holidays/data/jp.yaml

# Japanese holiday definitions for Ruby Holiday gem.
# Reference: http://www.h3.dion.ne.jp/~sakatsu/holiday_topic.htm
#
# This definition can calculate current Japanese holidays,
# don't compat with past changes of Japan Holiday Act.
#
# CHANGES:
#  2010-12-25: Initial version by Tatsuki Sugiura <sugi@nemui.org>
# 
---
months:
  1:
  - name: 元日
    regions: [jp]
    mday: 1
  - name: 成人の日
    regions: [jp]
    wday: 1
    week: 2
  2:
  - name: 建国記念日
    regions: [jp]
    mday: 11
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 2, 11)
  3:
  - name: 春分の日
    regions: [jp]
    function: jp_vernal_equinox_day(year)
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(Holidays.jp_vernal_equinox_day(year))
  4:
  - name: 昭和の日
    regions: [jp]
    mday: 29
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 4, 29)
  5:
  - name: 憲法記念日
    regions: [jp]
    mday: 3
  - name: みどりの日
    regions: [jp]
    mday: 4
  - name: こどもの日
    regions: [jp]
    mday: 5
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 5, 3)
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 5, 5)
  7:
  - name: 海の日
    regions: [jp]
    wday: 1
    week: 3
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 7, Date.calculate_mday(year, 7, 3, 1))
  9:
  - name: 敬老の日
    regions: [jp]
    wday: 1
    week: 3
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 9, Date.calculate_mday(year, 9, 3, 1))
  - name: 国民の休日
    regions: [jp]
    function: jp_citizons_holiday(year)
  - name: 秋分の日
    regions: [jp]
    function: jp_national_culture_day(year)
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(Holidays.jp_national_culture_day(year))
  10:
  - name: 体育の日
    regions: [jp]
    wday: 1
    week: 2
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 10, Date.calculate_mday(year, 10, 2, 1))
  11:
  - name: 文化の日
    regions: [jp]
    mday: 3
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 11, 3)
  - name: 勤労感謝の日
    regions: [jp]
    mday: 23
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 11, 23)
  12:
  - name: 天皇誕生日
    regions: [jp]
    mday: 23
  - name: 振替休日
    regions: [jp]
    function: jp_substitute_holiday(year, 12, 23)
methods:
  jp_vernal_equinox_day: |
    def self.jp_vernal_equinox_day(year)
      day =
        case year
        when 1851..1899
          19.8277
        when 1900..1979
          20.8357
        when 1980..2099
          20.8431
        when 2100..2150
          21.8510
        else
          raise IndexError.new("Out of range")
        end
      day += 0.242194 * (year - 1980) - ((year - 1980)/4).floor
      day = day.floor
      Date.civil(year, 3, day)
    end    
  jp_national_culture_day: |
    def self.jp_national_culture_day(year)
      day =
        case year
        when 1851..1899
          22.2588
        when 1900..1979
          23.2588
        when 1980..2099
          23.2488
        when 2100..2150
          24.2488
        else
          raise IndexError.new("Out of range")
        end
      day += 0.242194 * (year - 1980) - ((year - 1980)/4).floor
      day = day.floor
      Date.civil(year, 9, day)
    end    
  jp_citizons_holiday: |
    def self.jp_citizons_holiday(year)
      year < 2003 and return nil
      ncd = Holidays.jp_national_culture_day(year)
      if ncd.wday == 3
        ncd - 1
      else
        nil
      end
    end    
  jp_substitute_holiday: |
    def self.jp_substitute_holiday(*date)
      date = date[0].kind_of?(Date) ? date.first : Date.civil(*date)
      date.wday == 0 ? date+1 : nil
    end    
tests: |
  {Date.civil(2008,1,1) => '元日', 
   Date.civil(2010,1,11) => '成人の日', 
   Date.civil(2008,2,11) => '建国記念日',
   Date.civil(2008,4,29) => '昭和の日',
   Date.civil(2008,5,3) => '憲法記念日',
   Date.civil(2008,5,5) => 'こどもの日',
   Date.civil(2010,7,19) => '海の日',
   Date.civil(2010,9,20) => '敬老の日',
   Date.civil(2010,10,11) => '体育の日',
   Date.civil(2008,11,3) => '文化の日',
   Date.civil(2008,11,23) => '勤労感謝の日',
   Date.civil(2008,12,23) => '天皇誕生日',
   Date.civil(2010,3,22) => '振替休日',
   Date.civil(2008,11,24) => '振替休日',
  }.each do |date, name|
     assert_equal name, (Holidays.on(date, :jp, :informal)[0] || {})[:name]
  end
  
  # vernal equinox day
  [Date.civil(2004,3,20), Date.civil(2005,3,20), Date.civil(2006,3,21),
   Date.civil(2007,3,21), Date.civil(2008,3,20), Date.civil(2009,3,20),
   Date.civil(2010,3,21)].each do |date|
    assert_equal '春分の日', Holidays.on(date, :jp)[0][:name]
  end

  # national culture day
  [Date.civil(2004,9,23), Date.civil(2005,9,23), Date.civil(2006,9,23),
   Date.civil(2007,9,23), Date.civil(2008,9,23), Date.civil(2009,9,23),
   Date.civil(2010,9,23), Date.civil(2011,9,23), Date.civil(2012,9,22),
   Date.civil(2013,9,23)].each do |date|
    assert_equal '秋分の日', Holidays.on(date, :jp)[0][:name]
  end

  # citizens holiday
  [Date.civil(2032,9,21), Date.civil(2049,9,21), Date.civil(2009,9,22),
   Date.civil(2015,9,22), Date.civil(2026,9,22)].each do |date|
    assert_equal '国民の休日', Holidays.on(date, :jp)[0][:name]
  end