the ISDA convention, also known as "Actual/Actual (Historical)",
"Actual/Actual", "Act/Act", and according to ISDA also "Actual/365",
"Act/365", and "A/365";
the ISMA and US Treasury convention, also known as
"Actual/Actual (Bond)";
the AFB convention, also known as "Actual/Actual (Euro)".
Actual/Actual day count
The day count can be calculated according to:
the ISDA convention, also known as "Actual/Actual (Historical)", "Actual/Actual", "Act/Act", and according to ISDA also "Actual/365", "Act/365", and "A/365";
the ISMA and US Treasury convention, also known as "Actual/Actual (Bond)";
the AFB convention, also known as "Actual/Actual (Euro)".
For more details, refer to http://www.isda.org/publications/pdf/Day-Count-Fracation1999.pdf
test the correctness of the results is checked against known good values.