Privacy Policy

1. What we collect: nothing you calculate

Every calculator on this site — date difference, add/subtract, and age — runs entirely in your browser using JavaScript. The dates, times, and results you work with are processed on your device and are never transmitted to our servers, logged, or stored. We couldn't see your data even if we wanted to, because it never reaches us.

We do not require accounts, we do not ask for your name or email to use any tool, and we do not sell data — there is no calculation data to sell.

2. What your browser stores locally

The site saves exactly one preference in your browser's localStorage: your light/dark theme choice (under the key theme). This never leaves your device, is not readable by us remotely, and you can clear it anytime via your browser settings. If you've never toggled the theme, nothing is stored for it.

Separately, Google Analytics sets its own first-party cookies (names starting with _ga) to count visits — see section 4.

3. Standard server logs

Like virtually all websites, our hosting provider may automatically record basic technical request data (such as IP address, user agent, and requested URL) in transient server logs. This is standard infrastructure operation, is not used to profile visitors, and is not combined with any calculation data — which, again, we never receive.

4. Third-party services

Fonts. The Inter and JetBrains Mono typefaces are self-hosted and served from this site's own domain, so loading them makes no request to Google or any other font provider.

Analytics. We use Google Analytics to understand how many people visit and which pages they use. When a page loads, Google receives standard usage data such as the page address, referrer, approximate location derived from your IP address, and device/browser type, and sets _ga cookies to distinguish visits. The dates and results you enter into the calculators are not sent. You can opt out with Google's Analytics opt-out add-on or by blocking cookies.

Advertising. This site may display advertisements served by Google AdSense to support its free operation. Google and its partners may use cookies or similar technologies to serve ads based on your prior visits to this or other websites. You can opt out of personalized advertising at Google Ads Settings, or manage industry opt-outs at aboutads.info. Where required by law (for example, in the EU/EEA and UK), a consent banner will ask for your permission before non-essential cookies are used.

5. Your choices and rights

• ✓Clear the theme preference (and any ad cookies) anytime through your browser's site-data settings.
• ✓Use the site with cookies blocked or private browsing enabled — all calculators keep working.
• ✓Request deletion of any personal correspondence by emailing [email protected].

Because we don't collect calculation data or offer accounts, there is no personal profile for us to export, correct, or delete — deletion of browser data on your side removes everything the site has stored.

6. Children's privacy

The site is a general-audience utility and does not knowingly collect personal information from anyone, including children under 13. Age calculations are performed locally and never transmitted, in line with our privacy-first design.

7. Changes to this policy

If we make material changes, we'll update the "Last updated" date above and, for significant changes, announce them on the homepage. Continued use of the site after changes constitutes acceptance of the updated policy.

8. Contact

Questions about this policy? Email [email protected] or use the contact page.