convert timesheets to UTC with support for user timezone (#372)

src/EventSubscriber/TimezoneSubscriber.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use App\Entity\User;
+use KevinPapst\AdminLTEBundle\Event\ShowUserEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
+
+class TimezoneSubscriber implements EventSubscriberInterface
+{
+    /**
+     * @var TokenStorageInterface
+     */
+    protected $storage;
+
+    /**
+     * @param TokenStorageInterface $tokenStorage
+     */
+    public function __construct(TokenStorageInterface $tokenStorage)
+    {
+        $this->storage = $tokenStorage;
+    }
+
+    /**
+     * @return array
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            KernelEvents::REQUEST => ['setTimezone', 100],
+        ];
+    }
+
+    /**
+     * @param ShowUserEvent $event
+     */
+    public function setTimezone(GetResponseEvent $event)
+    {
+        if (null === $this->storage->getToken()) {
+            return;
+        }
+
+        /* @var $user User */
+        $user = $this->storage->getToken()->getUser();
+        $timezone = $user->getPreferenceValue('timezone', date_default_timezone_get());
+        date_default_timezone_set($timezone);
+    }
+}