New Year's Day
New Year's Day (obs.)
Coming of Age Day
Foundation Day
Vernal Equinox Day
Shōwa Day
Constitution Memorial Day
Greenery Day
Children's Day
Marine Day
Respect-for-Aged Day
Autumnal Equinox Day
Health and Sports Day
Culture Day
Labor Thanksgiving Day
Emperor's Birthday
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 ‹ 1819
1820
1821 › 
# Date Public holiday
1Saturday, 1 January 1820 New Year's Day
Monday, 3 January 1820 New Year's Day (observance)
2Monday, 10 January 1820 Coming of Age Day
3Friday, 11 February 1820 Foundation Day
4Monday, 20 March 1820 Vernal Equinox Day
5Saturday, 29 April 1820 Shōwa Day
6Wednesday, 3 May 1820 Constitution Memorial Day
7Thursday, 4 May 1820 Greenery Day
8Friday, 5 May 1820 Children's Day
9Monday, 17 July 1820 Marine Day
10Monday, 18 September 1820 Respect-for-Aged Day
11Saturday, 23 September 1820 Autumnal Equinox Day
12Monday, 9 October 1820 Health and Sports Day
13Friday, 3 November 1820 Culture Day
14Thursday, 23 November 1820 Labor Thanksgiving Day
15Saturday, 23 December 1820 Emperor's Birthday