# Is the ACT/ACT.AFB convention meant to supersede the ACT/ACT convention for interest rate swaps

https://www.isda.org/a/pIJEE/The-Actual-Actual-Day-Count-Fraction-1999.pdf

The determination of day counts are slightly diferrent between ACT/ACT (ISDA) and ACT/ACT(AFB).

Is the latter more common or meant to supercede the former? I'm talking just for interest rate swaps.