Implemented the requested feature from calcifer:#29

src/enko/RelativeDateParser/DateTranslator.php

@@ -45,7 +45,7 @@ class DateTranslator {
         }
     }
 
-    public function translate($string) {
+    public function translate($string,$params = []) {
-        return $this->translator->trans($string);
+        return $this->translator->trans($string,$params);
     }
 }

src/enko/RelativeDateParser/RelativeDateParser.php

@@ -34,6 +34,12 @@ class RelativeDateParser {
             return $this;
         }
 
+        $success = preg_match(RelativeDateType3::getRegex(),$string,$match);
+        if ($success === 1) {
+            $this->datetype = new RelativeDateType3($match);
+            return $this;
+        }
+
         throw new \Exception('No DateType found.');
 
     }

src/enko/RelativeDateParser/RelativeDateType3.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: tim
+ * Date: 30.09.2014
+ * Time: 21:47
+ */
+
+namespace enko\RelativeDateParser;
+
+
+class RelativeDateType3 {
+    private $day = -1;
+
+    public static function getRegex() {
+        return DateTranslator::getInstance()->translate('/Jeder (\d+)\. Tag eines Monats/im');
+    }
+
+    private function getDay() {
+        return $this->day;
+    }
+
+    public function getCurrent(\DateTime $now) {
+        if ($this->day > cal_days_in_month(CAL_GREGORIAN,$now->format('m'),$now->format('Y'))) {
+            throw new \BadMethodCallException(DateTranslator::getInstance()->translate('Angegebener Tag ist nicht im Monat %date% enthalten.',['date' => $now->format('F Y')]));
+        }
+        $date = new \DateTime();
+        $date->setTimestamp (strtotime (sprintf ('%s %s %d', $this->getDay (), $now->format('F'), $now->format('Y'))));
+        $date->setTime($now->format('H'),$now->format('i'));
+
+        return $date;
+
+    }
+
+    public function getNext(\DateTime $now) {
+        $date = clone $now;
+        $date->add(\DateInterval::createFromDateString('+1 Month'));
+
+        return $this->getCurrent($date);
+    }
+
+    function __construct($data) {
+        $day = intval($data[1]);
+        if (is_integer($day)) {
+            $this->day = $day;
+        } else {
+            throw new \BadMethodCallException(DateTranslator::getInstance()->translate('Tag wurde nicht angegeben oder ist falsch.'));
+        }
+    }
+}