* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Intl\DateFormatter\DateFormat; use Symfony\Component\Intl\Exception\NotImplementedException; /** * Parser and formatter for time zone format. * * @author Igor Wiedler * * @internal */ class TimezoneTransformer extends Transformer { /** * {@inheritdoc} * * @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); } /** * {@inheritdoc} */ public function getReverseMatchingRegExp(int $length): string { return 'GMT[+-]\d{2}:?\d{2}'; } /** * {@inheritdoc} */ 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[+-])(?P\d{2}):?(?P\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)); } }