Calculating the current date requires help from the local Scheme interpreter, since Scheme defines no standard functions on dates. Shown below are versions for two popular Scheme interpreters:(define (today) ; Chez Scheme (julian (date-year (current-date)) (+ (date-month (current-date)) 1) ...
For example, 17th-century Eurocentric names for the areas that would ultimately comprise Pennsylvania were connected to land claims and treaties among Dutch and English powers, all of which had beginning and end dates, and were defined by particular geometries. The “Setting” model as set forward...