Public holidays
1666, Finland
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1666 | New Year's Day |
| 2 | Wednesday, 6 January 1666 | Epiphany |
| 3 | Friday, 16 April 1666 | Good Friday |
| 4 | Sunday, 18 April 1666 | Easter Sunday |
| 5 | Monday, 19 April 1666 | Easter Monday |
| 6 | Saturday, 1 May 1666 | May Day |
| 7 | Thursday, 27 May 1666 | Ascension Day |
| 8 | Sunday, 6 June 1666 | Whit Sunday |
| 9 | Saturday, 26 June 1666 | Midsummer Day |
| 10 | Saturday, 6 November 1666 | All Saints' Day |
| 11 | Monday, 6 December 1666 | Independence Day |
| 12 | Saturday, 25 December 1666 | Christmas Day |
| 13 | Sunday, 26 December 1666 | St Stephen's Day |