There are 3 main classes declared in {\tt <wx/datetime.h>}: except
\helpref{wxDateTime}{wxdatetime} itself which represents an absolute
moment in time, there are also two classes -
-\helpref{wxTimeSpan}{wxtimespan} and \helpref{wxDateSpan}{wxdatespan} which
+\helpref{wxTimeSpan}{wxtimespan} and \helpref{wxDateSpan}{wxdatespan} - which
represent the intervals of time.
There are also helper classes which are used together with wxDateTime: