Sunday 1 Jan New Year's Day
Monday 2 Jan New Year's Day observed
Monday 9 Jan Coming of Age Day
Saturday 11 Feb National Foundation Day
Tuesday 20 Mar Vernal Eqinox Day
Sunday 29 Apr Showa Day
Monday 30 Apr Showa Day observed
Thursday 3 May Constitution Day
Friday 4 May Greenery Day
Saturday 5 May Children’s Day
Monday 16 Jul Marine Day
Monday 17 Sep Respect for the Aged Day
Saturday 22 Sep Autumnal Equinox Day
Monday 8 Oct Health and Sports Day
Saturday 3 Nov Culture Day
Friday 23 Nov Labour Thanksgiving Day
Sunday 23 Dec Emperor’s Birthday
Monday 24 Dec Emperor’s Birthday observed
Monday 31 Jan New Year's Eve
Source: http://calendar.retira.eu/public-holidays/japan/2012/