Not sure if this is related but I just had one switch to UTC. In the GUI it's set to Pacific
and in the command line doing Date provides the correct time
but in the GUI it shows UTC.
And yes, I did reboot the system (and for the heck of it restart the ntpd service), and no the time zone has never been changed.
PBX Firmware: 10.13.66-6
FreePBX 13.0.38