http://melborne.github.io/2013/02/07/understand-ruby-object/http://www.oki-osk.jp/esc/ruby/tut-05.htmlhttp://www.rubylife.jp/ini/module/index1.html

system clockapt-get install ntphttp://superuser.com/questions/123962/how-can-i-permanently-fix-my-date-synchronize-problem-in-linux - hardware clock http://askubuntu.com/questions/175452/hwclock-not-in-sync-with-system-clock http://manpage…