Added draft for history

application/symfony/src/Attribut/TimestampAttribut.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Infinito\Attribut;
+
+use Infinito\Exception\AllreadySetException;
+
+/**
+ * @author kevinfrantz
+ *
+ * @see TimestampAttributInterface
+ */
+trait TimestampAttribut
+{
+    /**
+     * @var \DateTime
+     */
+    protected $timestamp;
+
+    /**
+     * @param \DateTime $datetime
+     */
+    public function setTimestamp(\DateTime $timestamp): void
+    {
+        if (isset($this->timestamp)) {
+            throw new AllreadySetException('The timestamp is allready set. An Update is not possible!');
+        }
+        $this->timestamp = $timestamp;
+    }
+
+    /**
+     * @return \DateTime
+     */
+    public function getTimestamp(): \DateTime
+    {
+        return $this->timestamp;
+    }
+}