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特定の日付からn営業日分の配列を返す関数
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| // 適当タイムゾーン | |
| const Timezone = { | |
| "Africa/Johannesburg": 2, | |
| "Africa/Lagos": 1, | |
| "Africa/Windhoek": 1, | |
| "America/Adak": -10, | |
| "America/Anchorage": -9, | |
| "America/Argentina/Buenos_Aires": -3, | |
| "America/Bogota": -5, | |
| "America/Caracas": -4.5, | |
| "America/Chicago": -6, | |
| "America/Denver": -7, | |
| "America/Godthab": -3, | |
| "America/Guatemala": -6, | |
| "America/Halifax": -4, | |
| "America/Los_Angeles": -8, | |
| "America/Montevideo": -3, | |
| "America/New_York": -5, | |
| "America/Noronha": -2, | |
| "America/Phoenix": -7, | |
| "America/Santiago": -4, | |
| "America/Santo_Domingo": -4, | |
| "America/St_Johns": -3.5, | |
| "Asia/Baghdad": 3, | |
| "Asia/Baku": 4, | |
| "Asia/Beirut": 2, | |
| "Asia/Dhaka": 6, | |
| "Asia/Dubai": 4, | |
| "Asia/Irkutsk": 9, | |
| "Asia/Jakarta": 7, | |
| "Asia/Kabul": 4.5, | |
| "Asia/Kamchatka": 12, | |
| "Asia/Karachi": 5, | |
| "Asia/Kathmandu": 5.75, | |
| "Asia/Kolkata": 5.5, | |
| "Asia/Krasnoyarsk": 8, | |
| "Asia/Omsk": 7, | |
| "Asia/Rangoon": 6.5, | |
| "Asia/Shanghai": 8, | |
| "Asia/Tehran": 3.5, | |
| "Asia/Tokyo": 9, | |
| "Asia/Vladivostok": 11, | |
| "Asia/Yakutsk": 10, | |
| "Asia/Yekaterinburg": 6, | |
| "Atlantic/Azores": -1, | |
| "Atlantic/Cape_Verde": -1, | |
| "Australia/Adelaide": 9.5, | |
| "Australia/Brisbane": 10, | |
| "Australia/Darwin": 9.5, | |
| "Australia/Eucla": 8.75, | |
| "Australia/Lord_Howe": 10.5, | |
| "Australia/Sydney": 10, | |
| "Etc/GMT+12": -12, | |
| "Europe/Berlin": 1, | |
| "Europe/London": 0, | |
| "Europe/Moscow": 4, | |
| "Pacific/Apia": 13, | |
| "Pacific/Auckland": 12, | |
| "Pacific/Chatham": 12.75, | |
| "Pacific/Easter": -6, | |
| "Pacific/Gambier": -9, | |
| "Pacific/Honolulu": -10, | |
| "Pacific/Kiritimati": 14, | |
| "Pacific/Majuro": 12, | |
| "Pacific/Marquesas": -9.5, | |
| "Pacific/Norfolk": 11.5, | |
| "Pacific/Noumea": 11, | |
| "Pacific/Pago_Pago": -11, | |
| "Pacific/Pitcairn": -8, | |
| "Pacific/Tongatapu": 13, | |
| "UTC": 0, | |
| } as const; | |
| enum DayOfWeek { | |
| SUNDAY=0, | |
| SATURDAY=6 | |
| } | |
| type Direction = 'before' | 'after' | |
| const initDates = (initial: Date[], baseDate: Date, length: number, direction: Direction): Date[] => { | |
| const copiedDates = [...initial]; | |
| const copiedBaseDate = new Date(baseDate); | |
| // 日付だけ考慮したいので時間を0に設定する | |
| copiedBaseDate.setHours(0, 0, 0, 0) | |
| for (let i = 1; i <= length - (initial.length); i++) { | |
| const diffTime = 1000 * 60 * 60 * 24 * i; | |
| copiedDates.push(new Date(copiedBaseDate.getTime() - (direction === 'before' ? diffTime : -diffTime))) | |
| } | |
| return copiedDates; | |
| } | |
| /** | |
| * 指定の日から n 営業日(後|前)までの日付のリストを返却する。 | |
| * | |
| * @param daysCount 数える日数 | |
| * @param baseDate 基準の日時 | |
| * @param direction n日前，n日後 | |
| * @param options その他の設定 | |
| * @returns 日付のリスト | |
| */ | |
| const calc = ( | |
| daysCount: number, | |
| baseDate: Date, | |
| direction: Direction, | |
| options: { | |
| timezone?: keyof typeof Timezone; | |
| customs?: Date[]; | |
| initialValue?: Date[]; | |
| } | |
| ): Date[] => { | |
| const { timezone, customs, initialValue } = options; | |
| const dates = initDates(initialValue ?? [], baseDate, daysCount, direction); | |
| const mostOldDate = dates[dates.length - 1] | |
| // リストの操作をForで行うので，Forで回すリストと実際に操作するリストを分離する。 | |
| const copiedDates = [...dates] | |
| for (const date of copiedDates) { | |
| // タイムゾーンを考慮した時間に変更する | |
| const zoned = new Date(date.getTime() + 1000 * 60 * 60 * Timezone[timezone || 'UTC']) | |
| // 休日，またはカスタムの休日に該当する日をリストから除外する | |
| if ([DayOfWeek.SUNDAY, DayOfWeek.SATURDAY].includes(zoned.getDay())) { | |
| dates.splice(dates.indexOf(date), 1) | |
| } else if (customs?.some(custom => { | |
| const zonedCustom = new Date(custom.getTime() - 1000 * 60 * 60 * Timezone[timezone || 'UTC']) | |
| return zonedCustom.getTime() === date.getTime() | |
| })) { | |
| dates.splice(dates.indexOf(date), 1) | |
| } | |
| } | |
| // 求める日数と同じであれば返却し，そうでなければ処理を続行する | |
| if (dates.length === daysCount) { | |
| return dates; | |
| } | |
| return calc( | |
| daysCount, | |
| mostOldDate, | |
| direction, | |
| { | |
| customs: customs, | |
| timezone: timezone, | |
| initialValue: dates | |
| } | |
| ) | |
| } | |
| // 今日 | |
| const result = calc(7, new Date(), 'after', { | |
| // 休日にしたい日付の配列。時間は指定のtimezoneで解釈される。 | |
| customs: [new Date('2024-01-25')], | |
| timezone: 'Asia/Tokyo' | |
| }) | |
| console.log(result.map(date => date.toLocaleString())) |
やったわよ
n営業日後も出せるようにした。
全タイムゾーンに対応（笑）
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タイムゾーンを渡すと曜日計算と
customがタイムゾーン考慮になるようにすると良さそうわね。