To calculate the number of days between today and 04 September 2022 (which is a past date), we will use the formula =TODAY ()-A17. The function returns 24 as the resultant value.

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.

Excel makes it easy to find how many days there are between two dates. With a little more effort, you can find the number of days in which people will be actually working.