query('startDate').optional().custom(isDateValid).withMessage('Should have a valid start date'),
query('endDate').optional().custom(isDateValid).withMessage('Should have a valid end date'),
+ query('originallyPublishedStartDate').optional().custom(isDateValid).withMessage('Should have a valid published start date'),
+ query('originallyPublishedEndDate').optional().custom(isDateValid).withMessage('Should have a valid published end date'),
+
query('durationMin').optional().isInt().withMessage('Should have a valid min duration'),
query('durationMax').optional().isInt().withMessage('Should have a valid max duration'),