Hi Manuel Gozalbes
I think that implement a flexible portal for dates could be a good idea, as the measure portal, a neutral portal to add any kind of date, with date and remark as you say, but I think will need to expand it with the typology
of the date to ensure that this date is calibrate date, or other posibilites.
Another thing to think about is that this portal will overlap with the chronological thesaurus, because if you want to define some dates as periods the right way is to use the chronological thesaurus. So a portal for different dates could be fine, but I think you need a "context of use" for the users. And current date fields will still be needed as well.
Best