So I'm currently travelling in Asia at the moment and I'm also going to geotag my photos. To make things simple for myself, I've followed some people's advice and set my camera's time to match UTC time. I know that in Lightroom, I can easily change the time, but the thing is that I don't think the process is permanent. I want the changes to be saved into the NEF's EXIF header. I also want the changes to be made like as if the photo was indeed shot in that timezone. I don't want something weird to appear in the EXIF as a result of my attempt to change the time of the photo. I have well over 8000 photos on my laptop at the moment. What's a good program that can change the time in the EXIF in large batches (preferably in 100s or 1000s)?