Public holidays
1866, Finland
| # | Date | Public holiday |
|---|---|---|
| 1 | Monday, 1 January 1866 | New Year's Day |
| 2 | Saturday, 6 January 1866 | Epiphany |
| 3 | Friday, 30 March 1866 | Good Friday |
| 4 | Sunday, 1 April 1866 | Easter Sunday |
| 5 | Monday, 2 April 1866 | Easter Monday |
| 6 | Tuesday, 1 May 1866 | May Day |
| 7 | Thursday, 10 May 1866 | Ascension Day |
| 8 | Sunday, 20 May 1866 | Whit Sunday |
| 9 | Monday, 21 May 1866 | Whit Monday |
| 10 | Sunday, 24 June 1866 | Midsummer Day |
| 11 | Sunday, 4 November 1866 | All Saints' Day |
| 12 | Thursday, 6 December 1866 | Independence Day |
| 13 | Tuesday, 25 December 1866 | Christmas Day |
| 14 | Wednesday, 26 December 1866 | St Stephen's Day |