PhutilCalendarDateTime.php
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	<?php

	abstract class PhutilCalendarDateTime
	extends Phobject {

	private $viewerTimezone;
	private $isAllDay = false;

	public function setViewerTimezone($viewer_timezone) {
	$this->viewerTimezone = $viewer_timezone;
	return $this;
	}

	public function getViewerTimezone() {
	return $this->viewerTimezone;
	}

	public function setIsAllDay($is_all_day) {
	$this->isAllDay = $is_all_day;
	return $this;
	}

	public function getIsAllDay() {
	return $this->isAllDay;
	}

	public function getEpoch() {
	$datetime = $this->newPHPDateTime();
	return (int)$datetime->format('U');
	}

	public function getISO8601() {
	$datetime = $this->newPHPDateTime();

	if ($this->getIsAllDay()) {
	return $datetime->format('Ymd');
	} else if ($this->getTimezone()) {
	// With a timezone, the event occurs at a specific second universally.
	// We return the UTC representation of that point in time.
	$datetime->setTimezone(new DateTimeZone('UTC'));
	return $datetime->format('Ymd\\THis\\Z');
	} else {
	// With no timezone, events are "floating" and occur at local time.
	// We return a representation without the "Z".
	return $datetime->format('Ymd\\THis');
	}
	}

	public function newAbsoluteDateTime() {
	$epoch = $this->getEpoch();
	$timezone = $this->getTimezone();
	return PhutilCalendarAbsoluteDateTime::newFromEpoch($epoch, $timezone)
	->setIsAllDay($this->getIsAllDay())
	->setViewerTimezone($this->getViewerTimezone());
	}

	abstract public function newPHPDateTimeZone();
	abstract public function newPHPDateTime();

	abstract public function getTimezone();
	}