Show times for display timezone

In the dropdown menu in the rotation config form show times in the
display timezone in parentheses next to the normal time (schedule
timezone).

Author: jrauh01

application/controllers/ScheduleController.php

@@ -133,7 +133,7 @@ public function addRotationAction(): void
             $this->addContent(new TimezoneWarning($scheduleTimezone));
         }
 
-        $form = new RotationConfigForm($scheduleId, Database::get());
+        $form = new RotationConfigForm($scheduleId, Database::get(), $displayTimezone);
         $form->setAction($this->getRequest()->getUrl()->setParam('showCompact')->getAbsoluteUrl());
         $form->setSuggestionUrl(Url::fromPath('notifications/schedule/suggest-recipient'));
         $form->on(RotationConfigForm::ON_SENT, function ($form) {
@@ -173,7 +173,7 @@ public function editRotationAction(): void
             $this->addContent(new TimezoneWarning($scheduleTimezone));
         }
 
-        $form = new RotationConfigForm($scheduleId, Database::get());
+        $form = new RotationConfigForm($scheduleId, Database::get(), $displayTimezone);
         $form->disableModeSelection();
         $form->setShowRemoveButton();
         $form->loadRotation($id);

application/forms/RotationConfigForm.php

@@ -80,6 +80,9 @@ class RotationConfigForm extends CompatForm
     /** @var int The rotation id */
     protected $rotationId;
 
+    /** @var string The timezone to display the timeline in */
+    protected $displayTimezone;
+
     /**
      * Set the label for the submit button
      *
@@ -187,11 +190,13 @@ public function hasBeenWiped(): bool
      *
      * @param int $scheduleId
      * @param Connection $db
+     * @param string $displayTimezone
      */
-    public function __construct(int $scheduleId, Connection $db)
+    public function __construct(int $scheduleId, Connection $db, string $displayTimezone)
     {
         $this->db = $db;
         $this->scheduleId = $scheduleId;
+        $this->displayTimezone = $displayTimezone;
     }
 
     /**
@@ -1300,12 +1305,25 @@ private function getTimeOptions(): array
             \IntlDateFormatter::SHORT
         );
 
+        $dtzFormatter = new \IntlDateFormatter(
+            \Locale::getDefault(),
+            \IntlDateFormatter::NONE,
+            \IntlDateFormatter::SHORT,
+            $this->displayTimezone
+        );
+
         $options = [];
-        $dt = new DateTime();
+        $dt = new DateTime('now', new DateTimeZone($this->getScheduleTimezone()));
         for ($hour = 0; $hour < 24; $hour++) {
             for ($minute = 0; $minute < 60; $minute += 30) {
                 $dt->setTime($hour, $minute);
-                $options[$dt->format('H:i')] = $formatter->format($dt);
+                $dtzDt = (clone $dt)->setTimezone(new DateTimeZone($this->displayTimezone));
+
+                $options[$dt->format('H:i')] = sprintf(
+                    '%s (%s)',
+                    $formatter->format($dt),
+                    $dtzFormatter->format($dtzDt)
+                );
             }
         }