class-fred.php

$data = array(
	'interval'          => strtotime( $data[1]->date ) - strtotime( $data[0]->date ),
	'data'              => $values,
	'units'             => $unit['unit'],
	'start'             => strtotime( $data[0]->date ),
	'end'               => strtotime( $to ),
	'name'              => $entity['name'],
	'metric'            => $metric['name'],
	'source'            => $entity['data']['source']['name'],
	'observation_start' => $entity['data']['observation_start']
);