I'm trying to create a real-time process that triggers when a date field is changed on a record. However, when I create the process, and select it to run when "record fields change," I only see a subset of my columns available to be selected.

I thought it was maybe because the field was set as "Date Only," but I created four tests that are all varying settings of Date & Time and none of them appear to be available when clicking "Select." What am I missing? Any help would be appreciated.