def start_of_week(year, month, week)
      retail_calendar.start_of_week(year, julian_to_merch(month), week)
    end
def start_of_week(year, month, week)
      retail_calendar.start_of_week(year, julian_to_merch(month), week)
    end
The start date of the week

 @param year [Integer] the merch year
 @param month [Integer] an integer specifying the julian month.
 @param week [Integer] an integer specifying the merch week.

 @return [Date] the starting date of the specified week