private static boolean isValidDate(LocalDate date) {
		if (date == null) {
			return false;
		}

		if (date == DateColumnConstraintProvider.DEFAULT_DATE) {
			return false;
		}
		// the DateColumnConstraintProvider.DEFAULT_DATE is a made-up illegal Date so that
		// if it is encountered by the editor, it knows to sub in a date relative to the current
		// date
		return date.toEpochDay() != DateColumnConstraintProvider.DEFAULT_DATE.toEpochDay();
	}
Constructor.

@param constraint Date constraint for which this component is an editor.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/constrainteditor/DateValueConstraintEditor.java