Fixing (some) photo timestamps in a folder

Having just gotten back from a vacation with 2 different cameras along, I was dismayed to learn that they didn’t agree on the date - a 10h difference! The end result was a strange and disconcerting time-travelling slideshow - something had to be done! I rolled up my sleeves, got ready to write a long and complex perl script to fix the timestamps, and shortly discovered that the solution is a one-liner using exiftool (which does use Perl under the hood).

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