Workday
Returns the date after a specified number of working days from the start date.
【startDate】is the specified start date.
【numDays】is the number of working days after the start date, represented by a positive number. For example, the number "1" represents the date one working day after the start date, see example one;
【holidays】optional. These are specific dates to be excluded from the calendar, such as holidays. The input format is "yyyy-mm-dd", with multiple dates separated by commas, see example three.
This function does not include weekends and the specific dates you specify.