Most cameras that I've seen (especially idiot boxes) can't be trusted to have their clocks set to the current month, much less the correct time zone.
There's a photographer that I know who often cares about the exact time a picture was taken (professional building shots, relying on sun angles). He first takes a picture of his GPS so, if things look weird, he can figure out the correction.
Anyhow point is, unless the camera is running NTP or a GPS receiver, I wouldn't put much weight in EXIF data!