Day Date Month Holiday
Sunday 01 Jan New Year's Day
Monday 02 Jan New Year's Day observed
Monday 09 Jan Coming of Age Day
Saturday 11 Feb National Foundation Day
Monday 20 Mar Spring Equinox
Saturday 29 Apr Showa Day
Wednesday 03 May Constitution Memorial Day
Thursday 04 May Greenery Day
Friday 05 May Children's Day
Monday 17 Jul Sea Day
Friday 11 Aug Mountain Day
Monday 18 Sep Respect for the Aged Day
Saturday 23 Sep Autumn Equinox
Monday 09 Oct Sports Day
Friday 03 Nov Culture Day
Thursday 23 Nov Labor Thanksgiving Day
Saturday 23 Dec Emperor's Birthday
Source: https://www.timeanddate.com/holidays/japan/2017#!hol=9