Date.commercial([cwyear=-4712[, cweek=1[, cwday=1[, start=Date::ITALY]]]]) â date
Class Public methods
Creates a date object denoting the given week date.
The week and the day of week should be a negative or a positive number (as
a relative week/day from the end of year/week when negative). They should
not be zero.
Date.commercial(2001) #=> #<Date: 2001-01-01 ...>
Date.commercial(2002) #=> #<Date: 2001-12-31 ...>
Date.commercial(2001,5,6) #=> #<D