Probably a long shot......?
Answers: Are you sure that you set the time yourself? Most phones with a clock on the display will reset themselves as soon as they receive a phone call for, as the phone company sends a time signal as part of the guest id protocol, even if you do not subscribe to tourist id. If the phone be just plugged contained by, can you call it from a cell phone, answer the ring, and after a few seconds after you hang down up the phone, the time should correct itself. If your phone is behind a pbx system, check to gross sure the clock info is correct on the pbx system.
Look here for your phone's manual
http://manual.network.sec.co.kr:7001/ems...
I have a sneaking suspicion that it's under Enterprise/Digital Keyphone System
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