sync clock on PC with time on internet

ntp does it. YOur clock may be unaffected because it is so far out, ntp refuses to change it. Timezone in Linux is handled by the various time programs. The time on a Linux system is always in UTC. (the hardwar clock may not be, but the system time always is) and it is that time that ntp changes. It updates as often as is needed. Once it hasfigured out the rate error in your system clock it will go less often.

etc-ntp.conf is where you set the various parameters.

If you switch off your system often, chrony is a better program. It can also keep track of the hardware (rtc) clock and on bootup correct for its errors. Unfortunately Linux is in transition in handling the rtc clock. There is a new timer chip being introduced in hardware which is incompatible with the old timer chip, and the rtc routines may be bad. For example in Mandrake 10.1 the kernel options destroyed the rtc module, but the genrtc module works. Thus at present chrony and Linux have a somewhat unstable relationship. This should settle down in the next few months, I hope. Thereafter chrony should again be the prefered option.