Returns the number of days in the coupon period that contains the settlement date.
| Name | Type | Description |
| arg1 | any | Is the security's settlement date, expressed as a serial date number. |
| arg2 | any | Is the security's maturity date, expressed as a serial date number. |
| arg3 | any | Is the number of coupon payments per year. |
| arg4 | any | Is the type of day count basis to use. |
builder.CreateFile("xlsx");
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.COUPDAYS("1/10/2018", "6/15/2019", 4, 1));
builder.SaveFile("xlsx", "COUPDAYS.xlsx");
builder.CloseFile();