YEARFRAC function

Calculates the fraction of the year represented by the number of whole days between two dates (the start_date and the end_date). Use the YEARFRAC worksheet function to identify the proportion of a whole year's benefits or obligations to assign to a specific term.

Syntax

YEARFRAC(start_date,end_date,basis)

 Important   Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

Start_date     is a date that represents the start date.

End_date     is a date that represents the end date.

Basis     is the type of day count basis to use.

Basis Day count basis
0 or omitted US (NASD) 30/360
1 Actual/actual
2 Actual/360
3 Actual/365
4 European 30/360


Remarks

  • Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900. Microsoft Excel for the Macintosh uses a different date system as its default.
  • All arguments are truncated to integers.
  • If start_date or end_date are not valid dates, YEARFRAC returns the #VALUE! error value.
  • If basis < 0 or if basis > 4, YEARFRAC returns the #NUM! error value.

Example

The example may be easier to understand if you copy it to a blank worksheet.

ShowHow to copy an example

  • Create a blank workbook or worksheet.
  • Select the example in the Help topic.

 Note   Do not select the row or column headers.

Selecting an example from Help

Selecting an example from Help
  • Press CTRL+C.
  • In the worksheet, select cell A1, and press CTRL+V.
  • To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
 
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A B
Data Description
1/1/2007 Start date
7/30/2007 End date
2 Actual/360 (see above)
Formula Description (Result)
=YEARFRAC(A2,A3,A4) Fraction of the year between the two dates (0.583333333)
 
 
Applies to:
Excel 2007