Clock Reset When Connected

I need some help with an issue I have been having for a while. When I have the laptop hooked up to the truck (2001 Silverado), the clock will reset when I start the truck.

I noticed today that the clock reset to 01:00, where I would have assumed that a normal clock reset (like disconnecting battery) would reset it to 12:00. This is the first time that I have noticed it reset to 01:00, but can't honestly say I have been paying that much attention to what it would change to in the past.

Any ideas about what could be going on? Thanks