Viewing file:  TimezoneTransformer.php (3.81 KB) -rw-r--r--
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Polyfill\Intl\Icu\DateFormat;
use Symfony\Polyfill\Intl\Icu\Exception\NotImplementedException;
/**
* Parser and formatter for time zone format.
*
* @author Igor Wiedler <igor@wiedler.ch>
*
* @internal
*/
class TimezoneTransformer extends Transformer
{
/**
* @throws NotImplementedException When time zone is different than UTC or GMT (Etc/GMT)
*/
public function format(\DateTime $dateTime, int $length): string
{
$timeZone = substr($dateTime->getTimezone()->getName(), 0, 3);
if (!\in_array($timeZone, ['Etc', 'UTC', 'GMT'])) {
throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.');
}
if ('Etc' === $timeZone) {
// i.e. Etc/GMT+1, Etc/UTC, Etc/Zulu
$timeZone = substr($dateTime->getTimezone()->getName(), 4);
}
// From ICU >= 59.1 GMT and UTC are no longer unified
if (\in_array($timeZone, ['UTC', 'UCT', 'Universal', 'Zulu'])) {
// offset is not supported with UTC
return $length > 3 ? 'Coordinated Universal Time' : 'UTC';
}
$offset = (int) $dateTime->format('O');
// From ICU >= 4.8, the zero offset is no more used, example: GMT instead of GMT+00:00
if (0 === $offset) {
return $length > 3 ? 'Greenwich Mean Time' : 'GMT';
}
if ($length > 3) {
return $dateTime->format('\G\M\TP');
}
return sprintf('GMT%s%d', $offset >= 0 ? '+' : '', $offset / 100);
}
public function getReverseMatchingRegExp(int $length): string
{
return 'GMT[+-]\d{2}:?\d{2}';
}
public function extractDateOptions(string $matched, int $length): array
{
return [
'timezone' => self::getEtcTimeZoneId($matched),
];
}
/**
* Get an Etc/GMT timezone identifier for the specified timezone.
*
* The PHP documentation for timezones states to not use the 'Other' time zones because them exists
* "for backwards compatibility". However all Etc/GMT time zones are in the tz database 'etcetera' file,
* which indicates they are not deprecated (neither are old names).
*
* Only GMT, Etc/Universal, Etc/Zulu, Etc/Greenwich, Etc/GMT-0, Etc/GMT+0 and Etc/GMT0 are old names and
* are linked to Etc/GMT or Etc/UTC.
*
* @param string $formattedTimeZone A GMT timezone string (GMT-03:00, e.g.)
*
* @return string A timezone identifier
*
* @see https://php.net/timezones.others
*
* @throws NotImplementedException When the GMT time zone have minutes offset different than zero
* @throws \InvalidArgumentException When the value can not be matched with pattern
*/
public static function getEtcTimeZoneId(string $formattedTimeZone): string
{
if (preg_match('/GMT(?P<signal>[+-])(?P<hours>\d{2}):?(?P<minutes>\d{2})/', $formattedTimeZone, $matches)) {
$hours = (int) $matches['hours'];
$minutes = (int) $matches['minutes'];
$signal = '-' === $matches['signal'] ? '+' : '-';
if (0 < $minutes) {
throw new NotImplementedException(sprintf('It is not possible to use a GMT time zone with minutes offset different than zero (0). GMT time zone tried: "%s".', $formattedTimeZone));
}
return 'Etc/GMT'.(0 !== $hours ? $signal.$hours : '');
}
throw new \InvalidArgumentException(sprintf('The GMT time zone "%s" does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.', $formattedTimeZone));
}
}
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