"Date Last Opened" field not updating in WebLocs?

I've got a folder of URL files on the desktop. I'm coding a Hazel script to keep an eye on these things, eventually tossing them out after a a year if they're not being used. Problems:
1. Opening one of these things doesn't update the "Date Last Opened" field on the OS's Get Info screen (probably an OS thing beyond Hazel's ken), and....
2. Probably more important: Hazel itself is not recognizing ANY date in this field...it shows as blank in the Get Info screen in the "Show Rule Status" screen.
Hmmmmmm.......
1. Opening one of these things doesn't update the "Date Last Opened" field on the OS's Get Info screen (probably an OS thing beyond Hazel's ken), and....
2. Probably more important: Hazel itself is not recognizing ANY date in this field...it shows as blank in the Get Info screen in the "Show Rule Status" screen.
Hmmmmmm.......