Photoshop Elements 2023 Organiser timestamp on images

Thanks again, Michel. Re your question, my proiblem is that I have store my 'master' PE Organiser images and catalog on a external hard drive on my desktop.  This currently catalogues over 111,000 photographs, accumulated over 18 years, with a total volume size of 860GB.

I don't have space to keep anything like that number of files on my laptop when I'm travelling, so only retain relatively recent images on it. I create a new folder each time I download photos from my Nikon D7500 to the laptop; I then log them in using Organiser on my laptop.

To transfer them to the master system (which I need to do to work with the images when I'm at home**), I load them folder by folder onto the desktop external drive, and log them into Organiser on my desktop.  That's wjhen PE23 (and the previous versions) seems to decide to change the timestamp on every image to GMT, hence the 11 hour change to the timestamp on my Australian images. (The local time of day is what I need organiser to show, because that is relevant to travel photography - not least to get sensible times for sunrise and sunset photos!).

Your second paragraph does partially explain why I end up with different timestamps on two photos in edited 'version sets' (except that I keep the edited photos as 'top of set' and they seem to have their times unchanged, while the original images have the timestamps changed). Of course I lose the 'version sets' when I move the images to my desktpp, folder by folder, because the original and edited image are viewed just as two separate files, so I have to recreate these using 'image stacks.  That's a relatively quick task when they have the same timestamp - but it gets really confusing when PE changes the timestamp on the originals but not the edited files)!

I understand what you are suggesting about moving the photo files and catalogue together onto the desktop, using 'backup and restore'.  But surely that would override and wipe my master catalogue on the desktop, which would be a total disaster?

I just don't understand why Organiser messes with the timestamps in the first place. I simply want Organiser to show the time of day when I took the photos in Australia or wherever - I am not in the least interested in what the UK time was when I took the photos!

(**For background, I'm lucky enough to work as a guest speaker on cruise ships, so spend a lot of time travelling and taking photos, which I then use in my presentations when i return to that area on a subsequent cruise. I do most of the work preparing presentations when I'm at home, which is why I need access to my vast inventory of photos.  They need heavy culling, for sure, but I rarely have the time to do that!).

So I go back to my original question: is there any way to stop Organiser messing with the timestamps on my photos.  I basically want to retain the timestamp my camera puts on the photos, because I am usually pretty meticulous in having my camera set to the right time zone.  On the odd occasion when I forget to change timezones, I'm happy to adjust that manually when I download the images to my desktop - and that adjusted timestamp is the one I want retained in my system. I really don't understand why Big Brother Adobe think I would want the timestamps automatically changed in the way that they seem to think is best for me!!!

Sorry for the long post - but maybe it helps you understand my problem.  Any more help you can offer would be hiugely appreciated!