DateValidator.php

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<?php
namespace TYPO3\CMS\Form\Validation;

class DateValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_date';

    protected $format;

    public function __construct($arguments) {
        $this->setFormat($arguments['format']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $value = $this->requestHandler->getByMethod($this->fieldName);
            if (function_exists('strptime')) {
                $parsedDate = strptime($value, $this->format);
                $parsedDateYear = $parsedDate['tm_year'] + 1900;
                $parsedDateMonth = $parsedDate['tm_mon'] + 1;
                $parsedDateDay = $parsedDate['tm_mday'];
                return checkdate($parsedDateMonth, $parsedDateDay, $parsedDateYear);
            } else {
                // %a => D : An abbreviated textual representation of the day (conversion works only for english)
                // %A => l : A full textual representation of the day (conversion works only for english)
                // %d => d : Day of the month, 2 digits with leading zeros
                // %e => j : Day of the month, 2 digits without leading zeros
                // %j => z : Day of the year, 3 digits with leading zeros
                // %b => M : Abbreviated month name, based on the locale (conversion works only for english)
                // %B => F : Full month name, based on the locale (conversion works only for english)
                // %h => M : Abbreviated month name, based on the locale (an alias of %b) (conversion works only for english)
                // %m => m : Two digit representation of the month
                // %y => y : Two digit representation of the year
                // %Y => Y : Four digit representation for the year
                $dateTimeFormat = str_replace(
                    array('%a', '%A', '%d', '%e', '%j', '%b', '%B', '%h', '%m', '%y', '%Y'),
                    array('D', 'l', 'd', 'j', 'z', 'M', 'F', 'M', 'm', 'y', 'Y'),
                    $this->format
                );
                $dateTimeObject = date_create_from_format($dateTimeFormat, $value);
                if ($dateTimeObject === FALSE) {
                    return FALSE;
                }

                return $value === $dateTimeObject->format($dateTimeFormat);
            }
        }
        return TRUE;
    }

    public function setFormat($format) {
        if ($format === NULL) {
            $this->format = '%e-%m-%Y';
        } else {
            $this->format = (string) $format;
        }
        return $this;
    }

    protected function substituteValues($message) {
        $humanReadableDateFormat = $this->humanReadableDateFormat($this->format);
        $message = str_replace('%format', $humanReadableDateFormat, $message);
        return $message;
    }

    protected function humanReadableDateFormat($format) {
        $label = self::LOCALISATION_OBJECT_NAME . '.strftime.';
        $pairs = array(
            '%A' => $this->localizationHandler->getLocalLanguageLabel($label . 'A'),
            '%a' => $this->localizationHandler->getLocalLanguageLabel($label . 'a'),
            '%d' => $this->localizationHandler->getLocalLanguageLabel($label . 'd'),
            '%e' => $this->localizationHandler->getLocalLanguageLabel($label . 'e'),
            '%B' => $this->localizationHandler->getLocalLanguageLabel($label . 'B'),
            '%b' => $this->localizationHandler->getLocalLanguageLabel($label . 'b'),
            '%m' => $this->localizationHandler->getLocalLanguageLabel($label . 'm'),
            '%Y' => $this->localizationHandler->getLocalLanguageLabel($label . 'Y'),
            '%y' => $this->localizationHandler->getLocalLanguageLabel($label . 'y'),
            '%H' => $this->localizationHandler->getLocalLanguageLabel($label . 'H'),
            '%I' => $this->localizationHandler->getLocalLanguageLabel($label . 'I'),
            '%M' => $this->localizationHandler->getLocalLanguageLabel($label . 'M'),
            '%S' => $this->localizationHandler->getLocalLanguageLabel($label . 'S')
        );
        $humanReadableFormat = str_replace(array_keys($pairs), array_values($pairs), $format);
        return $humanReadableFormat;
    }

}