How to Calculate Year, Month & Days Using VBA in Microsoft Excel 2010

In this article, you will learn how to calculate year, month & days. We will use VBA code to create UDF function for calculation.
Click on Developer tab

From Code group, select Visual Basic
Click on Insert, and then Module
This will create a new module.

Enter the following code in the Module

Function dDATEDIF(Start_Date As Date, End_Date As Date, Unit As String) As String

xlDATEDIF = DateDiff(Unit, Start_Date, End_Date)

End Function
The new UDF formula is created with name dDATEDIF

There are three parameters:

Start_Date: The days from which the period begins.

End_Date: It is the last date of the period that you wish to calculate.

Unit: It specifies the interval by which you want the difference. Here, the unit accepts the following values.
To find the number of days, the formula would be =dDATEDIF(A2,B2,”d”). Refer below snapshot:
To find the number of years, the formula would be =dDATEDIF(A2,B2,”yyyy”). Refer below snapshot:
To get other outputs like month, quarter, etc., refer below snapshot, which can be used as a Unit (3rd parameter), and the result will get updated.
In this way you can get to know the all the time values that you are interested in.

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