feat: include optional time in transportation service

addresses #86996x46z

src/BusProNet/Utility/DayTimeUtility.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\BusProNet\Utility;
+
+class DayTimeUtility
+{
+    public function mapTime(?string $time): ?string
+    {
+        if (null === $time) {
+            return null;
+        } elseif ($time >= '00:00' && $time <= '05:59') {
+            return 'nachts';
+        } elseif ($time >= '06:00' && $time <= '11:59') {
+            return 'morgens';
+        } elseif ($time >= '12:00' && $time <= '14:59') {
+            return 'mittags';
+        } elseif ($time >= '15:00' && $time <= '19:59') {
+            return 'abends';
+        } elseif ($time >= '20:00' && $time <= '23:59') {
+            return 'nachts';
+        } else {
+            return null;
+        }
+    }
+}