I have the latest version of PSE and I have just noticed that when I edit a photo which was taken at 11:05am and save a psd or jpg file the time stamp changes to 12:05pm. This only seems to affect photos taken after 31st October when we changed from BST to GMT. It did not happen in previous years.
It would appear that PSE thinks we are still on British Summer Time.
I am running Windows 10 Home and the time zone is set to '(UTC+0.00), Dublin, Edinburgh, Lisbon, London'. Set the time automatically is On, but set the time zone automatically is Off. Adjust for daylight saving time automatically is also On.
I have tried changing Set the time zone automatically to On and Set the time automatically to Off but this does not solve the problem.
Even when I changed the computer clock to BST this did not solve the problem so PSE is picking up the time from somewhere else.
My camera is set to record the time a photo was taken to GMT, and my computer clock also uses GMT.
My Sony Alpha 1 has a menu option to switch Daylight Savings from On to Off. When I took yesterday's photos it was set to On and changing it to Off means that edited files keep the same time stamp as the original.