returns true if an event has already occurred before a date
if is includeRefDate true, then an event has not occurred if its
date is the same as the refDate, i.e. this method returns false if
the event date is the same as the refDate.
Parameters
Default value d: Date = null
Default value includeRefDate: boolean = null
Returns boolean
notifyObservers
notifyObservers(): void
This method should be called at the end of non-const methods
or when the programmer desires to notify any changes.
returns true if an event has already occurred before a date if is includeRefDate true, then an event has not occurred if its date is the same as the refDate, i.e. this method returns false if the event date is the same as the refDate.