PhabricatorCalendarEventStartDateTransaction.php
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	<?php

	final class PhabricatorCalendarEventStartDateTransaction
	extends PhabricatorCalendarEventDateTransaction {

	const TRANSACTIONTYPE = 'calendar.startdate';

	public function generateOldValue($object) {
	// TODO: Upgrade this.
	return $object->getStartDateTimeEpoch();
	}

	public function applyInternalEffects($object, $value) {
	$actor = $this->getActor();

	$datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	$value,
	$actor->getTimezoneIdentifier());
	$datetime->setIsAllDay($object->getIsAllDay());
	$object->setStartDateTime($datetime);
	}

	public function getTitle() {
	return pht(
	'%s changed the start date for this event from %s to %s.',
	$this->renderAuthor(),
	$this->renderOldDate(),
	$this->renderNewDate());
	}

	public function getTitleForFeed() {
	return pht(
	'%s changed the start date for %s from %s to %s.',
	$this->renderAuthor(),
	$this->renderObject(),
	$this->renderOldDate(),
	$this->renderNewDate());
	}

	protected function getInvalidDateMessage() {
	return pht('Start date is invalid.');
	}

	}