Japan's National Holidays in 2007
Date Holiday
1 Jan New Year's Holiday
8 Jan Coming of Age Day (the second Monday in January)
11 Feb National Foundation Day
12 Mon. Substitution (National Foundation Day)
21 Mar Vernal Equinox Day (around)
29 Apr Showa Day
30 Apr Substituion (Showa Day)
3 May Constitution Day
4 May Greenery Day
5 May Children's Day
16 Jul Marine Day(the third Monday in July)
17 Sep Respect-for-the-Aged Day(the third Monday in September)
24 Sep Autumnal Equinox Day (around) (Substitution)
8 Oct Health and Sports Day (the second Monday in October)
3 Nov Culture Day
23 Nov Labor Thanksgiving Day
23 Dec Emperor's Birthday
24 Dec Substituion (Emperor's Birthday)
[Note
] When a National Holiday falls on a Sunday, the following Monday becomes a holiday.
Source: http://www.th.emb-japan.go.jp/en/embassy/national.htm