Public holidays
1666, Suisse, Graubünden
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | Jour de l'An |
| 2 | Friday, 16 April 1666 | Vendredi Saint |
| 3 | Monday, 19 April 1666 | Lundi de Pâques |
| 4 | Thursday, 27 May 1666 | Jeudi de l'Ascension |
| 5 | Monday, 7 June 1666 | Lundi de la Pentecôte |
| 6 | Sunday, 1 August 1666 | Fête nationale suisse |
| 7 | Saturday, 25 December 1666 | Noël |
| 8 | Sunday, 26 December 1666 | Saint Étienne |