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.

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.

» 1 related article
» 3 related functions

Examples

--  DATEDIFF computes the delta between two dates, using different units of measure
--  YEAFRAC returns the delta as a fraction (in years) 
EVALUATE
VAR StartDate =  DATE ( 2011, 01, 01 )
VAR EndDate =    DATE ( 2012, 12, 15 )
RETURN
    { 
        ( "DATEDIFF Year",     DATEDIFF ( StartDate, EndDate, YEAR ) ),
        ( "DATEDIFF Quarter",  DATEDIFF ( StartDate, EndDate, QUARTER ) ),
        ( "DATEDIFF Month",    DATEDIFF ( StartDate, EndDate, MONTH ) ),
        ( "DATEDIFF Day",      DATEDIFF ( StartDate, EndDate, DAY ) ),
        ( "Subtraction",       INT ( EndDate - StartDate ) ),
        ( "YEARFRAC",          YEARFRAC ( StartDate, EndDate ) )
    }    
Value1 Value2
DATEDIFF Year 1.00
DATEDIFF Quarter 7.00
DATEDIFF Month 23.00
DATEDIFF Day 714.00
Subtraction 714.00
YEARFRAC 1.96
--  The default of YEARFRAC is "US 30/360"
EVALUATE
VAR StartDate =  DATE ( 2010, 01, 01 )
VAR EndDate =    DATE ( 2011, 12, 15 )
RETURN
    { 
        ( "YEARFRAC",       YEARFRAC ( StartDate, EndDate ) ),
        ( "Number of days", INT ( EndDate - StartDate ) ),
        ( "YEARFRAC *365",  YEARFRAC ( StartDate, EndDate ) * 365 )
    }  
Value1 Value2
YEARFRAC 1.96
Number of days 713.00
YEARFRAC *365 713.78
--  Different standards produce different fractions
--  YEAFRAC is intended as a financial function, following the required
--  standard of 30/360.
EVALUATE
VAR StartDate =  DATE ( 2011, 01, 01 )
VAR EndDate =    DATE ( 2011, 12, 15 )
RETURN
    { 
        ( "YEARFRAC US 30/360",       FORMAT ( YEARFRAC ( StartDate, EndDate, 0 ), "0.0000" ) ),
        ( "YEARFRAC Actual / Actual", FORMAT ( YEARFRAC ( StartDate, EndDate, 1 ), "0.0000" ) ),
        ( "YEARFRAC Actual / 360",    FORMAT ( YEARFRAC ( StartDate, EndDate, 2 ), "0.0000" ) ),
        ( "YEARFRAC Actual / 365",    FORMAT ( YEARFRAC ( StartDate, EndDate, 3 ), "0.0000" ) ),
        ( "YEARFRAC EU 30/360",       FORMAT ( YEARFRAC ( StartDate, EndDate, 4 ), "0.0000" ) )
    }    
Value1 Value2
YEARFRAC US 30/360 0.9556
YEARFRAC Actual / Actual 0.9534
YEARFRAC Actual / 360 0.9667
YEARFRAC Actual / 365 0.9534
YEARFRAC EU 30/360 0.9556

Related articles

Learn more about YEARFRAC in the following articles:

Related functions

Other related functions are:

Last update: Jul 23, 2021   » Contribute   » Show contributors

Contributors: Alberto Ferrari, Marco Russo

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

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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.

Iterator

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.

Deprecated

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

Deprecated

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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