You can have several Aperture libraries.
Create a smart album in Aperture
New > Smart Album from the main menu bar
then click "Add Rule" and pick "date".
In the "Smart Settings " HUD set the Date to after 01.01.2012.
This will give you a smart album with all images taken after 1.1.2012.
Then export this album as a new Aperture library.
File > Export > Smart Album as New Library.
Select the new library in the Finder and double click it. If you are satisfied, all images have been imported o.k., select all images and use
File > Consolidate Originals.
This will move all referenced original files into your new library. Work with it and explore the new library.
If you are satisfied, back up the old library and delete it from your system drive, if you want.
Many thanks, I'm a bit green with this. That would have helped but now I have a bigger issue.
All the Projects and images seem to be in the trash, don't know how that happened 'user error' I guess.
There was an upgrade when I switched Aperture in each library and that may have contributed. The issue now is that all the Projects/files/images are in the Aperture trash, how do I get them back. I've tried dragging them and that doesn't seem to work.