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
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