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	diff --git a/resources/sql/autopatches/20160715.event.03.allday.php b/resources/sql/autopatches/20160715.event.03.allday.php
	index 8bc3ffe568..4c2d73a368 100644
	--- a/resources/sql/autopatches/20160715.event.03.allday.php
	+++ b/resources/sql/autopatches/20160715.event.03.allday.php
	@@ -1,52 +1,3 @@
	<?php

	-$table = new PhabricatorCalendarEvent();
	-$conn = $table->establishConnection('w');
	-
	-// Previously, "All Day" events were stored with a start and end date set to
	-// the earliest possible start and end seconds for the corresponding days. We
	-// now store all day events with their "date" epochs as UTC, separate from
	-// individual event times.
	-$zone_min = new DateTimeZone('Pacific/Midway');
	-$zone_max = new DateTimeZone('Pacific/Kiritimati');
	-$zone_utc = new DateTimeZone('UTC');
	-
	-foreach (new LiskMigrationIterator($table) as $event) {
	- // If this event has already migrated, skip it.
	- if ($event->getAllDayDateFrom()) {
	- continue;
	- }
	-
	- $is_all_day = $event->getIsAllDay();
	-
	- $epoch_min = $event->getDateFrom();
	- $epoch_max = $event->getDateTo();
	-
	- $date_min = new DateTime('@'.$epoch_min);
	- $date_max = new DateTime('@'.$epoch_max);
	-
	- if ($is_all_day) {
	- $date_min->setTimeZone($zone_min);
	- $date_min->modify('+2 days');
	- $date_max->setTimeZone($zone_max);
	- $date_max->modify('-2 days');
	- } else {
	- $date_min->setTimeZone($zone_utc);
	- $date_max->setTimeZone($zone_utc);
	- }
	-
	- $string_min = $date_min->format('Y-m-d');
	- $string_max = $date_max->format('Y-m-d 23:59:00');
	-
	- $allday_min = id(new DateTime($string_min, $zone_utc))->format('U');
	- $allday_max = id(new DateTime($string_max, $zone_utc))->format('U');
	-
	- queryfx(
	- $conn,
	- 'UPDATE %T SET allDayDateFrom = %d, allDayDateTo = %d
	- WHERE id = %d',
	- $table->getTableName(),
	- $allday_min,
	- $allday_max,
	- $event->getID());
	-}
	+// This migration was replaced by "20161004.cal.01.noepoch.php".
	diff --git a/resources/sql/autopatches/20161004.cal.01.noepoch.php b/resources/sql/autopatches/20161004.cal.01.noepoch.php
	new file mode 100644
	index 0000000000..6013376062
	--- /dev/null
	+++ b/resources/sql/autopatches/20161004.cal.01.noepoch.php
	@@ -0,0 +1,125 @@
	+<?php
	+
	+$table = new PhabricatorCalendarEvent();
	+$conn = $table->establishConnection('w');
	+$table_name = 'calendar_event';
	+
	+// Long ago, "All Day" events were stored with a start and end date set to
	+// the earliest possible start and end seconds for the corresponding days. We
	+// then moved to store all day events with their "date" epochs as UTC, separate
	+// from individual event times. Both systems were later replaced with use of
	+// CalendarDateTime.
	+$zone_min = new DateTimeZone('Pacific/Midway');
	+$zone_max = new DateTimeZone('Pacific/Kiritimati');
	+$zone_utc = new DateTimeZone('UTC');
	+
	+foreach (new LiskRawMigrationIterator($conn, $table_name) as $row) {
	+ $parameters = phutil_json_decode($row['parameters']);
	+ if (isset($parameters['startDateTime'])) {
	+ // This event has already been migrated.
	+ continue;
	+ }
	+
	+ $is_all_day = $row['isAllDay'];
	+
	+ if (empty($row['allDayDateFrom'])) {
	+ // No "allDayDateFrom" means this is an old event which was never migrated
	+ // by the earlier "20160715.event.03.allday.php" migration. The dateFrom
	+ // and dateTo will be minimum and maximum earthly seconds for the event. We
	+ // convert them to UTC if they were in extreme timezones.
	+ $epoch_min = $row['dateFrom'];
	+ $epoch_max = $row['dateTo'];
	+
	+ if ($is_all_day) {
	+ $date_min = new DateTime('@'.$epoch_min);
	+ $date_max = new DateTime('@'.$epoch_max);
	+
	+ $date_min->setTimeZone($zone_min);
	+ $date_min->modify('+2 days');
	+ $date_max->setTimeZone($zone_max);
	+ $date_max->modify('-2 days');
	+
	+ $string_min = $date_min->format('Y-m-d');
	+ $string_max = $date_max->format('Y-m-d 23:59:00');
	+
	+ $utc_min = id(new DateTime($string_min, $zone_utc))->format('U');
	+ $utc_max = id(new DateTime($string_max, $zone_utc))->format('U');
	+ } else {
	+ $utc_min = $epoch_min;
	+ $utc_max = $epoch_max;
	+ }
	+ } else {
	+ // This is an event which was migrated already. We can pick the correct
	+ // epoch timestamps based on the "isAllDay" flag.
	+ if ($is_all_day) {
	+ $utc_min = $row['allDayDateFrom'];
	+ $utc_max = $row['allDayDateTo'];
	+ } else {
	+ $utc_min = $row['dateFrom'];
	+ $utc_max = $row['dateTo'];
	+ }
	+ }
	+
	+ $utc_until = $row['recurrenceEndDate'];
	+
	+ $start_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch($utc_min);
	+ if ($is_all_day) {
	+ $start_datetime->setIsAllDay(true);
	+ }
	+
	+ $end_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch($utc_max);
	+ if ($is_all_day) {
	+ $end_datetime->setIsAllDay(true);
	+ }
	+
	+ if ($utc_until) {
	+ $until_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch($utc_until);
	+ } else {
	+ $until_datetime = null;
	+ }
	+
	+ $parameters['startDateTime'] = $start_datetime->toDictionary();
	+ $parameters['endDateTime'] = $end_datetime->toDictionary();
	+ if ($until_datetime) {
	+ $parameters['untilDateTime'] = $until_datetime->toDictionary();
	+ }
	+
	+ queryfx(
	+ $conn,
	+ 'UPDATE %T SET parameters = %s WHERE id = %d',
	+ $table_name,
	+ phutil_json_encode($parameters),
	+ $row['id']);
	+}
	+
	+// Generate UTC epochs for all events. We can't readily do this one at a
	+// time because instance UTC epochs rely on having the parent event.
	+$viewer = PhabricatorUser::getOmnipotentUser();
	+
	+$all_events = id(new PhabricatorCalendarEventQuery())
	+ ->setViewer($viewer)
	+ ->execute();
	+foreach ($all_events as $event) {
	+ if ($event->getUTCInitialEpoch()) {
	+ // Already migrated.
	+ continue;
	+ }
	+
	+ try {
	+ $event->updateUTCEpochs();
	+ } catch (Exception $ex) {
	+ continue;
	+ }
	+
	+ queryfx(
	+ $conn,
	+ 'UPDATE %T SET
	+ utcInitialEpoch = %d,
	+ utcUntilEpoch = %nd,
	+ utcInstanceEpoch = %nd WHERE id = %d',
	+ $table_name,
	+ $event->getUTCInitialEpoch(),
	+ $event->getUTCUntilEpoch(),
	+ $event->getUTCInstanceEpoch(),
	+ $event->getID());
	+}
	diff --git a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
	index 6c10964b02..1ba40d51a6 100644
	--- a/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
	+++ b/src/applications/calendar/query/PhabricatorCalendarEventQuery.php
	@@ -1,528 +1,528 @@
	<?php

	final class PhabricatorCalendarEventQuery
	extends PhabricatorCursorPagedPolicyAwareQuery {

	private $ids;
	private $phids;
	private $rangeBegin;
	private $rangeEnd;
	private $inviteePHIDs;
	private $hostPHIDs;
	private $isCancelled;
	private $eventsWithNoParent;
	private $instanceSequencePairs;
	private $isStub;

	private $generateGhosts = false;

	public function newResultObject() {
	return new PhabricatorCalendarEvent();
	}

	public function setGenerateGhosts($generate_ghosts) {
	$this->generateGhosts = $generate_ghosts;
	return $this;
	}

	public function withIDs(array $ids) {
	$this->ids = $ids;
	return $this;
	}

	public function withPHIDs(array $phids) {
	$this->phids = $phids;
	return $this;
	}

	public function withDateRange($begin, $end) {
	$this->rangeBegin = $begin;
	$this->rangeEnd = $end;
	return $this;
	}

	public function withInvitedPHIDs(array $phids) {
	$this->inviteePHIDs = $phids;
	return $this;
	}

	public function withHostPHIDs(array $phids) {
	$this->hostPHIDs = $phids;
	return $this;
	}

	public function withIsCancelled($is_cancelled) {
	$this->isCancelled = $is_cancelled;
	return $this;
	}

	public function withIsStub($is_stub) {
	$this->isStub = $is_stub;
	return $this;
	}

	public function withEventsWithNoParent($events_with_no_parent) {
	$this->eventsWithNoParent = $events_with_no_parent;
	return $this;
	}

	public function withInstanceSequencePairs(array $pairs) {
	$this->instanceSequencePairs = $pairs;
	return $this;
	}

	protected function getDefaultOrderVector() {
	return array('start', 'id');
	}

	public function getBuiltinOrders() {
	return array(
	'start' => array(
	'vector' => array('start', 'id'),
	'name' => pht('Event Start'),
	),
	) + parent::getBuiltinOrders();
	}

	public function getOrderableColumns() {
	return array(
	'start' => array(
	'table' => $this->getPrimaryTableAlias(),
	'column' => 'dateFrom',
	'reverse' => true,
	'type' => 'int',
	'unique' => false,
	),
	) + parent::getOrderableColumns();
	}

	protected function getPagingValueMap($cursor, array $keys) {
	$event = $this->loadCursorObject($cursor);
	return array(
	'start' => $event->getStartDateTimeEpoch(),
	'id' => $event->getID(),
	);
	}

	protected function shouldLimitResults() {
	// When generating ghosts, we can't rely on database ordering because
	// MySQL can't predict the ghost start times. We'll just load all matching
	// events, then generate results from there.
	if ($this->generateGhosts) {
	return false;
	}

	return true;
	}

	protected function loadPage() {
	$events = $this->loadStandardPage($this->newResultObject());

	$viewer = $this->getViewer();
	foreach ($events as $event) {
	$event->applyViewerTimezone($viewer);
	}

	if (!$this->generateGhosts) {
	return $events;
	}

	$raw_limit = $this->getRawResultLimit();

	if (!$raw_limit && !$this->rangeEnd) {
	throw new Exception(
	pht(
	'Event queries which generate ghost events must include either a '.
	'result limit or an end date, because they may otherwise generate '.
	'an infinite number of results. This query has neither.'));
	}

	foreach ($events as $key => $event) {
	$sequence_start = 0;
	$sequence_end = null;
	$end = null;

	$instance_of = $event->getInstanceOfEventPHID();

	if ($instance_of == null && $this->isCancelled !== null) {
	if ($event->getIsCancelled() != $this->isCancelled) {
	unset($events[$key]);
	continue;
	}
	}
	}

	// Pull out all of the parents first. We may discard them as we begin
	// generating ghost events, but we still want to process all of them.
	$parents = array();
	foreach ($events as $key => $event) {
	if ($event->isParentEvent()) {
	$parents[$key] = $event;
	}
	}

	// Now that we've picked out all the parent events, we can immediately
	// discard anything outside of the time window.
	$events = $this->getEventsInRange($events);

	$enforced_end = null;
	foreach ($parents as $key => $event) {
	$sequence_start = 0;
	$sequence_end = null;
	$start = null;

	$duration = $event->getDuration();

	$frequency = $event->getFrequencyUnit();
	$modify_key = '+1 '.$frequency;

	if (($this->rangeBegin !== null) &&
	($this->rangeBegin > $event->getStartDateTimeEpoch())) {
	$max_date = $this->rangeBegin - $duration;
	$date = $event->getStartDateTimeEpoch();
	$datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);

	while ($date < $max_date) {
	// TODO: optimize this to not loop through all off-screen events
	$sequence_start++;
	$datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
	$date = $datetime->modify($modify_key)->format('U');
	}

	$start = $this->rangeBegin;
	} else {
	$start = $event->getStartDateTimeEpoch() - $duration;
	}

	$date = $start;
	$datetime = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);

	// Select the minimum end time we need to generate events until.
	$end_times = array();
	if ($this->rangeEnd) {
	$end_times[] = $this->rangeEnd;
	}

	if ($event->getRecurrenceEndDate()) {
	$end_times[] = $event->getRecurrenceEndDate();
	}

	if ($enforced_end) {
	$end_times[] = $enforced_end;
	}

	if ($end_times) {
	$end = min($end_times);
	$sequence_end = $sequence_start;
	while ($date < $end) {
	$sequence_end++;
	$datetime->modify($modify_key);
	$date = $datetime->format('U');
	if ($sequence_end > $raw_limit + $sequence_start) {
	break;
	}
	}
	} else {
	$sequence_end = $raw_limit + $sequence_start;
	}

	$sequence_start = max(1, $sequence_start);
	for ($index = $sequence_start; $index < $sequence_end; $index++) {
	$events[] = $event->newGhost($viewer, $index);
	}

	// NOTE: We're slicing results every time because this makes it cheaper
	// to generate future ghosts. If we already have 100 events that occur
	// before July 1, we know we never need to generate ghosts after that
	// because they couldn't possibly ever appear in the result set.

	if ($raw_limit) {
	if (count($events) > $raw_limit) {
	$events = msort($events, 'getStartDateTimeEpoch');
	$events = array_slice($events, 0, $raw_limit, true);
	$enforced_end = last($events)->getStartDateTimeEpoch();
	}
	}
	}

	// Now that we're done generating ghost events, we're going to remove any
	// ghosts that we have concrete events for (or which we can load the
	// concrete events for). These concrete events are generated when users
	// edit a ghost, and replace the ghost events.

	// First, generate a map of all concrete <parentPHID, sequence> events we
	// already loaded. We don't need to load these again.
	$have_pairs = array();
	foreach ($events as $event) {
	if ($event->getIsGhostEvent()) {
	continue;
	}

	$parent_phid = $event->getInstanceOfEventPHID();
	$sequence = $event->getSequenceIndex();

	$have_pairs[$parent_phid][$sequence] = true;
	}

	// Now, generate a map of all <parentPHID, sequence> events we generated
	// ghosts for. We need to try to load these if we don't already have them.
	$map = array();
	$parent_pairs = array();
	foreach ($events as $key => $event) {
	if (!$event->getIsGhostEvent()) {
	continue;
	}

	$parent_phid = $event->getInstanceOfEventPHID();
	$sequence = $event->getSequenceIndex();

	// We already loaded the concrete version of this event, so we can just
	// throw out the ghost and move on.
	if (isset($have_pairs[$parent_phid][$sequence])) {
	unset($events[$key]);
	continue;
	}

	// We didn't load the concrete version of this event, so we need to
	// try to load it if it exists.
	$parent_pairs[] = array($parent_phid, $sequence);
	$map[$parent_phid][$sequence] = $key;
	}

	if ($parent_pairs) {
	$instances = id(new self())
	->setViewer($viewer)
	->setParentQuery($this)
	->withInstanceSequencePairs($parent_pairs)
	->execute();

	foreach ($instances as $instance) {
	$parent_phid = $instance->getInstanceOfEventPHID();
	$sequence = $instance->getSequenceIndex();

	$indexes = idx($map, $parent_phid);
	$key = idx($indexes, $sequence);

	// Replace the ghost with the corresponding concrete event.
	$events[$key] = $instance;
	}
	}

	$events = msort($events, 'getStartDateTimeEpoch');

	return $events;
	}

	protected function buildJoinClauseParts(AphrontDatabaseConnection $conn_r) {
	$parts = parent::buildJoinClauseParts($conn_r);

	if ($this->inviteePHIDs !== null) {
	$parts[] = qsprintf(
	$conn_r,
	'JOIN %T invitee ON invitee.eventPHID = event.phid
	AND invitee.status != %s',
	id(new PhabricatorCalendarEventInvitee())->getTableName(),
	PhabricatorCalendarEventInvitee::STATUS_UNINVITED);
	}

	return $parts;
	}

	protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
	$where = parent::buildWhereClauseParts($conn);

	if ($this->ids) {
	$where[] = qsprintf(
	$conn,
	'event.id IN (%Ld)',
	$this->ids);
	}

	if ($this->phids) {
	$where[] = qsprintf(
	$conn,
	'event.phid IN (%Ls)',
	$this->phids);
	}

	// NOTE: The date ranges we query for are larger than the requested ranges
	// because we need to catch all-day events. We'll refine this range later
	// after adjusting the visible range of events we load.

	if ($this->rangeBegin) {
	$where[] = qsprintf(
	$conn,
	- 'event.dateTo >= %d OR event.isRecurring = 1',
	+ '(event.utcUntilEpoch >= %d) OR (event.utcUntilEpoch IS NULL)',
	$this->rangeBegin - phutil_units('16 hours in seconds'));
	}

	if ($this->rangeEnd) {
	$where[] = qsprintf(
	$conn,
	- 'event.dateFrom <= %d',
	+ 'event.utcInitialEpoch <= %d',
	$this->rangeEnd + phutil_units('16 hours in seconds'));
	}

	if ($this->inviteePHIDs !== null) {
	$where[] = qsprintf(
	$conn,
	'invitee.inviteePHID IN (%Ls)',
	$this->inviteePHIDs);
	}

	if ($this->hostPHIDs) {
	$where[] = qsprintf(
	$conn,
	'event.hostPHID IN (%Ls)',
	$this->hostPHIDs);
	}

	if ($this->isCancelled !== null) {
	$where[] = qsprintf(
	$conn,
	'event.isCancelled = %d',
	(int)$this->isCancelled);
	}

	if ($this->eventsWithNoParent == true) {
	$where[] = qsprintf(
	$conn,
	'event.instanceOfEventPHID IS NULL');
	}

	if ($this->instanceSequencePairs !== null) {
	$sql = array();

	foreach ($this->instanceSequencePairs as $pair) {
	$sql[] = qsprintf(
	$conn,
	'(event.instanceOfEventPHID = %s AND event.sequenceIndex = %d)',
	$pair[0],
	$pair[1]);
	}

	$where[] = qsprintf(
	$conn,
	'%Q',
	implode(' OR ', $sql));
	}

	if ($this->isStub !== null) {
	$where[] = qsprintf(
	$conn,
	'event.isStub = %d',
	(int)$this->isStub);
	}

	return $where;
	}

	protected function getPrimaryTableAlias() {
	return 'event';
	}

	protected function shouldGroupQueryResultRows() {
	if ($this->inviteePHIDs !== null) {
	return true;
	}
	return parent::shouldGroupQueryResultRows();
	}

	protected function getApplicationSearchObjectPHIDColumn() {
	return 'event.phid';
	}

	public function getQueryApplicationClass() {
	return 'PhabricatorCalendarApplication';
	}


	protected function willFilterPage(array $events) {
	$instance_of_event_phids = array();
	$recurring_events = array();
	$viewer = $this->getViewer();

	$events = $this->getEventsInRange($events);

	$phids = array();

	foreach ($events as $event) {
	$phids[] = $event->getPHID();
	$instance_of = $event->getInstanceOfEventPHID();

	if ($instance_of) {
	$instance_of_event_phids[] = $instance_of;
	}
	}

	if (count($instance_of_event_phids) > 0) {
	$recurring_events = id(new PhabricatorCalendarEventQuery())
	->setViewer($viewer)
	->withPHIDs($instance_of_event_phids)
	->withEventsWithNoParent(true)
	->execute();

	$recurring_events = mpull($recurring_events, null, 'getPHID');
	}

	if ($events) {
	$invitees = id(new PhabricatorCalendarEventInviteeQuery())
	->setViewer($viewer)
	->withEventPHIDs($phids)
	->execute();
	$invitees = mgroup($invitees, 'getEventPHID');
	} else {
	$invitees = array();
	}

	foreach ($events as $key => $event) {
	$event_invitees = idx($invitees, $event->getPHID(), array());
	$event->attachInvitees($event_invitees);

	$instance_of = $event->getInstanceOfEventPHID();
	if (!$instance_of) {
	continue;
	}
	$parent = idx($recurring_events, $instance_of);

	// should never get here
	if (!$parent) {
	unset($events[$key]);
	continue;
	}
	$event->attachParentEvent($parent);

	if ($this->isCancelled !== null) {
	if ($event->getIsCancelled() != $this->isCancelled) {
	unset($events[$key]);
	continue;
	}
	}
	}

	$events = msort($events, 'getStartDateTimeEpoch');

	return $events;
	}

	private function getEventsInRange(array $events) {
	$range_start = $this->rangeBegin;
	$range_end = $this->rangeEnd;

	foreach ($events as $key => $event) {
	$event_start = $event->getStartDateTimeEpoch();
	$event_end = $event->getEndDateTimeEpoch();

	if ($range_start && $event_end < $range_start) {
	unset($events[$key]);
	}

	if ($range_end && $event_start > $range_end) {
	unset($events[$key]);
	}
	}

	return $events;
	}

	}
	diff --git a/src/applications/calendar/storage/PhabricatorCalendarEvent.php b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	index 2ddc71115f..8d93e839f2 100644
	--- a/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	+++ b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	@@ -1,1062 +1,1033 @@
	<?php

	final class PhabricatorCalendarEvent extends PhabricatorCalendarDAO
	implements
	PhabricatorPolicyInterface,
	PhabricatorProjectInterface,
	PhabricatorMarkupInterface,
	PhabricatorApplicationTransactionInterface,
	PhabricatorSubscribableInterface,
	PhabricatorTokenReceiverInterface,
	PhabricatorDestructibleInterface,
	PhabricatorMentionableInterface,
	PhabricatorFlaggableInterface,
	PhabricatorSpacesInterface,
	PhabricatorFulltextInterface,
	PhabricatorConduitResultInterface {

	protected $name;
	protected $hostPHID;
	- protected $dateFrom;
	- protected $dateTo;
	- protected $allDayDateFrom;
	- protected $allDayDateTo;
	protected $description;
	protected $isCancelled;
	protected $isAllDay;
	protected $icon;
	protected $mailKey;
	protected $isStub;

	protected $isRecurring = 0;
	protected $recurrenceFrequency = array();
	- protected $recurrenceEndDate;

	private $isGhostEvent = false;
	protected $instanceOfEventPHID;
	protected $sequenceIndex;

	protected $viewPolicy;
	protected $editPolicy;

	protected $spacePHID;

	protected $utcInitialEpoch;
	protected $utcUntilEpoch;
	protected $utcInstanceEpoch;
	protected $parameters = array();

	private $parentEvent = self::ATTACHABLE;
	private $invitees = self::ATTACHABLE;

	private $viewerTimezone;

	+ // TODO: DEPRECATED. Remove once we're sure the migrations worked.
	+ protected $allDayDateFrom;
	+ protected $allDayDateTo;
	+ protected $dateFrom;
	+ protected $dateTo;
	+ protected $recurrenceEndDate;
	+
	// Frequency Constants
	const FREQUENCY_DAILY = 'daily';
	const FREQUENCY_WEEKLY = 'weekly';
	const FREQUENCY_MONTHLY = 'monthly';
	const FREQUENCY_YEARLY = 'yearly';

	public static function initializeNewCalendarEvent(PhabricatorUser $actor) {
	$app = id(new PhabricatorApplicationQuery())
	->setViewer($actor)
	->withClasses(array('PhabricatorCalendarApplication'))
	->executeOne();

	$view_default = PhabricatorCalendarEventDefaultViewCapability::CAPABILITY;
	$edit_default = PhabricatorCalendarEventDefaultEditCapability::CAPABILITY;
	$view_policy = $app->getPolicy($view_default);
	$edit_policy = $app->getPolicy($edit_default);

	$now = PhabricatorTime::getNow();

	- $start = new DateTime('@'.$now);
	- $start->setTimeZone($actor->getTimeZone());
	-
	- $start->setTime($start->format('H'), 0, 0);
	- $start->modify('+1 hour');
	- $end = id(clone $start)->modify('+1 hour');
	-
	- $epoch_min = $start->format('U');
	- $epoch_max = $end->format('U');
	-
	- $now_date = new DateTime('@'.$now);
	- $now_min = id(clone $now_date)->setTime(0, 0)->format('U');
	- $now_max = id(clone $now_date)->setTime(23, 59)->format('U');
	-
	$default_icon = 'fa-calendar';

	$datetime_start = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	$now,
	$actor->getTimezoneIdentifier());
	$datetime_end = $datetime_start->newRelativeDateTime('PT1H');

	return id(new PhabricatorCalendarEvent())
	->setHostPHID($actor->getPHID())
	->setIsCancelled(0)
	->setIsAllDay(0)
	->setIsStub(0)
	->setIsRecurring(0)
	->setRecurrenceFrequency(
	array(
	'rule' => self::FREQUENCY_WEEKLY,
	))
	->setIcon($default_icon)
	->setViewPolicy($view_policy)
	->setEditPolicy($edit_policy)
	->setSpacePHID($actor->getDefaultSpacePHID())
	->attachInvitees(array())
	- ->setDateFrom($epoch_min)
	- ->setDateTo($epoch_max)
	- ->setAllDayDateFrom($now_min)
	- ->setAllDayDateTo($now_max)
	+ ->setDateFrom(0)
	+ ->setDateTo(0)
	+ ->setAllDayDateFrom(0)
	+ ->setAllDayDateTo(0)
	->setStartDateTime($datetime_start)
	->setEndDateTime($datetime_end)
	->applyViewerTimezone($actor);
	}

	private function newChild(PhabricatorUser $actor, $sequence) {
	if (!$this->isParentEvent()) {
	throw new Exception(
	pht(
	'Unable to generate a new child event for an event which is not '.
	'a recurring parent event!'));
	}

	$child = id(new self())
	->setIsCancelled(0)
	->setIsStub(0)
	->setInstanceOfEventPHID($this->getPHID())
	->setSequenceIndex($sequence)
	->setIsRecurring(true)
	->setRecurrenceFrequency($this->getRecurrenceFrequency())
	- ->attachParentEvent($this);
	+ ->attachParentEvent($this)
	+ ->setAllDayDateFrom(0)
	+ ->setAllDayDateTo(0)
	+ ->setDateFrom(0)
	+ ->setDateTo(0);

	return $child->copyFromParent($actor);
	}

	protected function readField($field) {
	static $inherit = array(
	'hostPHID' => true,
	'isAllDay' => true,
	'icon' => true,
	'spacePHID' => true,
	'viewPolicy' => true,
	'editPolicy' => true,
	'name' => true,
	'description' => true,
	);

	// Read these fields from the parent event instead of this event. For
	// example, we want any changes to the parent event's name to apply to
	// the child.
	if (isset($inherit[$field])) {
	if ($this->getIsStub()) {
	// TODO: This should be unconditional, but the execution order of
	// CalendarEventQuery and applyViewerTimezone() are currently odd.
	if ($this->parentEvent !== self::ATTACHABLE) {
	return $this->getParentEvent()->readField($field);
	}
	}
	}

	return parent::readField($field);
	}


	public function copyFromParent(PhabricatorUser $actor) {
	if (!$this->isChildEvent()) {
	throw new Exception(
	pht(
	'Unable to copy from parent event: this is not a child event.'));
	}

	$parent = $this->getParentEvent();

	$this
	->setHostPHID($parent->getHostPHID())
	->setIsAllDay($parent->getIsAllDay())
	->setIcon($parent->getIcon())
	->setSpacePHID($parent->getSpacePHID())
	->setViewPolicy($parent->getViewPolicy())
	->setEditPolicy($parent->getEditPolicy())
	->setName($parent->getName())
	->setDescription($parent->getDescription());

	$sequence = $this->getSequenceIndex();
	$duration = $parent->getDuration();
	$epochs = $parent->getSequenceIndexEpochs($actor, $sequence, $duration);

	+ $start_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	+ $epochs['dateFrom'],
	+ $parent->newStartDateTime()->getTimezone());
	+ $end_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	+ $epochs['dateTo'],
	+ $parent->newEndDateTime()->getTimezone());
	+
	$this
	- ->setDateFrom($epochs['dateFrom'])
	- ->setDateTo($epochs['dateTo'])
	- ->setAllDayDateFrom($epochs['allDayDateFrom'])
	- ->setAllDayDateTo($epochs['allDayDateTo']);
	+ ->setStartDateTime($start_datetime)
	+ ->setEndDateTime($end_datetime);

	return $this;
	}

	public function isValidSequenceIndex(PhabricatorUser $viewer, $sequence) {
	try {
	$this->getSequenceIndexEpochs($viewer, $sequence, $this->getDuration());
	return true;
	} catch (Exception $ex) {
	return false;
	}
	}

	private function getSequenceIndexEpochs(
	PhabricatorUser $viewer,
	$sequence,
	$duration) {

	$frequency = $this->getFrequencyUnit();
	$modify_key = '+'.$sequence.' '.$frequency;

	- $date = $this->getDateFrom();
	- $date_time = PhabricatorTime::getDateTimeFromEpoch($date, $viewer);
	+ $date_time = $this->newStartDateTime()
	+ ->setViewerTimezone($viewer->getTimezoneIdentifier())
	+ ->newPHPDateTime();
	+
	$date_time->modify($modify_key);
	$date = $date_time->format('U');

	- $end_date = $this->getRecurrenceEndDate();
	+ $end_date = $this->getUntilDateTimeEpoch();
	if ($end_date && $date > $end_date) {
	throw new Exception(
	pht(
	'Sequence "%s" is invalid for this event: it would occur after '.
	'the event stops repeating.',
	$sequence));
	}

	- $utc = new DateTimeZone('UTC');
	-
	- $allday_from = $this->getAllDayDateFrom();
	- $allday_date = new DateTime('@'.$allday_from, $utc);
	- $allday_date->setTimeZone($utc);
	- $allday_date->modify($modify_key);
	-
	- $allday_min = $allday_date->format('U');
	- $allday_duration = ($this->getAllDayDateTo() - $allday_from);
	-
	return array(
	'dateFrom' => $date,
	'dateTo' => $date + $duration,
	- 'allDayDateFrom' => $allday_min,
	- 'allDayDateTo' => $allday_min + $allday_duration,
	);
	}

	public function newStub(PhabricatorUser $actor, $sequence) {
	$stub = $this->newChild($actor, $sequence);

	$stub->setIsStub(1);

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$stub->save();
	unset($unguarded);

	$stub->applyViewerTimezone($actor);

	return $stub;
	}

	public function newGhost(PhabricatorUser $actor, $sequence) {
	$ghost = $this->newChild($actor, $sequence);

	$ghost
	->setIsGhostEvent(true)
	->makeEphemeral();

	$ghost->applyViewerTimezone($actor);

	return $ghost;
	}

	public function applyViewerTimezone(PhabricatorUser $viewer) {
	$this->viewerTimezone = $viewer->getTimezoneIdentifier();
	return $this;
	}

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

	- public function getDateEpochForTimezone(
	- $epoch,
	- $src_zone,
	- $format,
	- $adjust,
	- $dst_zone) {
	-
	- $src = new DateTime('@'.$epoch);
	- $src->setTimeZone($src_zone);
	-
	- if (strlen($adjust)) {
	- $adjust = ' '.$adjust;
	- }
	-
	- $dst = new DateTime($src->format($format).$adjust, $dst_zone);
	- return $dst->format('U');
	- }
	-
	public function updateUTCEpochs() {
	// The "intitial" epoch is the start time of the event, in UTC.
	$start_date = $this->newStartDateTime()
	->setViewerTimezone('UTC');
	$start_epoch = $start_date->getEpoch();
	$this->setUTCInitialEpoch($start_epoch);

	// The "until" epoch is the last UTC epoch on which any instance of this
	// event occurs. For infinitely recurring events, it is `null`.

	if (!$this->getIsRecurring()) {
	$end_date = $this->newEndDateTime()
	->setViewerTimezone('UTC');
	$until_epoch = $end_date->getEpoch();
	} else {
	$until_epoch = null;
	- $until_date = $this->newUntilDateTime()
	- ->setViewerTimezone('UTC');
	+ $until_date = $this->newUntilDateTime();
	if ($until_date) {
	+ $until_date->setViewerTimezone('UTC');
	$duration = $this->newDuration();
	$until_epoch = id(new PhutilCalendarRelativeDateTime())
	->setOrigin($until_date)
	->setDuration($duration)
	->getEpoch();
	}
	}
	$this->setUTCUntilEpoch($until_epoch);

	// The "instance" epoch is a property of instances of recurring events.
	// It's the original UTC epoch on which the instance started. Usually that
	// is the same as the start date, but they may be different if the instance
	// has been edited.

	// The ICS format uses this value (original start time) to identify event
	// instances, and must do so because it allows additional arbitrary
	// instances to be added (with "RDATE").

	$instance_epoch = null;
	$instance_date = $this->newInstanceDateTime();
	if ($instance_date) {
	$instance_epoch = $instance_date
	->setViewerTimezone('UTC')
	->getEpoch();
	}
	$this->setUTCInstanceEpoch($instance_epoch);

	return $this;
	}

	public function save() {
	if (!$this->mailKey) {
	$this->mailKey = Filesystem::readRandomCharacters(20);
	}

	$this->updateUTCEpochs();

	return parent::save();
	}

	/**
	* Get the event start epoch for evaluating invitee availability.
	*
	* When assessing availability, we pretend events start earlier than they
	* really do. This allows us to mark users away for the entire duration of a
	* series of back-to-back meetings, even if they don't strictly overlap.
	*
	* @return int Event start date for availability caches.
	*/
	public function getStartDateTimeEpochForCache() {
	$epoch = $this->getStartDateTimeEpoch();
	$window = phutil_units('15 minutes in seconds');
	return ($epoch - $window);
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_COLUMN_SCHEMA => array(
	'name' => 'text',
	- 'dateFrom' => 'epoch',
	- 'dateTo' => 'epoch',
	- 'allDayDateFrom' => 'epoch',
	- 'allDayDateTo' => 'epoch',
	'description' => 'text',
	'isCancelled' => 'bool',
	'isAllDay' => 'bool',
	'icon' => 'text32',
	'mailKey' => 'bytes20',
	'isRecurring' => 'bool',
	- 'recurrenceEndDate' => 'epoch?',
	'instanceOfEventPHID' => 'phid?',
	'sequenceIndex' => 'uint32?',
	'isStub' => 'bool',
	'utcInitialEpoch' => 'epoch',
	'utcUntilEpoch' => 'epoch?',
	'utcInstanceEpoch' => 'epoch?',
	+
	+ // TODO: DEPRECATED.
	+ 'allDayDateFrom' => 'epoch',
	+ 'allDayDateTo' => 'epoch',
	+ 'dateFrom' => 'epoch',
	+ 'dateTo' => 'epoch',
	+ 'recurrenceEndDate' => 'epoch?',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_date' => array(
	'columns' => array('dateFrom', 'dateTo'),
	),
	'key_instance' => array(
	'columns' => array('instanceOfEventPHID', 'sequenceIndex'),
	'unique' => true,
	),
	'key_epoch' => array(
	'columns' => array('utcInitialEpoch', 'utcUntilEpoch'),
	),
	'key_rdate' => array(
	'columns' => array('instanceOfEventPHID', 'utcInstanceEpoch'),
	'unique' => true,
	),
	),
	self::CONFIG_SERIALIZATION => array(
	'recurrenceFrequency' => self::SERIALIZATION_JSON,
	'parameters' => self::SERIALIZATION_JSON,
	),
	) + parent::getConfiguration();
	}

	public function generatePHID() {
	return PhabricatorPHID::generateNewPHID(
	PhabricatorCalendarEventPHIDType::TYPECONST);
	}

	public function getMonogram() {
	return 'E'.$this->getID();
	}

	public function getInvitees() {
	return $this->assertAttached($this->invitees);
	}

	public function attachInvitees(array $invitees) {
	$this->invitees = $invitees;
	return $this;
	}

	public function getInviteePHIDsForEdit() {
	$invitees = array();

	foreach ($this->getInvitees() as $invitee) {
	if ($invitee->isUninvited()) {
	continue;
	}
	$invitees[] = $invitee->getInviteePHID();
	}

	return $invitees;
	}

	public function getUserInviteStatus($phid) {
	$invitees = $this->getInvitees();
	$invitees = mpull($invitees, null, 'getInviteePHID');

	$invited = idx($invitees, $phid);
	if (!$invited) {
	return PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
	}
	$invited = $invited->getStatus();
	return $invited;
	}

	public function getIsUserAttending($phid) {
	$attending_status = PhabricatorCalendarEventInvitee::STATUS_ATTENDING;

	$old_status = $this->getUserInviteStatus($phid);
	$is_attending = ($old_status == $attending_status);

	return $is_attending;
	}

	public function getIsUserInvited($phid) {
	$uninvited_status = PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
	$declined_status = PhabricatorCalendarEventInvitee::STATUS_DECLINED;
	$status = $this->getUserInviteStatus($phid);
	if ($status == $uninvited_status \|\| $status == $declined_status) {
	return false;
	}
	return true;
	}

	public function getIsGhostEvent() {
	return $this->isGhostEvent;
	}

	public function setIsGhostEvent($is_ghost_event) {
	$this->isGhostEvent = $is_ghost_event;
	return $this;
	}

	public function getFrequencyRule() {
	return idx($this->recurrenceFrequency, 'rule');
	}

	public function getFrequencyUnit() {
	$frequency = $this->getFrequencyRule();

	switch ($frequency) {
	case 'daily':
	return 'day';
	case 'weekly':
	return 'week';
	case 'monthly':
	return 'month';
	case 'yearly':
	return 'year';
	default:
	return 'day';
	}
	}

	public function getURI() {
	if ($this->getIsGhostEvent()) {
	$base = $this->getParentEvent()->getURI();
	$sequence = $this->getSequenceIndex();
	return "{$base}/{$sequence}/";
	}

	return '/'.$this->getMonogram();
	}

	public function getParentEvent() {
	return $this->assertAttached($this->parentEvent);
	}

	public function attachParentEvent($event) {
	$this->parentEvent = $event;
	return $this;
	}

	public function isParentEvent() {
	return ($this->getIsRecurring() && !$this->getInstanceOfEventPHID());
	}

	public function isChildEvent() {
	return ($this->instanceOfEventPHID !== null);
	}

	public function isCancelledEvent() {
	if ($this->getIsCancelled()) {
	return true;
	}

	if ($this->isChildEvent()) {
	if ($this->getParentEvent()->getIsCancelled()) {
	return true;
	}
	}

	return false;
	}

	public function renderEventDate(
	PhabricatorUser $viewer,
	$show_end) {

	$start = $this->newStartDateTime();
	$end = $this->newEndDateTime();

	if ($show_end) {
	$min_date = $start->newPHPDateTime();
	$max_date = $end->newPHPDateTime();

	$min_day = $min_date->format('Y m d');
	$max_day = $max_date->format('Y m d');

	$show_end_date = ($min_day != $max_day);
	} else {
	$show_end_date = false;
	}

	$min_epoch = $start->getEpoch();
	$max_epoch = $end->getEpoch();

	if ($this->getIsAllDay()) {
	if ($show_end_date) {
	return pht(
	'%s - %s, All Day',
	phabricator_date($min_epoch, $viewer),
	phabricator_date($max_epoch, $viewer));
	} else {
	return pht(
	'%s, All Day',
	phabricator_date($min_epoch, $viewer));
	}
	} else if ($show_end_date) {
	return pht(
	'%s - %s',
	phabricator_datetime($min_epoch, $viewer),
	phabricator_datetime($max_epoch, $viewer));
	} else if ($show_end) {
	return pht(
	'%s - %s',
	phabricator_datetime($min_epoch, $viewer),
	phabricator_time($max_epoch, $viewer));
	} else {
	return pht(
	'%s',
	phabricator_datetime($min_epoch, $viewer));
	}
	}


	public function getDisplayIcon(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return 'fa-times';
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return 'fa-check-circle';
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return 'fa-user-plus';
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return 'fa-times';
	}
	}

	return $this->getIcon();
	}

	public function getDisplayIconColor(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return 'red';
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return 'green';
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return 'green';
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return 'grey';
	}
	}

	return 'bluegrey';
	}

	public function getDisplayIconLabel(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return pht('Cancelled');
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return pht('Attending');
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return pht('Invited');
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return pht('Declined');
	}
	}

	return null;
	}

	public function getICSFilename() {
	return $this->getMonogram().'.ics';
	}

	public function newIntermediateEventNode(PhabricatorUser $viewer) {
	$base_uri = new PhutilURI(PhabricatorEnv::getProductionURI('/'));
	$domain = $base_uri->getDomain();

	$uid = $this->getPHID().'@'.$domain;

	$created = $this->getDateCreated();
	$created = PhutilCalendarAbsoluteDateTime::newFromEpoch($created);

	$modified = $this->getDateModified();
	$modified = PhutilCalendarAbsoluteDateTime::newFromEpoch($modified);

	$date_start = $this->newStartDateTime();
	$date_end = $this->newEndDateTime();

	if ($this->getIsAllDay()) {
	$date_start->setIsAllDay(true);
	$date_end->setIsAllDay(true);
	}

	$host_phid = $this->getHostPHID();

	$invitees = $this->getInvitees();
	foreach ($invitees as $key => $invitee) {
	if ($invitee->isUninvited()) {
	unset($invitees[$key]);
	}
	}

	$phids = array();
	$phids[] = $host_phid;
	foreach ($invitees as $invitee) {
	$phids[] = $invitee->getInviteePHID();
	}

	$handles = $viewer->loadHandles($phids);

	$host_handle = $handles[$host_phid];
	$host_name = $host_handle->getFullName();
	$host_uri = $host_handle->getURI();
	$host_uri = PhabricatorEnv::getURI($host_uri);

	$organizer = id(new PhutilCalendarUserNode())
	->setName($host_name)
	->setURI($host_uri);

	$attendees = array();
	foreach ($invitees as $invitee) {
	$invitee_phid = $invitee->getInviteePHID();
	$invitee_handle = $handles[$invitee_phid];
	$invitee_name = $invitee_handle->getFullName();
	$invitee_uri = $invitee_handle->getURI();
	$invitee_uri = PhabricatorEnv::getURI($invitee_uri);

	switch ($invitee->getStatus()) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	$status = PhutilCalendarUserNode::STATUS_ACCEPTED;
	break;
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	$status = PhutilCalendarUserNode::STATUS_DECLINED;
	break;
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	default:
	$status = PhutilCalendarUserNode::STATUS_INVITED;
	break;
	}

	$attendees[] = id(new PhutilCalendarUserNode())
	->setName($invitee_name)
	->setURI($invitee_uri)
	->setStatus($status);
	}

	$node = id(new PhutilCalendarEventNode())
	->setUID($uid)
	->setName($this->getName())
	->setDescription($this->getDescription())
	->setCreatedDateTime($created)
	->setModifiedDateTime($modified)
	->setStartDateTime($date_start)
	->setEndDateTime($date_end)
	->setOrganizer($organizer)
	->setAttendees($attendees);

	return $node;
	}

	public function newStartDateTime() {
	$datetime = $this->getParameter('startDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getDateFrom();
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getStartDateTimeEpoch() {
	return $this->newStartDateTime()->getEpoch();
	}

	public function newEndDateTime() {
	$datetime = $this->getParameter('endDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getDateTo();
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getEndDateTimeEpoch() {
	return $this->newEndDateTime()->getEpoch();
	}

	public function newUntilDateTime() {
	$datetime = $this->getParameter('untilDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getRecurrenceEndDate();
	if (!$epoch) {
	return null;
	}
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getUntilDateTimeEpoch() {
	$datetime = $this->newUntilDateTime();

	if (!$datetime) {
	return null;
	}

	return $datetime->getEpoch();
	}

	public function newDuration() {
	return id(new PhutilCalendarDuration())
	->setSeconds($this->getDuration());
	}

	public function newInstanceDateTime() {
	if (!$this->getIsRecurring()) {
	return null;
	}

	- $epochs = $this->getParent()->getSequenceIndexEpochs(
	+ $epochs = $this->getParentEvent()->getSequenceIndexEpochs(
	new PhabricatorUser(),
	$this->getSequenceIndex(),
	$this->getDuration());

	$epoch = $epochs['dateFrom'];
	return $this->newDateTimeFromEpoch($epoch);
	}

	private function newDateTimeFromEpoch($epoch) {
	$datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch($epoch);

	if ($this->getIsAllDay()) {
	$datetime->setIsAllDay(true);
	}

	return $this->newDateTimeFromDateTime($datetime);
	}

	private function newDateTimeFromDictionary(array $dict) {
	$datetime = PhutilCalendarAbsoluteDateTime::newFromDictionary($dict);
	return $this->newDateTimeFromDateTime($datetime);
	}

	private function newDateTimeFromDateTime(PhutilCalendarDateTime $datetime) {
	$viewer_timezone = $this->viewerTimezone;
	if ($viewer_timezone) {
	$datetime->setViewerTimezone($viewer_timezone);
	}

	return $datetime;
	}

	public function getParameter($key, $default = null) {
	return idx($this->parameters, $key, $default);
	}

	public function setParameter($key, $value) {
	$this->parameters[$key] = $value;
	return $this;
	}

	public function setStartDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'startDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	public function setEndDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'endDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	public function setUntilDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'untilDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	/* -( Markup Interface )--------------------------------------------------- */


	/**
	* @task markup
	*/
	public function getMarkupFieldKey($field) {
	$hash = PhabricatorHash::digest($this->getMarkupText($field));
	$id = $this->getID();
	return "calendar:T{$id}:{$field}:{$hash}";
	}


	/**
	* @task markup
	*/
	public function getMarkupText($field) {
	return $this->getDescription();
	}


	/**
	* @task markup
	*/
	public function newMarkupEngine($field) {
	return PhabricatorMarkupEngine::newCalendarMarkupEngine();
	}


	/**
	* @task markup
	*/
	public function didMarkupText(
	$field,
	$output,
	PhutilMarkupEngine $engine) {
	return $output;
	}


	/**
	* @task markup
	*/
	public function shouldUseMarkupCache($field) {
	return (bool)$this->getID();
	}

	/* -( PhabricatorPolicyInterface )----------------------------------------- */


	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	return $this->getViewPolicy();
	case PhabricatorPolicyCapability::CAN_EDIT:
	return $this->getEditPolicy();
	}
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	// The host of an event can always view and edit it.
	$user_phid = $this->getHostPHID();
	if ($user_phid) {
	$viewer_phid = $viewer->getPHID();
	if ($viewer_phid == $user_phid) {
	return true;
	}
	}

	if ($capability == PhabricatorPolicyCapability::CAN_VIEW) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	if ($status == PhabricatorCalendarEventInvitee::STATUS_INVITED \|\|
	$status == PhabricatorCalendarEventInvitee::STATUS_ATTENDING \|\|
	$status == PhabricatorCalendarEventInvitee::STATUS_DECLINED) {
	return true;
	}
	}

	return false;
	}

	public function describeAutomaticCapability($capability) {
	return pht(
	'The host of an event can always view and edit it. Users who are '.
	'invited to an event can always view it.');
	}


	/* -( PhabricatorApplicationTransactionInterface )------------------------- */


	public function getApplicationTransactionEditor() {
	return new PhabricatorCalendarEventEditor();
	}

	public function getApplicationTransactionObject() {
	return $this;
	}

	public function getApplicationTransactionTemplate() {
	return new PhabricatorCalendarEventTransaction();
	}

	public function willRenderTimeline(
	PhabricatorApplicationTransactionView $timeline,
	AphrontRequest $request) {

	return $timeline;
	}

	/* -( PhabricatorSubscribableInterface )----------------------------------- */


	public function isAutomaticallySubscribed($phid) {
	return ($phid == $this->getHostPHID());
	}

	/* -( PhabricatorTokenReceiverInterface )---------------------------------- */


	public function getUsersToNotifyOfTokenGiven() {
	return array($this->getHostPHID());
	}

	/* -( PhabricatorDestructibleInterface )----------------------------------- */


	public function destroyObjectPermanently(
	PhabricatorDestructionEngine $engine) {

	$this->openTransaction();
	$this->delete();
	$this->saveTransaction();
	}

	/* -( PhabricatorSpacesInterface )----------------------------------------- */


	public function getSpacePHID() {
	return $this->spacePHID;
	}


	/* -( PhabricatorFulltextInterface )--------------------------------------- */


	public function newFulltextEngine() {
	return new PhabricatorCalendarEventFulltextEngine();
	}


	/* -( PhabricatorConduitResultInterface )---------------------------------- */


	public function getFieldSpecificationsForConduit() {
	return array(
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('name')
	->setType('string')
	->setDescription(pht('The name of the event.')),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('description')
	->setType('string')
	->setDescription(pht('The event description.')),
	);
	}

	public function getFieldValuesForConduit() {
	return array(
	'name' => $this->getName(),
	'description' => $this->getDescription(),
	);
	}

	public function getConduitSearchAttachments() {
	return array();
	}

	}
	diff --git a/src/applications/calendar/xaction/PhabricatorCalendarEventEndDateTransaction.php b/src/applications/calendar/xaction/PhabricatorCalendarEventEndDateTransaction.php
	index 2d5f10d290..a0d127c32f 100644
	--- a/src/applications/calendar/xaction/PhabricatorCalendarEventEndDateTransaction.php
	+++ b/src/applications/calendar/xaction/PhabricatorCalendarEventEndDateTransaction.php
	@@ -1,54 +1,44 @@
	<?php

	final class PhabricatorCalendarEventEndDateTransaction
	extends PhabricatorCalendarEventDateTransaction {

	const TRANSACTIONTYPE = 'calendar.enddate';

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

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

	- // TODO: DEPRECATED.
	- $object->setDateTo($value);
	- $object->setAllDayDateTo(
	- $object->getDateEpochForTimezone(
	- $value,
	- $actor->getTimeZone(),
	- 'Y-m-d 23:59:00',
	- null,
	- new DateTimeZone('UTC')));
	-
	$datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	$value,
	$actor->getTimezoneIdentifier());
	$datetime->setIsAllDay($object->getIsAllDay());
	$object->setEndDateTime($datetime);
	}

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

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

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

	}
	diff --git a/src/applications/calendar/xaction/PhabricatorCalendarEventStartDateTransaction.php b/src/applications/calendar/xaction/PhabricatorCalendarEventStartDateTransaction.php
	index 48318edf7e..e08bbac780 100644
	--- a/src/applications/calendar/xaction/PhabricatorCalendarEventStartDateTransaction.php
	+++ b/src/applications/calendar/xaction/PhabricatorCalendarEventStartDateTransaction.php
	@@ -1,54 +1,44 @@
	<?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();

	- // TODO: DEPRECATED.
	- $object->setDateFrom($value);
	- $object->setAllDayDateFrom(
	- $object->getDateEpochForTimezone(
	- $value,
	- $actor->getTimeZone(),
	- 'Y-m-d',
	- null,
	- new DateTimeZone('UTC')));
	-
	$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.');
	}

	}

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