A monkey patch to check for the next business day in X number of days.

time.rb

class Time
  def in_business_days(number_of_days)
    result = self.in number_of_days.days
    while [0,6].include?(result.wday) || result.to_date.holiday?(:us)
      result += 1.day
    end
    result
  end
end

time_spec.rb

require 'spec_helper'
describe Time do
  describe "#in_business_days" do
    it "should return June 30 for 3 business days from June 27 " do
      actual = Time.parse("2011-06-27").in_business_days 3
      actual.should == Time.parse("2011-06-30")
    end
    
    it "should return June 27 for 3 business days from June 22" do
      actual = Time.parse("2011-06-22").in_business_days 3
      actual.should == Time.parse("2011-06-27")
    end
    
    it "should return July 5 for 3 business days from June 29 (accounting for July 4 holiday)" do
      actual = Time.parse("2011-06-29").in_business_days 3
      actual.should == Time.parse("2011-07-05")
    end
  end
end