How to Use Date Formula in Excel. In the formula A2 is the start date B2 is the days you want to add. Select the blank cell you will place the calculating result type the formula DATE YEAR A26MONTH A2DAY A2 and press the Enter key.
The result is the same as the first formula.
A1 100. The formula in cell B2 adds a date in cell A2 with number 20. While working or calculating dates in excel one should know the Date function. There are many ways to get a date value for the first formula the date value is inserted in a cell the second formula uses the DATE function then added to the number 20.