This function calculates the number of days from the beginning of the coupon period to the settlement date.
COUPDAYBS(settlement, maturity, frequency, basis)
This function has these arguments:
Settlement date for the security
Maturity date for the security
Frequency of payment, number of coupon payments per year; must be 1, 2, or 4
[Optional] Integer representing the basis for day count (Refer to Day Count Basis.)
This function returns an error if settlement or maturity is invalid (#VALUE!), or if frequency is a number other than 1, 2, or 4 (#NUM!). All arguments are truncated to integers.
If basis is greater than 4 or less than 0, a #NUM! error is returned.
If settlement is greater than or equal to maturity, a #NUM! error is returned.
Accepts numeric and DateTime object data. Returns numeric data.