Sources and licences
Free to use, with credit.
Holibase is a non-profit open data project. You can use the data and the API in any project, also commercially, as long as you credit the sources.
Holibase data
School calendars, district data and corrections
Code
API, importers and this website
How to credit
Show this line where the data appears, for example in your footer, an about page or the calendar view. Every API response carries it in the attribution field.
Public holidays © python-holidays contributors (MIT). School calendars © Holibase contributors (CC BY 4.0). https://holibase.org
01. Sources
Where the data comes from
| Source | Used for | Licence | Updated |
|---|---|---|---|
| python-holidays | Public holidays for all countries; school holidays for some countries | MIT | Weekly |
| NCES Common Core of Data | Directory of US school districts, enrolment, location | Public domain | Monthly |
| Rijksoverheid | School holidays in the Netherlands | CC0 | Weekly |
| Ministère de l’Éducation nationale | School holidays in France, including overseas regions | Licence Ouverte 2.0 | Weekly |
| Holibase research | School calendars researched from each authority’s published calendar, for example US school districts | CC BY 4.0 | Each school year |
Every calendar in the API names its source document and the date it was retrieved, so you can check it against the original.
02. Accuracy
Check the dates that matter.
- Verified calendars come from official open data, a maintained library or a researched calendar checked against the authority’s document.
- Unverified calendars are returned only on request and are marked as such on the website.
- Schools can still change their calendar, for example after snow days. For important decisions, confirm with the school or district.
- Found a mistake? Open an issue on GitHub with a link to the official calendar.
03. Privacy
No account, analytics only with consent.
Holibase needs no account and stores no personal data. Google Analytics only runs if you accept it in the cookie banner, and you can change that any time under Cookie settings. Details are in the privacy policy.