Public holidays
1644, Japan, Banks
| # | Date | Public holiday |
|---|---|---|
| 1 | Friday, 1 January 1644 | New Year's Day |
| 2 | Saturday, 2 January 1644 | January 2 |
| 3 | Sunday, 3 January 1644 | January 3 |
| 4 | Monday, 11 January 1644 | Coming of Age Day |
| 5 | Thursday, 11 February 1644 | Foundation Day |
| 6 | Sunday, 20 March 1644 | Vernal Equinox Day |
| 7 | Friday, 29 April 1644 | Shōwa Day |
| 8 | Tuesday, 3 May 1644 | Constitution Memorial Day |
| 9 | Wednesday, 4 May 1644 | Greenery Day |
| 10 | Thursday, 5 May 1644 | Children's Day |
| 11 | Monday, 18 July 1644 | Marine Day |
| 12 | Monday, 19 September 1644 | Respect-for-Aged Day |
| 13 | Friday, 23 September 1644 | Autumnal Equinox Day |
| 14 | Monday, 10 October 1644 | Health and Sports Day |
| 15 | Thursday, 3 November 1644 | Culture Day |
| 16 | Wednesday, 23 November 1644 | Labor Thanksgiving Day |
| 17 | Friday, 23 December 1644 | Emperor's Birthday |
| 18 | Saturday, 31 December 1644 | New Year's Eve |