Moved files from old to new computer. Restored backup and for the most part successful. I have a lot of photos (scaned in from pre-ditigal days), and I changed the metadata to a particular date, but with no time stamp. The date was retained, but the time stamp was changed on hundred of photos from no time at all to 12:00 am. I will have to go back and change each one manually unless so one has a solution to change times in mass.
Would a newer version of Elements has avoided this issue? A bit late, but now thinking of updated to 2021 version.
If you are trying to delete the time stamp (but keep the date):
Multi-select all of the images that you want to change
Right-click on one and select Adjust Date and Time of selected items
Select Change to a specified date and time and click OK
Select Time - Unknown and click OK
The time will be removed from all of the selected files. If you want to place a specific time on multiple files, choose the Time - Known option and you can then enter the desired time.
I believe this option has not changed since version 14. And whatever it is you did to cause the issue is probably no different in the current version. Did you create a new catalog and import the files or did you Restore from a catalog backup? I assume you did the former. I believe the latter would not have created the problem.