[[ NB: if you're looking for systems to use in marking up dates in judicial opinions, you might take a look at
Dates are a surprisingly complicated topic, with many subtleties and variations. That is because almost any milestone in the process of hearing the case and carrying out its resolution can have a date associated with it, as can any of the documents generated along the way. Every case will have a date of decision. Most appellate cases will have an argument or hearing date. Beyond that the varieties are practically infinite:
This page is an index of overview documents that describe, non-technically, different classes of element found in Layer 2 of the oai4courts caselaw metadata standard. They provide descriptions of the different logical entities described by the oai4courts Layer 2 elements, as well as pointers to each.
Note that these are intended for use in caselaw metadata (as opposed to caselaw markup), but some of the thinking involved applies to both.
Overview descriptions exist for: