Japanese holiday and business-day calculations using official Japan Cabinet Office data.
Scored across 4 tools
Each tool targets a distinct operation: adding business days, counting business days between dates, checking a single holiday, and listing holidays for a period. The only mild overlap is is_holiday versus list_holidays and the note that add_business_days with days=0 yields the same info as is_holiday, but the descriptions explicitly clarify boundaries.
Names mix conventions: verb_noun (add_business_days, list_holidays), a noun phrase (business_days_between), and an is_noun predicate (is_holiday). All are snake_case and readable, but there's no single predictable pattern across the set.
Four tools is reasonable for a narrow Japanese business-day/holiday domain, with each tool covering a distinct need. It is on the lighter side, but nothing feels redundant or missing for the core purpose.
The surface covers holiday lookup, single-date holiday checks, business-day counting, and business-day arithmetic with weekend/holiday/banking exclusion. Minor gaps remain (e.g. explicit business-day predicate or era/wareki handling implied by 'Japanese Calendar'), but core workflows are complete.
指定した日付(date)の翌日から数えてN営業日目(days)の日付を返します。dateの当日は数えません。daysが負の場合は過去方向（dateの前日から遡ってN営業日目）に計算します。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。dateが営業日かどうかだけ知りたい場合は is_holiday を使ってください（days=0でも同じ情報がskipped経由で得られます）。入力例: {"date": "2026-07-10", "days": 3}
Inputs: date (required), days (required), calendar, extra_closed_dates.
from〜to間の営業日数を数えます。既定では「fromを含まず、toを含む」境界です（例:「今日から支払期日まで何営業日か」）。include_from/include_toで境界を変更できます。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。from > to の場合はエラーにせず、from/toとinclude_from/include_toを入れ替えて計算した結果の符号を反転した値（負の営業日数）を返します（反対称則: count(A,B,x,y) = -count(B,A,y,x)。A≠B、すなわちfrom≠toの場合に成立する恒等式で、from===toはこの分岐に入らないため対象外）。入力例: {"from": "2026-07-10", "to": "2026-07-20"}
Inputs: to (required), from (required), calendar, include_to, +2 more.
指定した日付が日本の祝日（国民の祝日・休日）かどうかを判定します。内閣府公表データに基づきます。入力例: {"date": "2026-01-01"}
Inputs: date (required).
指定した年または期間の日本の祝日一覧を返します。入力例: {"year": 2026} または {"from": "2026-01-01", "to": "2026-06-30"}year は数値（例: 2026。文字列の "2026" は不可）。from/to は YYYY-MM-DD の実在日のみ（例: "2026-01-01"。2026/01/01・20260101 は不可）。year と from/to は併用不可。
Inputs: to, from, year.
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Japan business days & holidays (official Cabinet Office data). Free tool + x402 USDC paid tools.
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