New Year's Day
January 2
January 3
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
New Year's Eve
  January
  February
  March
  April
  May
  June
  July
  August
  September
  October
  November
  December
 ‹ 1665
1666
1667 › 
# Date Public holiday
1Friday, 1 January 1666 New Year's Day
2Saturday, 2 January 1666 January 2
3Sunday, 3 January 1666 January 3
4Monday, 11 January 1666 Coming of Age Day
5Thursday, 11 February 1666 Foundation Day
6Saturday, 20 March 1666 Vernal Equinox Day
7Thursday, 29 April 1666 Shōwa Day
8Monday, 3 May 1666 Constitution Memorial Day
9Tuesday, 4 May 1666 Greenery Day
10Wednesday, 5 May 1666 Children's Day
11Monday, 19 July 1666 Marine Day
12Monday, 20 September 1666 Respect-for-Aged Day
13Thursday, 23 September 1666 Autumnal Equinox Day
14Monday, 11 October 1666 Health and Sports Day
15Wednesday, 3 November 1666 Culture Day
16Tuesday, 23 November 1666 Labor Thanksgiving Day
17Thursday, 23 December 1666 Emperor's Birthday
18Friday, 31 December 1666 New Year's Eve