Public holidays
1666, Finland
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | Nyårsdagen |
| 2 | Wednesday, 6 January 1666 | Trettondedag jul |
| 3 | Friday, 16 April 1666 | Långfredagen |
| 4 | Sunday, 18 April 1666 | Påskdagen |
| 5 | Monday, 19 April 1666 | Annandag påsk |
| 6 | Saturday, 1 May 1666 | Första maj |
| 7 | Thursday, 27 May 1666 | Kristi himmelsfärdsdag |
| 8 | Sunday, 6 June 1666 | Pingstdagen |
| 9 | Monday, 7 June 1666 | Annandag pingst |
| 10 | Thursday, 24 June 1666 | Midsommardagen |
| 11 | Sunday, 7 November 1666 | Alla helgons dag |
| 12 | Monday, 6 December 1666 | Självständighetsdagen |
| 13 | Saturday, 25 December 1666 | Juldagen |
| 14 | Sunday, 26 December 1666 | Annandag jul |