日期之間的範圍
require 'date'
date1 = Date.parse "01/06/2016"
date2 = Date.parse "05/06/2016"
p "Period #{date1.strftime("%d/%m/%Y")} to #{date2.strftime("%d/%m/%Y")}"
(date1..date2).each do |date|
p date.strftime("%d/%m/%Y")
end
# "01/06/2016"
# "02/06/2016"
# "03/06/2016"
# "04/06/2016"
# "05/06/2016"