Calendar weeks
Privacy policy
Last updated: October 9, 2026
CalendarWeeks is a free reference site for ISO-8601 calendar week numbers. Data collection here is kept to the absolute minimum: there is no account, no sign-up and no personal profile of you. This page explains what that means in practice, including the cookies used by the advertising on the site.
Data we do not collect
Every part of this site can be used without registering. We do not ask for your name, email address or payment details, we have no newsletter and no comment forms, and we do not build visitor profiles.
The date you choose in the week finder is calculated inside your own browser. It is never sent to us and it is not stored anywhere.
Server logs
Like every website, our hosting provider records standard technical information when a page is requested, such as IP address, browser type, the page requested and a timestamp. These logs are used only to keep the site secure and available, and are not used to identify individuals.
Advertising and cookies
This site is supported by advertising served by Google. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the internet.
You can opt out of personalised advertising at any time:
- Google Ads Settings — review and turn off personalised advertising.
- How Google uses cookies in advertising — Google's own explanation of its ad cookies.
- aboutads.info and youronlinechoices.com — opt out of some third-party vendors' use of cookies for personalised advertising.
If you are in the EEA, the UK or Switzerland, a consent message from Google is displayed before any advertising cookies are set, and you can change or withdraw that choice at any time.
Analytics
This site does not run its own analytics, profiling or tracking scripts. No statistics about individual visitors are compiled by us.
Links to other websites
Some pages link to external websites, for example to Google's advertising settings. We are not responsible for the content or the privacy practices of those websites; their own policies apply once you leave this site.
Your rights
If you are in the EEA, the UK or Switzerland you have the right to access, correct, delete, restrict or object to the processing of your personal data, and to lodge a complaint with the data protection authority in your country.
We hold no personal data about you, so these rights apply mainly to data controlled by Google as an advertising provider — the links above are the quickest way to exercise them there. For anything relating to this site itself, please get in touch.
Children
This site is not directed at children under 13, and we do not knowingly collect personal data from them.
Changes to this policy
If this policy changes, the revised version will be published on this page with a new "last updated" date.
Contact
Questions, corrections to the calendar data, advertising enquiries and data-protection requests are all welcome.