PhabricatorTimezoneSetting.php
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	<?php

	final class PhabricatorTimezoneSetting
	extends PhabricatorOptionGroupSetting {

	const SETTINGKEY = 'timezone';

	public function getSettingName() {
	return pht('Timezone');
	}

	public function getSettingDefaultValue() {
	return date_default_timezone_get();
	}

	public function assertValidValue($value) {
	// NOTE: This isn't doing anything fancy, it's just a much faster
	// validator than doing all the timezone calculations to build the full
	// list of options.

	if (!$value) {
	return;
	}

	static $identifiers;
	if ($identifiers === null) {
	$identifiers = DateTimeZone::listIdentifiers();
	$identifiers = array_fuse($identifiers);
	}

	if (isset($identifiers[$value])) {
	return;
	}

	throw new Exception(
	pht(
	'Timezone "%s" is not a valid timezone identiifer.',
	$value));
	}

	protected function getSelectOptionGroups() {
	$timezones = DateTimeZone::listIdentifiers();
	$now = new DateTime('@'.PhabricatorTime::getNow());

	$groups = array();
	foreach ($timezones as $timezone) {
	$zone = new DateTimeZone($timezone);
	$offset = -($zone->getOffset($now) / (60 * 60));
	$groups[$offset][] = $timezone;
	}

	krsort($groups);

	$option_groups = array(
	array(
	'label' => pht('Default'),
	'options' => array(),
	),
	);

	foreach ($groups as $offset => $group) {
	if ($offset >= 0) {
	$label = pht('UTC-%d', $offset);
	} else {
	$label = pht('UTC+%d', -$offset);
	}

	sort($group);
	$option_groups[] = array(
	'label' => $label,
	'options' => array_fuse($group),
	);
	}

	return $option_groups;
	}

	}