Last updated: July 3, 2026
WeekCalc is provided free of charge for personal and commercial use. You may use the tool to determine week numbers and dates for any purpose, including scheduling, project management, and calendar planning.
WeekCalc calculates ISO 8601 week numbers according to the published specification. While we strive for accuracy and have verified our implementation against authoritative sources, we do not warrant that results are error-free for every edge case. We recommend cross-referencing critical dates with an official calendar.
WeekCalc is provided "as is" without warranty of any kind. We do not guarantee uninterrupted access, fitness for a particular purpose, or compliance with any local regulations.
In no event shall WeekCalc or its operators be liable for any direct, indirect, incidental, or consequential damages arising from the use of this tool.
We may update these Terms of Use at any time. Material changes will be reflected by updating the "Last updated" date above.
For questions about these terms, contact us at: contact@weekcalc.yzle.cn