YEARFRAC DAX Function (Date and Time)

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


YEARFRAC ( <StartDate>, <EndDate> [, <Basis>] )
Parameter Attributes Description

The start date in datetime format.


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.


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


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.

Related articles

Learn more about YEARFRAC in the following articles:

Related functions

Other related functions are:

Last update: Feb 25, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

MSDN documentation:

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Context Transition

This function performs a Context Transition if called in a Row Context. Click to read more.

Row Context

This expression is executed in a Row Context. Click to read more.


Not recommended

The use of this function is not recommended. See Remarks and Related functions for alternatives.

Not recommended

The use of this parameter is not recommended.


This function is deprecated. Jump to the Alternatives section to see the function to use.


This parameter is deprecated and its use is not recommended.

DirectQuery compatibility

Limitations are placed on DAX expressions allowed in measures and calculated columns.
The state below shows the DirectQuery compatibility of the DAX function.


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