Lastmod.php

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<?php
#require_once 'Zend/Validate/Abstract.php';

class Zend_Validate_Sitemap_Lastmod extends Zend_Validate_Abstract
{
    const LASTMOD_REGEX = '/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])(T([0-1][0-9]|2[0-3])(:[0-5][0-9])(:[0-5][0-9])?(\\+|-)([0-1][0-9]|2[0-3]):[0-5][0-9])?$/';

    const NOT_VALID = 'sitemapLastmodNotValid';
    const INVALID   = 'sitemapLastmodInvalid';

    protected $_messageTemplates = array(
        self::NOT_VALID => "'%value%' is not a valid sitemap lastmod",
        self::INVALID   => "Invalid type given. String expected",
    );

    public function isValid($value)
    {
        if (!is_string($value)) {
            $this->_error(self::INVALID);
            return false;
        }

        $this->_setValue($value);
        $result = @preg_match(self::LASTMOD_REGEX, $value);
        if ($result != 1) {
            $this->_error(self::NOT_VALID);
            return false;
        }

        return true;
    }
}