Privacy

Short version: your dates stay on your device.

Calculations

All calculators run in your browser. The dates you enter are not sent to a server.

Saved inputs

To save you retyping, each calculator remembers its last inputs in your browser's localStorage (keys starting with dmp:). This can include a date of birth if you use the age calculator. Nothing leaves your device.

The plain-English box

If you use the "Ask it in plain English" box, the sentence you type and today's date are sent to Vercel AI Gateway and processed by an OpenAI model to interpret it. Don't type personal information into it. We don't store these questions; server logs may briefly record errors.

Analytics

We use Ahrefs Web Analytics, a cookieless analytics service, to count page views and see which calculators are useful. No accounts, no advertising trackers.