Do Bottles Still Have Dates on the Bottom?

I have a few new bottles that have what look like dates on the bottom. They aren't dusties, but I'm curious if they still do it on some bottles. For example: Elmer T Lee with 10 and Buffalo Trace with 09 and both are underscored. My Rittenhouse rye has an 11 off to the bottom right.

Depends on the glass manufacturer. Some do, some don't. I don't have either of those bottles on hand but I can tell you that both BT and HH do use dated bottles for some, but not all, of their labels.