DateViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Format;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
use TYPO3\CMS\Core\Utility\MathUtility;

class DateViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $escapingInterceptorEnabled = FALSE;

    public function render($date = NULL, $format = '') {
        if ($format === '') {
            $format = $GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'] ?: 'Y-m-d';
        }

        if ($date === NULL) {
            $date = $this->renderChildren();
            if ($date === NULL) {
                return '';
            }
        }
        if (!$date instanceof \DateTime) {
            try {
                if (MathUtility::canBeInterpretedAsInteger($date)) {
                    $date = new \DateTime('@' . $date);
                } else {
                    $date = new \DateTime($date);
                }
                $date->setTimezone(new \DateTimeZone(date_default_timezone_get()));
            } catch (\Exception $exception) {
                throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('"' . $date . '" could not be parsed by \DateTime constructor.', 1241722579);
            }
        }

        if (strpos($format, '%') !== FALSE) {
            return strftime($format, $date->format('U'));
        } else {
            return $date->format($format);
        }

    }
}