Returns the date the given number of workdays before or after the given date.
workday( starting date, days, [holidays] )
starting_date: (Date) The starting date.
days: (Integer) The number of days to advance into the future (positive numbers) or days to retreat into the past (negative numbers).
holidays: (Date) A list of holidays not counted as workdays.
An array of holidays may be given by enclosing them in braces, such as
You can experiment with this function in the test box below.