1] Add days directly If the expiry period is defined in days, you can calculate the expiry date by simply adding the number of days to the starting date using the + operator.

How to Calculate Hours in Excel Excluding Weekends. An Excel spreadsheet can become an indispensable tool for your business when you harness its power for keeping records and doing computations.

How to Calculate the Total Hours Formula in Excel. As a spreadsheet software program, Microsoft Excel has many useful features for a small business's productivity.