* * 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 */ class TimeZoneTransformer extends Transformer { /** * {@inheritDoc} * * @throws NotImplementedException When time zone is different than UTC or GMT (Etc/GMT) */ public function format(\DateTime $dateTime, $length) { $timeZone = substr($dateTime->getTimezone()->getName(), 0, 3); if (!in_array($timeZone, array('Etc', 'UTC'))) { throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.'); } // From ICU >= 4.8, the zero offset is not more used, example: GMT instead of GMT+00:00 $format = (0 !== (int) $dateTime->format('O')) ? '\G\M\TP' : '\G\M\T'; return $dateTime->format($format); } /** * {@inheritDoc} */ public function getReverseMatchingRegExp($length) { return 'GMT[+-]\d{2}:?\d{2}'; } /** * {@inheritDoc} */ public function extractDateOptions($matched, $length) { return array( 'timezone' => self::getEtcTimeZoneId($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 $formattedTimeZone A GMT timezone string (GMT-03:00, e.g.) * * @return string A timezone identifier * * @see http://php.net/manual/en/timezones.others.php * @see http://www.twinsun.com/tz/tz-link.htm * * @throws NotImplementedException When the GMT time zone have minutes offset different than zero * @throws \InvalidArgumentException When the value can not be matched with pattern */ public static function getEtcTimeZoneId($formattedTimeZone) { 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.', $formattedTimeZone )); } return 'Etc/GMT'.($hours !== 0 ? $signal.$hours : ''); } throw new \InvalidArgumentException('The GMT time zone \'%s\' does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.'); } }