PhutilCalendarRelativeDateTime.php
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	<?php

	final class PhutilCalendarRelativeDateTime
	extends PhutilCalendarProxyDateTime {

	private $duration;

	public function setOrigin(PhutilCalendarDateTime $origin) {
	return $this->setProxy($origin);
	}

	public function getOrigin() {
	return $this->getProxy();
	}

	public function setDuration(PhutilCalendarDuration $duration) {
	$this->duration = $duration;
	return $this;
	}

	public function getDuration() {
	return $this->duration;
	}

	public function newPHPDateTime() {
	$datetime = parent::newPHPDateTime();
	$duration = $this->getDuration();

	if ($duration->getIsNegative()) {
	$sign = '-';
	} else {
	$sign = '+';
	}

	$map = array(
	'weeks' => $duration->getWeeks(),
	'days' => $duration->getDays(),
	'hours' => $duration->getHours(),
	'minutes' => $duration->getMinutes(),
	'seconds' => $duration->getSeconds(),
	);

	foreach ($map as $unit => $value) {
	if (!$value) {
	continue;
	}
	$datetime->modify("{$sign}{$value} {$unit}");
	}

	return $datetime;
	}

	}