Classes List

Symfony\Component\Intl\DateFormatter\DateFormat\TimezoneTransformer

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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\Component\Intl\DateFormatter\DateFormat;

use Symfony\Component\Intl\Exception\NotImplementedException;

/** * Parser and formatter for time zone format. * * @author Igor Wiedler <igor@wiedler.ch> * * @internal */
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(), 03);

        if (!in_array($timeZonearray('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($timeZonearray('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($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<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));
    }
}