Terms of use

Last updated: 2026-09-14

Weeknumber.io provides general calendar tools and reference information. Results are offered without a guarantee that they are suitable for contractual, payroll, legal or safety-critical deadlines.

Your responsibility

Confirm important deadlines with the organization or system that defines them, especially when it may use a non-ISO week system or a different timezone.

Downloads

You may use the provided PDF and ICS files for personal and internal business planning. Do not present them as an official ISO publication.