For both the above replys please check the settings , there is a summer time setting ... if going abroad then you have to select the country , not sure if that applys to all pcms though
Im afraid im a little weak on all the different PCM,s and the different settings .. to be honest i either look at the pcm and figure it out or read the manual.
All i can say is the GPS will get the time after about 30 seconds and set the clock , not sure if you can turn this function off but i suspect you can .