### 日本の休日を JavaScript で計算するためのライブラリ Osamu Takeuchi ### "use strict" # 元の時刻から指定時間だけずらした時刻を生成して返す shiftDate = (date, year, mon, day, hour, min, sec, msec) -> # まずは日付以下の部分を msec に直して処理する res = new Date(2000,0,1) res.setTime( date.getTime() + (((( day ? 0 ) * 24 + ( hour ? 0 )) * 60 + ( min ? 0 )) * 60 + ( sec ? 0 )) * 1000 + ( msec ? 0 ) ) # 年と月はちょっと面倒な処理になる res.setFullYear res.getFullYear() + ( year ? 0 ) + Math.floor( ( res.getMonth() + ( mon ? 0 ) ) / 12 ) res.setMonth ( ( res.getMonth() + ( mon ? 0 ) ) % 12 + 12 ) % 12 return res u2j = (d) -> shiftDate(d,0,0,0,+9) j2u = (d) -> shiftDate(d,0,0,0,-9) uDate = (y,m,d) -> new Date(Date.UTC(y,m,d)) jDate = (y,m,d) -> j2u uDate(y,m,d) getJDay = (d) -> (u2j d).getUTCDay() getJDate = (d) -> (u2j d).getUTCDate() getJMonth = (d) -> (u2j d).getUTCMonth() getJFullYear = (d) -> (u2j d).getUTCFullYear() getJHours = (d) -> (u2j d).getUTCHours() getJMinutes = (d) -> (u2j d).getUTCMinutes() ### ヘルパ関数 ### # 年を与えると指定の祝日を返す関数を作成 simpleHoliday = (month, day) -> (year) -> jDate(year, month-1, day) # 年を与えると指定の月の nth 月曜を返す関数を作成 happyMonday = (month, nth) -> (year) -> monday = 1 first = jDate(year, month-1, 1) shiftDate( first, 0, 0, ( 7 - ( getJDay(first) - monday ) ) % 7 + ( nth - 1 ) * 7 ) # 年を与えると春分の日を返す shunbunWithTime = (year) -> new Date(-655866700000 + 31556940400 * (year-1949) ) shunbun = (year) -> date = shunbunWithTime(year) jDate(year, getJMonth(date), getJDate(date)) # 年を与えると秋分の日を返す shubunWithTime = (year) -> if day = { 1603: 23, 2074: 23, 2355: 23, 2384: 22 }[year] jDate(year, 9-1, day) else new Date(-671316910000 + 31556910000 * (year-1948) ) shubun = (year) -> date = shubunWithTime(year) jDate(year, getJMonth(date), getJDate(date)) ### 休日定義 https://ja.wikipedia.org/wiki/%E5%9B%BD%E6%B0%91%E3%81%AE%E7%A5%9D%E6%97%A5 ### definition = [ [ "元日", simpleHoliday( 1, 1), 1949 ], [ "成人の日", simpleHoliday( 1, 15), 1949, 1999 ], [ "成人の日", happyMonday( 1, 2), 2000 ], [ "建国記念の日", simpleHoliday( 2, 11), 1967 ], [ "天皇誕生日", simpleHoliday( 2, 23), 2020 ], [ "昭和天皇の大喪の礼", simpleHoliday( 2, 24), 1989, 1989 ], [ "春分の日", shunbun, 1949 ], [ "皇太子明仁親王の結婚の儀", simpleHoliday( 4, 10), 1959, 1959 ], [ "天皇誕生日", simpleHoliday( 4, 29), 1949, 1988 ], [ "みどりの日", simpleHoliday( 4, 29), 1989, 2006 ], [ "昭和の日", simpleHoliday( 4, 29), 2007 ], [ "即位の日", simpleHoliday( 5, 1), 2019, 2019 ], [ "憲法記念日", simpleHoliday( 5, 3), 1949 ], [ "みどりの日", simpleHoliday( 5, 4), 2007 ], [ "こどもの日", simpleHoliday( 5, 5), 1949 ], [ "皇太子徳仁親王の結婚の儀", simpleHoliday( 6, 9), 1993, 1993 ], [ "海の日", simpleHoliday( 7, 20), 1996, 2002 ], [ "海の日", happyMonday( 7, 3), 2003, 2019 ], [ "海の日", simpleHoliday( 7, 23), 2020, 2020 ], [ "海の日", simpleHoliday( 7, 22), 2021, 2021 ], [ "海の日", happyMonday( 7, 3), 2022 ], [ "山の日", simpleHoliday( 8, 11), 2016, 2019 ], [ "山の日", simpleHoliday( 8, 10), 2020, 2020 ], [ "山の日", simpleHoliday( 8, 8), 2021, 2021 ], [ "山の日", simpleHoliday( 8, 11), 2022 ], [ "敬老の日", simpleHoliday( 9, 15), 1966, 2002 ], [ "敬老の日", happyMonday( 9, 3), 2003 ], [ "秋分の日", shubun, 1948 ], [ "体育の日", simpleHoliday(10, 10), 1966, 1999 ], [ "体育の日", happyMonday( 10, 2), 2000, 2019 ], [ "スポーツの日", simpleHoliday( 7, 24), 2020, 2020 ], [ "スポーツの日", simpleHoliday( 7, 23), 2021, 2021 ], [ "スポーツの日", happyMonday( 10, 2), 2022 ], [ "即位礼正殿の儀", simpleHoliday(10, 22), 2019, 2019 ], [ "文化の日", simpleHoliday(11, 3), 1948 ], [ "即位礼正殿の儀", simpleHoliday(11, 12), 1990, 1990 ], [ "勤労感謝の日", simpleHoliday(11, 23), 1948 ], [ "天皇誕生日", simpleHoliday(12, 23), 1989, 2018 ], ] # 休日を与えるとその振替休日を返す # 振り替え休日がなければ null を返す furikaeHoliday = (holiday) -> # 振替休日制度制定前 または 日曜日でない場合 振り替え無し sunday = 0 if holiday < jDate(1973, 4-1, 30-1) or getJDay(holiday) != sunday return null # 日曜日なので一日ずらす furikae = shiftDate(holiday, 0, 0, 1) # ずらした月曜日が休日でなければ振替休日 if !isHolidayAt(furikae, false) return furikae # 旧振り替え制度では１日以上ずらさない if holiday < jDate(2007, 1-1, 1) return null # たぶんこれに該当する日はないはず？ loop # 振り替えた結果が休日だったら１日ずつずらす furikae = shiftDate(furikae, 0, 0, 1) if !isHolidayAt(furikae, false) return furikae # 休日を与えると、翌日が国民の休日かどうかを判定して、 # 国民の休日であればその日を返す kokuminHoliday = (holiday) -> if getJFullYear(holiday) < 1988 # 制定前 return null # ２日後が振り替え以外の祝日か if !isHolidayAt(shiftDate(holiday, 0, 0, 2), false) return null sunday = 0 monday = 1 kokumin = shiftDate(holiday, 0, 0, 1) if isHolidayAt(kokumin, false) or # 次の日が祝日 getJDay(kokumin)==sunday or # 次の日が日曜 getJDay(kokumin)==monday # 次の日が月曜（振替休日になる） return null return kokumin # 計算結果をキャッシュする # # holidays[furikae] = { # 1999: # "1,1": "元旦" # "1,15": "成人の日" # ... # } # holidays = { true: {}, false: {} } getHolidaysOf = (y, furikae) -> # キャッシュされていればそれを返す furikae = if !furikae? or furikae then true else false cache = holidays[furikae][y] return cache if cache? # されてなければ計算してキャッシュ # 振替休日を計算するには振替休日以外の休日が計算されて # いないとダメなので、先に計算する wo_furikae = {} for entry in definition continue if entry[2]? && y < entry[2] # 制定年以前 continue if entry[3]? && entry[3] < y # 廃止年以降 holiday = entry[1](y) # 休日を計算 continue unless holiday? # 無効であれば無視 m = getJMonth(holiday) + 1 # 結果を登録 d = getJDate(holiday) wo_furikae[ [m,d] ] = entry[0] holidays[false][y] = wo_furikae # 国民の休日を追加する kokuminHolidays = [] for month_day of wo_furikae month_day = month_day.split(",") holiday = kokuminHoliday( jDate(y, month_day[0]-1, month_day[1] ) ) if holiday? m = getJMonth(holiday) + 1 # 結果を登録 d = getJDate(holiday) kokuminHolidays.push([m,d]) for holiday in kokuminHolidays wo_furikae[holiday] = "国民の休日" # 振替休日を追加する w_furikae = {} for month_day, name of wo_furikae w_furikae[month_day] = name month_day = month_day.split(",") holiday = furikaeHoliday( jDate(y, month_day[0]-1, month_day[1] ) ) if holiday? m = getJMonth(holiday) + 1 # 結果を登録 d = getJDate(holiday) w_furikae[ [m,d] ] = "振替休日" holidays[true][y] = w_furikae # 結果を登録 return holidays[furikae][y] ### クラス定義 ### target = (module?.exports ? this.JapaneseHolidays={}) target.getHolidaysOf = (y, furikae) -> # データを整形する result = [] for month_day, name of getHolidaysOf(y, furikae) result.push( month : parseInt(month_day.split(",")[0]) date : parseInt(month_day.split(",")[1]) name : name ) # 日付順に並べ直す result.sort( (a,b)-> (a.month-b.month) or (a.date-b.date) ) result isHoliday = (date, furikae) -> getHolidaysOf(date.getFullYear(), furikae)[ [date.getMonth()+1, date.getDate()] ] isHolidayAt = (date, furikae) -> getHolidaysOf(getJFullYear(date), furikae)[ [getJMonth(date)+1, getJDate(date)] ] target.isHoliday = isHoliday target.isHolidayAt = isHolidayAt target.shiftDate = shiftDate target.u2j = u2j target.j2u = j2u target.jDate = jDate target.uDate = uDate target.getJDay = getJDay target.getJDate = getJDate target.getJMonth = getJMonth target.getJFullYear = getJFullYear target.getJHours = getJHours target.getJMinutes = getJMinutes target.__forTest = { shunbunWithTime: shunbunWithTime shubunWithTime: shubunWithTime }