Public holidays
1805, Japan, Standard
| # | Date | Public holiday |
|---|---|---|
| 1 | Tuesday, 1 January 1805 | New Year's Day |
| 2 | Monday, 14 January 1805 | Coming of Age Day |
| 3 | Monday, 11 February 1805 | Foundation Day |
| 4 | Wednesday, 20 March 1805 | Vernal Equinox Day |
| 5 | Monday, 29 April 1805 | Shōwa Day |
| 6 | Friday, 3 May 1805 | Constitution Memorial Day |
| 7 | Saturday, 4 May 1805 | Greenery Day |
| 8 | Sunday, 5 May 1805 | Children's Day |
| Monday, 6 May 1805 | Children's Day (observance) | |
| 9 | Monday, 15 July 1805 | Marine Day |
| 10 | Monday, 16 September 1805 | Respect-for-Aged Day |
| 11 | Monday, 23 September 1805 | Autumnal Equinox Day |
| 12 | Monday, 14 October 1805 | Health and Sports Day |
| 13 | Sunday, 3 November 1805 | Culture Day |
| Monday, 4 November 1805 | Culture Day (observance) | |
| 14 | Saturday, 23 November 1805 | Labor Thanksgiving Day |
| 15 | Monday, 23 December 1805 | Emperor's Birthday |