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how to do date calculation in excel. Use a different formula to find days. For example the start date is 8142015 in Cell A2 and the expiration period is 3 months here I will guide you to calculate the expiration date as follows.
Microsoft Excel internally stores dates as serial numbers which is the number of days a date is from Jan. Enter the date of birth into cell A2. After installing Kutools for Excel please do as follows.
In the Calculation Options section select Automatic to turn on automatic recalculation.
Select a blank cell type below formula into it and then drag the Fill Handle to the range as you need. We can change the number format to a Fraction to display the number of days. The wizard can perform the following calculations. Step 2 Create a column for current dates or starting dates.