Clock issue in Ubuntu 12.10

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http://askubuntu.com – I could see that my clock does not work right. For example, now it's 15:49, and Ubuntu has 16:10. It takes the time from Internet and I don't know why change it when it wants. /etc/default/ntp it only has NTPD_OPTS='-g' I don't know what file I have to see or change. Could you help me? Thanks (HowTos)