If you take a lot of pictures while travelling, you will come across the timezone issue sooner or later. What would you set your camera’s clock to? UTC? Local timezone? Local timezone plus Daylight Saving Time? Even if you opt for UTC – like I do – you would still want to have some reference to local time.
Unfortunately, there is a big metadata issue, due to the fact that the predominant EXIF standard does not provide for timezones in the timestamp tags. This may get particularly confusing if your workflow includes geotagging. Here is a suggestion how to set up a workaround using ExifTool and Automator.