gistfile1.rb

# Usage: Date.today.weekdays_until(some_date_in_the_future)

class Date
  def weekdays_until(date)
    return 0 if date <= self
    (self..date).select{|day| day.is_weekday?}.size
  end

  def is_weekday?
    self.wday != 0 && self.wday != 6
  end

end