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<?php
/**
* Date period object - rather than a point in time, this object represents a PERIOD of time. So,
* it consists of a start and end point in time
*
* @package qCal
* @subpackage qCal_Date
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
*/
class qCal_DateTime_Period {
/**
* Start and end date/times
*/
protected $start, $end;
/**
* Constructor
*/
public function __construct($start, $end) {
if (!($start instanceof qCal_DateTime)) {
$start = qCal_DateTime::factory($start);
}
if (!($end instanceof qCal_DateTime)) {
$end = qCal_DateTime::factory($end);
}
$this->start = $start;
$this->end = $end;
if ($this->getSeconds() < 0) {
throw new qCal_DateTime_Exception_InvalidPeriod("The start date must come before the end date.");
}
}
/**
* Converts to how many seconds between the two. because this is the smallest increment
* used in this class, seconds are used to determine other increments
*/
public function getSeconds() {
return $this->end->getUnixTimestamp() - $this->start->getUnixTimestamp();
}
/**
* Returns start date
*/
public function getStart() {
return $this->start;
}
/**
* Returns end date
*/
public function getEnd() {
return $this->end;
}
}