Essential Tools Module User's Guide : Chapter 3 Date and Time Classes : The Date and Time Collectable Class
The Date and Time Collectable Class
RWDateTime is represented as a collectable by a corresponding collectable class inheriting from RWCollectable.
This class is RWCollectableDateTime.
This class is 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.