Where may I find documentation for the Day Count Convention actual/actual (basis value 0) from the Financial Toolbox

Where may I find documentation for the Day Count Convention actual/actual (basis value 0 that is the default) from the Financial ToolBox? Cannot understand how the denominator is calculated. For example:

yearfrac('1 feb 2019', '1 apr 2020', 0) = (365+60)/365
yearfrac('1 mar 2019', '1 apr 2020', 0) = (366+31)/366

Thanks in advance!

Answer 1

[Cris LaPierre]

I believe it's described on the yearfrac documentation page. An explanation of the basis input is found here.

[Antonio Seabra]

Thank you very much!