies in your browser settings at any time.
- Opt out of personalised ads using the links above.
Changes to this policy
We may update this policy to reflect changes to the site or to advertising and legal requirements. When we do, we will revise the "last updated" date above. Continued use of the site after a change means you accept the updated policy.
Contact
Questions about privacy? Email contact@keephand.com.