var fieldtype = sublist.addField({
	id : ‘custpage_date_created’,
	type : serverWidget.FieldType.DATE,
	label : ‘Created’
})
...
var created = searchResults[i].getValue({
	name : ‘dateCreated’
});
...
created = new Date(created);
sublist.setSublistValue({
	id : ‘someid’,
	line : i,
	value : created
});