If you need to calculate the difference between two dates, go to the Difference tab. There you will see three boxes to fill in: Date 1, Date 2 and Difference in. Unlike the Excel DATEDIFF function, our Date & Time Formula Wizard does not care about the order of the dates (start date and end date), it can output the result as a positive or negative number. After entering the dates, you select a format.
For instance, you can calculate the number of days between two dates; or show the difference in years, weeks and months; or weeks and days; etc. Once you click the Insert Formula button, the formula displayed in the Formula result section is inserted in the selected cell.