Example on how to format date/time's correctly with locales using CLDR

README.md

Require the ICanBoogie/CLDR package:

composer require ICanBoogie/CLDR

Run on the command line, with:

php format.php [tzid] [locale]

Such as in:

• php format.php Europe/Oslo nl
• php format.php Asia/Shanghai en

format.php

<?php
require 'vendor/autoload.php';

use ICanBoogie\CLDR\Repository;
use ICanBoogie\CLDR\Cache\CacheCollection;
use ICanBoogie\CLDR\Cache\RuntimeCache;
use ICanBoogie\CLDR\Cache\FileCache;
use ICanBoogie\CLDR\Provider\CachedProvider;
use ICanBoogie\CLDR\Provider\WebProvider;

/* Input */
date_default_timezone_set($argv[1]);
$locale = $argv[2];
$datetime = new \DateTime;

/* Set up repo */
@mkdir('/tmp/cldr-cache');
$provider = new CachedProvider(
	new WebProvider,
	new CacheCollection([
		new RunTimeCache,
		new FileCache("/tmp/cldr-cache"),
	])
);

$repository = new Repository($provider);
$suppData = $repository->supplemental;

/* Get locale */
$locale = $repository->locales[$locale];

/* Extract TimeZone from object */
$tz = $datetime->getTimeZone()->getName();
$tzParts = explode('/', $tz);


/* Find MetaZone */
$metaZone = $suppData['metaZones']['metazoneInfo']['timezone'];
foreach ($tzParts as $tzPart) {
	$metaZone = $metaZone[$tzPart];
}


/* Pick the last one (not 100% correct, but will do) */
$standard = $daylight = '?';

$metaZone = $metaZone[count($metaZone)-1]['usesMetazone']['_mzone'];
$localeZone = $locale['timeZoneNames']['metazone'][$metaZone]['long'];
if (array_key_exists('standard', $localeZone)) {
	$standard = $localeZone['standard'];
}
if (array_key_exists('daylight', $localeZone)) {
	$daylight = $localeZone['daylight'];
}

/* Use locale to find override info */
$zone = $locale['timeZoneNames']['zone'];
foreach ($tzParts as $tzPart) {
	$zone = $zone[$tzPart];
}

if (array_key_exists('long', $zone) ) {
	foreach ($zone['long'] as $key => $value)
	{
		if ($key == 'standard') {
			$standard = $value;
		} else if ($key == 'daylight') {
			$daylight = $value;
		}
	}
}

/* Pick right value */
$tzDescription = $datetime->format('I') == 1 ? $daylight : $standard;

/* Format date */
$calendar = $locale->calendar;
$textDate = $datetime->format('Y-m-d H:i:s');
echo $calendar->format_date($textDate, 'long'), ' ', $calendar->format_time($textDate, 'medium'), ' ', $tzDescription, "\n";
?>