# YEARFRAC Function

The YEARFRAC function is one of the date and time functions. It is used to return the fraction of a year represented by the number of whole days from start-date to end-date calculated on the specified basis.

The YEARFRAC function syntax is:

YEARFRAC(start-date, end-date [,basis])

where

start-date is a number representing the first date of the period, entered using the Date function or other date and time function.

end-date is a number representing the last date of the period, entered using the Date function or other date and time function.

basis is the day count basis to use, a numeric value greater than or equal to 0, but less than or equal to 4. It can be one of the following:

Numeric value | Count basis
0 | US (NASD) 30/360
1 | Actual/actual
2 | Actual/360
3 | Actual/365
4 | European 30/360

Note: if the start-date, end-date or basis is a decimal value, the function will ignore the numbers to the right of the decimal point.

To apply the YEARFRAC function,

1. select the cell where you wish to display the result,
2. click the Insert function icon situated at the top toolbar,
   or right-click within a selected cell and select the Insert Function option from the menu,
   or click the icon situated at the formula bar,
3. select the Date and time function group from the list,
4. click the YEARFRAC function,
5. enter the required arguments separating them by commas,
6. press the Enter button.

The result will be displayed in the selected cell.