Configure Memory (Photos) titles to have a specific date format (M-D-Y or Y-M-D)
if you open the folder in Finder it can be made to list the date created. Open a finder window and click on the button that looks like a gear with the word action under it. The last entry is 'Show View Options'. You can click on this and you'll get a new pane where you can select what columns to display in a finder window. Be sure to select Date Created. You can then sort the files by date created and separate them however you see fit.