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.
Date
An array of holidays may be given by enclosing them in braces, such as {"12/25/2004","12/31/2004"}
.
workday(date(2011,12,13),-6)
returns 12/5/2011