…set your cameras’ clocks (all your cameras’ clocks) to winter time?
That is, if you live in Europe or North America or some other place where we use Summer and Winter time.
If you do, and you have not yet corrected your cameras’ time, then do it now. Otherwise your EXIF data will be wrong all winter. (Or summer if you live down under, but I do not want to hear about that).
PC’s (and I’m sure Macs) can adjust for DST automatically. Surely it would not be hard to program the rules into a camera’s firmware.
It would not, but this will never happen as long as the Japanese hardware manufacturers are the people who program their cameras.