Last year I was able to change the system time by using a feature code on a handset. I cannot remember how I did it and am unable to find the instructions.
As senk1s says, use the browser. You can change it from a phone, but it will not last because the telephony side is sampling the time from the BIOS setting. Once it goes out to update telephony time from the Bios time, it will revert back to the un-updated Bios time. UM updates the BIOS time.
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