Essential Tools Module User's Guide : Chapter 3 Date and Time Classes : The Date and Time Collectable Class
The Date and Time Collectable Class
RWDate and RWDateTime are represented as collectables by corresponding collectable classes inheriting from RWCollectable.
These classes are RWCollectableDate and RWCollectableDateTime.
These classes are useful when date/time objects are used as keys in the “dictionary” collection classes, or if date/time objects are stored and retrieved as RWCollectables.