Function coupdaybs

coupdaybs(
    settlement: Date,
    maturity: Date,
    frequency: 1 | 2 | 4,
    basis?: 0 | 1 | 2 | 4 | 3,
): number
Returns the number of days from the beginning of the coupon period to the settlement date.

Remarks:
- settlement, maturity, frequency, and basis are truncated to integers.
- If settlement or maturity is not a valid date, an error is thrown.
- If frequency is any number other than 1, 2, or 4, an error is thrown.
- If basis < 0 or if basis > 4, an error is thrown.
- If settlement >= maturity, an error is thrown.
Parameters
- settlement: Date
  The security's settlement date.
- maturity: Date
  The security's maturity date.
- frequency: 1 | 2 | 4
  The number of coupon payments per year. For annual payments, frequency = 1; for semiannual, frequency = 2; for quarterly, frequency = 4.
- Optionalbasis: 0 | 1 | 2 | 4 | 3 = 0
  The type of day count basis to use. 0 or omitted = US (NASD 30/360), 1 = actual/actual, 2 = actual/360, 3 = actual/365, 4 = European 30/360.
Returns number
The number of days from the beginning of the coupon period to the settlement date.
Example
```
coupdaybs(new Date("2011-01-25"), new Date("2011-11-15"), 2, 1); // 71
```
- Defined in coupdaybs.js:36