Privacy and data use

No account is required. Date calculations and holiday lookups run in your browser from static code and bundled data.

Calculation settings are saved in the page URL so refresh and language changes preserve your work. Opening or refreshing that URL sends its query parameters to the hosting service, where they may appear in access logs. Do not enter confidential dates. The hosting platform may also collect aggregate page-performance statistics; these are separate from the local calculation.

Network time

To estimate a reference time and device-clock difference, the browser requests a small static file from this site. The request contains no calculation inputs. Standard hosting logs may include IP address and user agent.

Sharing is your choice

A share poster may include a QR code whose URL contains the inputs needed to recreate its result. Anyone who receives it can read those inputs, so do not share confidential dates.

Calendar access

The site cannot read your Apple, Google, or Outlook calendar. ICS export creates a file only for the event you choose.

Analytics and advertising

This version contains no product event analytics, advertising code, tracking cookies, account identifiers, or tracking pixels.

Last updated: September 4, 2026.