To calculate the number of years between two dates, you can use the YEARFRAC function, which will return a decimal number representing the fraction of a year between two dates. In the example shown, the formula in D6 is:
If you need to calculate years on an ongoing basis, for example to get age based on a birthday, see the example here.
Note: The YEARFRAC function has an optional 3rd argument that controls how days are counted when computing fractional years. The default behavior is to count days between two dates based on a 360-day year, where all 12 months are considered to have 30 days. The YEARFRAC page provides more information.
The DATEDIF function (Date + Dif) is a bit of an anomaly in Excel. A compatibility function that comes originally from Lotus 1-2-3, Excel will not help supply arguments when the function is entered. However, DATEDIF works in all modern versions of...
The Excel INT function returns the integer part of a decimal number by rounding down to the integer. Note that negative numbers become more negative. For example, while INT(10.8) returns 10, INT(-10.8) returns -11.
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