Example.html

{namespace vm=Vm\Vmtemplates\ViewHelpers}

<div class="navigation">
	<vm:link.next newsItem="{newsItem}" settings="{settings}" class="news-next">
		<span></span>
	</vm:link.next>
	<vm:link.prev newsItem="{newsItem}" settings="{settings}" class="news-prev">
		<span></span>
	</vm:link.prev>
</div>

LinkViewHelper.php

<?php
namespace Vm\Vmtemplates\ViewHelpers;

/*****************************************************************
 *  Copyright notice
 *
 *  (c) 2014 Benjamin Rau <rau@codearts.at>
 *
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 *****************************************************************/

/**
 * ViewHelper to render links for prev news
 */
class LinkViewHelper extends \Tx_News_ViewHelpers_LinkViewHelper {

	/**
	 * @var \Tx_News_Domain_Repository_NewsRepository
	 */
	protected $newsRepository;

	/**
	 * @var \Tx_News_Domain_Repository_NewsRepository $newsRepository
	 * @return void
	 */
	public function injectNewsRepository(\Tx_News_Domain_Repository_NewsRepository $newsRepository) {
		$this->newsRepository = $newsRepository;
	}

	/**
	 * Render link to news item or internal/external pages
	 *
	 * @param \Tx_News_Domain_Model_News $newsItem current news object
	 * @param array $settings
	 * @param boolean $uriOnly return only the url without the a-tag
	 * @param array $configuration optional typolink configuration
	 * @return string link
	 */
	public function render(\Tx_News_Domain_Model_News $newsItem, array $settings = array(), $uriOnly = FALSE, $configuration = array()) {
		$objectManager = \t3lib_div::makeInstance('Tx_Extbase_Object_ObjectManager');

		/** @var \Tx_Extbase_Persistence_Typo3QuerySettings $defaultQuerySettings */
		$defaultQuerySettings = $objectManager->get('Tx_Extbase_Persistence_Typo3QuerySettings');
		$defaultQuerySettings->setStoragePageIds(array($newsItem->getPid()));
		$this->newsRepository->setDefaultQuerySettings($defaultQuerySettings);

		$query = $this->newsRepository->createQuery();
		$newsItems = $query->execute()->toArray();

		$newsItemIndex = array_search($newsItem, $newsItems, TRUE);

		if (0 === (integer) array_search($newsItem, $newsItems, TRUE)) {
			return NULL;
		}

		$newsItem = $newsItems[$newsItemIndex-1];

		return parent::render($newsItem, $settings, $uriOnly, $configuration);
	}

}

NextViewHelper.php

<?php
namespace Vm\Vmtemplates\ViewHelpers\Link;

/*****************************************************************
 *  Copyright notice
 *
 *  (c) 2014 Benjamin Rau <rau@codearts.at>
 *
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 *****************************************************************/

use Vm\Vmtemplates\ViewHelpers\LinkViewHelper;
/**
 * ViewHelper to render links for prev news
 */
class NextViewHelper extends LinkViewHelper {

	/**
	 * @var \Tx_News_Domain_Repository_NewsRepository $newsRepository
	 * @return void
	 */
	public function injectNewsRepository(\Tx_News_Domain_Repository_NewsRepository $newsRepository) {
		$this->newsRepository = $newsRepository;
		$this->newsRepository->setDefaultOrderings(
			array('datetime' => \Tx_Extbase_Persistence_QueryInterface::ORDER_DESCENDING),
			array('tstamp' => \Tx_Extbase_Persistence_QueryInterface::ORDER_DESCENDING)
		);
	}

}

PrevViewHelper.php

<?php
namespace Vm\Vmtemplates\ViewHelpers\Link;

/*****************************************************************
 *  Copyright notice
 *
 *  (c) 2014 Benjamin Rau <rau@codearts.at>
 *
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 *****************************************************************/

use Vm\Vmtemplates\ViewHelpers\LinkViewHelper;
/**
 * ViewHelper to render links for prev news
 */
class PrevViewHelper extends LinkViewHelper {

	/**
	 * @var \Tx_News_Domain_Repository_NewsRepository $newsRepository
	 * @return void
	 */
	public function injectNewsRepository(\Tx_News_Domain_Repository_NewsRepository $newsRepository) {
		$this->newsRepository = $newsRepository;
		$this->newsRepository->setDefaultOrderings(
			array('datetime' => \Tx_Extbase_Persistence_QueryInterface::ORDER_ASCENDING),
			array('tstamp' => \Tx_Extbase_Persistence_QueryInterface::ORDER_ASCENDING)
		);
	}

}