某DBの日付書式をエクセル用に変換

#!/usr/bin/ruby

require 'parsedate'


f = open("target.txt")
f.each{ |line|
  day = ParseDate::parsedate(line)
  year = day[0].to_s
  month = day[1].to_s
  day = day[2].to_s

  puts year + "/" + month + "/" + day
}