→Date Type: emphasize the Preferences modifier for date quality
*Regular: A "regular" date is one which includes an interval spanning a specific day, month, or year. It can be complete (or 'fully qualified' for a 24 hour interval like June 6, 1990) or partial (like omitting the day for a 1 month interval like July 1977 or omitting the day and month for a 1 year interval).
*Before: A "before" date is one that can only be identified as occurring (in a preferences-defined long interval) prior to a certain day, month, or year.
*After: An "after" date is one that occurs (in a 2nd preferences-defined long interval) following a certain day, month, or year.
*About: An "about" (circa) date is one that occurs (in yet another preferences-defined
smaller interval) before '''or''' after a certain day, month, or year.
*Range: A "range" describes a time period during in which the event occurred. It could be recurrent event during the interval or a single instance believed to have occurred between known boundary dates.