/**
* Orders days from earlier to later
* @param Day $firstDay
* @param Day $secondDay
* @return array of Day objects sorted by date (ascending)
*/
protected static function order(Day $firstDay, Day $secondDay)
{
if ($secondDay->isEarlierThan($firstDay)) {
$earlierDay = $secondDay;
$laterDay = $firstDay;
} else {
$earlierDay = $firstDay;
$laterDay = $secondDay;
}
return array($earlierDay, $laterDay);
}
