Public holidays
1804, Japan, Standard
| # | Date | Public holiday |
|---|---|---|
| 1 | Sunday, 1 January 1804 | New Year's Day |
| Monday, 2 January 1804 | New Year's Day (observance) | |
| 2 | Monday, 9 January 1804 | Coming of Age Day |
| 3 | Saturday, 11 February 1804 | Foundation Day |
| 4 | Tuesday, 20 March 1804 | Vernal Equinox Day |
| 5 | Sunday, 29 April 1804 | Shōwa Day |
| Monday, 30 April 1804 | Shōwa Day (observance) | |
| 6 | Thursday, 3 May 1804 | Constitution Memorial Day |
| 7 | Friday, 4 May 1804 | Greenery Day |
| 8 | Saturday, 5 May 1804 | Children's Day |
| 9 | Monday, 16 July 1804 | Marine Day |
| 10 | Monday, 17 September 1804 | Respect-for-Aged Day |
| 11 | Sunday, 23 September 1804 | Autumnal Equinox Day |
| Monday, 24 September 1804 | Autumnal Equinox Day (observance) | |
| 12 | Monday, 8 October 1804 | Health and Sports Day |
| 13 | Saturday, 3 November 1804 | Culture Day |
| 14 | Friday, 23 November 1804 | Labor Thanksgiving Day |
| 15 | Sunday, 23 December 1804 | Emperor's Birthday |
| Monday, 24 December 1804 | Emperor's Birthday (observance) |