This site calculates working days and shows public holiday information using the open-source date-holidays library.
date-holidays notes that required attribution can be found inside its country data files. This site provides attribution in the footer on every page and via dedicated pages below.
Source: date-holidays data (derived from Wikipedia sources)
License: CC BY-SA 3.0
Changes: We do not modify the upstream holiday data. We compute derived outputs (counts and lists for selected ranges)
and present them via this site.
This attribution is provided in a reasonable manner and does not imply endorsement by Creative Commons, Wikipedia, or the date-holidays maintainers.
For a concise machine-readable version, see /attribution.