How to Calculate Working Days in Excel & Exclude ANY Days you WANT (weekends too)
How to Reset Week Number Every Month in Excel - (WEEKDAY & WEEKNUM Functions Explained)
Excelを使って各月の営業日数を計算する
月の土曜日の数を数える - 5つの異なる数式! - Excelマジックトリック1587
Excelの日付関数で月内のN番目の曜日を見つける
AutoFill Only Weekdays in Excel (2 Quick Ways)
Date Formulas in Excel | Extract the year, weekday, Month and week number from any date in Excel.
Working with Dates in Excel: How to count the number of days in a month?
Excelで2つの日付間の営業日数を計算する(週末と祝日を除く)