Privacy

Short version: the dates you enter never leave your device.

What the tools do with your input

Every calculation on WeekNumber — today’s week, date lookups, reverse lookups and the year calendars — runs as JavaScript in your own browser, or was generated when the page was built. There is no account, no sign-up and no form that submits your dates to a server. The site cannot see which dates you look up.

Cookies and storage

The tools do not set cookies and do not use local storage to remember your input. If that ever changes for a convenience feature (such as remembering a preferred counting system), this page will say so.

Hosting

The site is served as static files by Cloudflare Pages. Like any web host, Cloudflare may process standard request data (such as IP addresses) to deliver the pages and protect the service; that processing is governed by Cloudflare’s own privacy policy. WeekNumber itself collects no analytics about your calculations.

Changes

If this policy changes, the new text will appear on this page. The current version applies from the site’s launch in October 2026.