generate-timezone-map.php
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generate-timezone-map.php
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	#!/usr/bin/env php
	<?php

	$root = dirname(dirname(dirname(__FILE__)));
	require_once $root.'/scripts/init/init-script.php';

	$xml = $root.'/externals/cldr/cldr_windows_timezones.xml';
	$xml = Filesystem::readFile($xml);
	$xml = new SimpleXMLElement($xml);

	$result_map = array();

	$ignore = array(
	'UTC',
	'UTC-11',
	'UTC-02',
	'UTC-08',
	'UTC-09',
	'UTC+12',
	);
	$ignore = array_fuse($ignore);

	$zones = $xml->windowsZones->mapTimezones->mapZone;
	foreach ($zones as $zone) {
	$windows_name = (string)$zone['other'];
	$target_name = (string)$zone['type'];

	// Ignore the offset-based timezones from the CLDR map, since we handle
	// these later.
	if (isset($ignore[$windows_name])) {
	continue;
	}

	// We've already seen this timezone so we don't need to add it to the map
	// again.
	if (isset($result_map[$windows_name])) {
	continue;
	}

	$result_map[$windows_name] = $target_name;
	}

	asort($result_map);

	echo id(new PhutilJSON())
	->encodeFormatted($result_map);