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