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

src/EventSubscriber/UserPreferenceSubscriber.php

@@ -21,6 +21,7 @@ use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
 use Symfony\Component\Form\Extension\Core\Type\MoneyType;
+use Symfony\Component\Form\Extension\Core\Type\TimezoneType;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
 use Symfony\Component\Validator\Constraints\Range;
@@ -91,6 +92,11 @@ class UserPreferenceSubscriber implements EventSubscriberInterface
                 ->setEnabled($enableHourlyRate)
                 ->addConstraint(new Range(['min' => 0])),
 
+            (new UserPreference())
+                ->setName('timezone')
+                ->setValue(date_default_timezone_get())
+                ->setType(TimezoneType::class),
+
             (new UserPreference())
                 ->setName('language')
                 ->setValue('en')