holiday_jp 
Japanese holiday datasets
holiday_jp Versions, Version, 振替休日の表記, ---, ---, v0.x, 振替休日, v1.x, 勤労感謝の日 振替休日, ## Implemantations, Implemantation, Release version using holiday_jp v0.x, Release version using holiday_jp v1.x, ---, ---, ---, Ruby, v0.7.x, -, JavaScript, v1.x, v2.x, PHP, v1.x, v2.x, Java, -, v2.x, Swift, v0.1.x, v0.2.x, Go, -, master, Elixir, v0.2.2, >= v0.2.3, ## "Datasets" idea
Test by syukujitsu.csv
syukujitsu.csv
出典：内閣府ホームページ ( https://www8.cao.go.jp/chosei/shukujitsu/gaiyou.html )
Test by Google Calendar API
https://calendar.google.com/calendar/embed?src=ja.japanese%23holiday@group.v.calendar.google.com