PhabricatorTimezoneSetting.php
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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();
			}

			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;
			}

			}