Public holidays
1644, Poland, National public holidays
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year's Day |
| 2 | Wednesday, 6 January 1644 | Epiphany |
| 3 | Sunday, 27 March 1644 | Easter Sunday |
| 4 | Monday, 28 March 1644 | Easter Monday |
| 5 | Sunday, 1 May 1644 | Labour Day |
| 6 | Tuesday, 3 May 1644 | Constitution Day |
| 7 | Sunday, 15 May 1644 | Pentecost Sunday |
| 8 | Thursday, 26 May 1644 | Corpus Christi |
| 9 | Monday, 15 August 1644 | Assumption of Mary |
| 10 | Tuesday, 1 November 1644 | All Saints' Day |
| 11 | Friday, 11 November 1644 | Independence Day |
| 12 | Sunday, 25 December 1644 | Christmas Day |
| 13 | Monday, 26 December 1644 | Boxing Day/Christmas Eve |