require 'date' require File.expand_path('../shared/commercial', __FILE__) describe "Date#commercial" do it_behaves_like(:date_commercial, :commercial) end # reference: # October 1582 (the Gregorian calendar, Civil Date) # S M Tu W Th F S # 1 2 3 4 15 16 # 17 18 19 20 21 22 23 # 24 25 26 27 28 29 30 # 31