dates

[[ 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: