YEARFRAC DAX Function (Date and Time)

Returns the year fraction representing the number of whole days between start_date and end_date.

Syntax

YEARFRAC ( <StartDate>, <EndDate> [, <Basis>] )

Parameter	Attributes	Description
StartDate		The start date in datetime format.
EndDate		The end date in datetime format.
Basis	Optional	The type of day count basis to use. 0 (default) : US (NASD) 30/360 1 : Actual/actual 2 : Actual/360 3 : Actual/365 4 : European 30/360

Return values

Scalar A single decimal value.

Fraction of the year.

Remarks

If the argument is a string, it is translated into a datetime value using the same rules applied by the DATEVALUE function.

Examples

YEARFRAC can be used to compute the current age of a customer based on the difference between the current day and the customer‘s birthdate, but because of a bug it is suggested to use another technique (also faster) based on quotient and floor, as described in related content.

Learn more about YEARFRAC in the following articles:

Correct calculate of age in DAX from birthday

Consider alternative to YEARFRAC in order to get the right age based on birthday because of bugs in YEARFRAC. » Read more

Related functions

Other related functions are:

Last update: Dec 21, 2019 » Contribute » Show contributors

Contributors: Alberto Ferrari, Marco Russo

MSDN documentation: https://docs.microsoft.com/en-us/dax/yearfrac-function-dax