Accrued Prd

Function Accrued Prd within Bond with keys Bond Accrued Prd keysreturns the accrued period of the referenced bond at a given reference date Tˢ
Several values may be also returned here in the form of a 1D-array
This equals the number of calendar days from the start of the accrual period containing Tˢ until Tˢ expressed in annual units according to the bond's day count convention.

If the settlement date Tˢ is not explicitly given, it will be set to the bond's settlement date as implied by a trade transaction assumed to occur on the trade dateT₀ (typically today).