エクセルで定義された祝日リストを読み込み、パラメーターで指定された日付が祝日かを判定します。

祝日リストの読み込みは初回判定時のみ実施するため、連続して呼び出してもファイルI/Oが抑えられます。

祝日リスト.xlsxには2030年までの祝日を記載してありますが、春分の日・秋分の日は地球の運行状態によって変化する可能性があります。

新たな祝日が出来るケースもあるので、その際は自主的にアップデート下さい。

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