A perpetual calendar to know the day of the week of the date you are looking for.
If you see a bug or a way to improve program, don't hesitate to go to the sections issues and pull requests, thank you.
This program was created for the needs of the "Math.en.Jeans" workshop, see more: https://www.mathenjeans.fr/content/arithm%C3%A9tique-modulaire-calendrier-perp%C3%A9tuel-lyc%C3%A9e-alain-chartier-bayeux-lyc%C3%A9e-jeanne-d%E2%80%99arc/ (it's in french)
This software is available under MIT license https://opensource.org/licenses/MIT
You can contact me by email by clicking here