ConpherenceTimeUtil.php
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	<?php

	final class ConpherenceTimeUtil {

	public static function getCalendarEventEpochs(
	PhabricatorUser $user,
	$start_day_str = 'Sunday') {

	$objects = self::getStartDateTimeObjects($user, $start_day_str);
	$start_day = $objects['start_day'];
	$end_day = clone $start_day;
	$end_day->modify('+9 days');

	return array(
	'start_epoch' => $start_day->format('U'),
	'end_epoch' => $end_day->format('U'));
	}

	public static function getCalendarWidgetTimestamps(
	PhabricatorUser $user,
	$start_day_str = 'Sunday') {

	$objects = self::getStartDateTimeObjects($user, $start_day_str);
	$start_day = $objects['start_day'];
	$timestamps = array();
	for ($day = 0; $day < 9; $day++) {
	$timestamp = clone $start_day;
	$timestamp->modify(sprintf('+%d days', $day));
	$timestamps[] = $timestamp;
	}
	return array(
	'today' => $objects['today'],
	'epoch_stamps' => $timestamps
	);
	}

	private static function getStartDateTimeObjects(
	PhabricatorUser $user,
	$start_day_str) {
	$timezone = new DateTimeZone($user->getTimezoneIdentifier());

	$today_epoch = PhabricatorTime::parseLocalTime('today', $user);
	$today = new DateTime('@'.$today_epoch);
	$today->setTimeZone($timezone);

	if ($today->format('l') == $start_day_str) {
	$start_day = clone $today;
	} else {
	$start_epoch = PhabricatorTime::parseLocalTime(
	'last '.$start_day_str,
	$user);
	$start_day = new DateTime('@'.$start_epoch);
	$start_day->setTimeZone($timezone);
	}
	return array(
	'today' => $today,
	'start_day' => $start_day);
	}

	}