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-- Example for an Extbase-Viewhelper
--
-- "NEM": Vendor Name 
-- "NemTourdates": Extension Name
-- See "ext_localconf.php" -> 
-- \TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin( 'NEM.' . $_EXTKEY, 'Tourdates', .. )
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-------------------------------------------------------------------------------------
-- PHP Class - File: nem_tourdates / Classes / ViewHelpers / DateViewHelper.php 
-------------------------------------------------------------------------------------

<?php
namespace NEM\NemTourdates\ViewHelpers;

class DateViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {
    
    /**
	* render
	*
	* returns a display value, computed from the data model
	*	@param \NEM\NemTourdates\Domain\Model\Date $date the date object
	* @param string $key 
	* @param array $settings
	* @return mixed
	* @author This Mächler <maechler@mm-computing.ch>
	*/
	public function render(\NEM\NemTourdates\Domain\Model\Date $date, $key, $settings=NULL) {
        .....
        .....
        return $result;
    }
    
}

--------------------------------------------------
-- Fluid - Template 
--------------------------------------------------

{namespace nem=NEM\NemTourdates\ViewHelpers}
...
...
{nem:date(date: date, key: 'date')}