diff --git a/application/controllers/ScheduleController.php b/application/controllers/ScheduleController.php
index 90b84ac6c..e2c8f9e40 100644
--- a/application/controllers/ScheduleController.php
+++ b/application/controllers/ScheduleController.php
@@ -11,7 +11,10 @@
 use Icinga\Module\Notifications\Forms\ScheduleForm;
 use Icinga\Module\Notifications\Model\Schedule;
 use Icinga\Module\Notifications\Widget\RecipientSuggestions;
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
+use Icinga\Module\Notifications\Web\Control\TimezonePicker;
 use Icinga\Module\Notifications\Widget\Detail\ScheduleDetail;
+use Icinga\Module\Notifications\Widget\TimezoneWarning;
 use ipl\Html\Form;
 use ipl\Html\Html;
 use ipl\Stdlib\Filter;
@@ -47,11 +50,24 @@ public function indexAction(): void
 
         $this->controls->addAttributes(['class' => 'schedule-detail-controls']);
 
+        $timezonePicker = $this->createTimezonePicker($schedule->timezone);
+        $this->controls->addHtml($timezonePicker);
+
         $scheduleControls = (new ScheduleDetail\Controls())
             ->setAction(Url::fromRequest()->getAbsoluteUrl())
             ->populate(['mode' => $this->params->get('mode')])
             ->on(Form::ON_SUCCESS, function (ScheduleDetail\Controls $controls) use ($id) {
-                $this->redirectNow(Links::schedule($id)->with(['mode' => $controls->getMode()]));
+                $redirectUrl = Links::schedule($id)->with(['mode' => $controls->getMode()]);
+                $requestUrl = Url::fromRequest();
+                if ($requestUrl->getParam('mode') !== $controls->getValue('mode')) {
+                    $defaultTimezoneParam = TimezonePicker::DEFAULT_TIMEZONE_PARAM;
+                    if ($requestUrl->hasParam($defaultTimezoneParam)) {
+                        $redirectUrl->addParams(
+                            [$defaultTimezoneParam => $requestUrl->getParam($defaultTimezoneParam)]
+                        );
+                    }
+                    $this->redirectNow($redirectUrl);
+                }
             })
             ->handleRequest($this->getServerRequest());
 
@@ -91,6 +107,7 @@ public function addAction(): void
     {
         $this->setTitle($this->translate('New Schedule'));
         $form = (new ScheduleForm(Database::get()))
+            ->setShowTimezoneDropdown()
             ->setAction($this->getRequest()->getUrl()->getAbsoluteUrl())
             ->on(Form::ON_SUCCESS, function (ScheduleForm $form) {
                 $scheduleId = $form->addSchedule();
@@ -107,9 +124,16 @@ public function addAction(): void
     public function addRotationAction(): void
     {
         $scheduleId = (int) $this->params->getRequired('schedule');
+        $displayTimezone = $this->params->get('display_timezone');
         $this->setTitle($this->translate('Add Rotation'));
 
-        $form = new RotationConfigForm($scheduleId, Database::get());
+        $scheduleTimezone = $this->getScheduleTimezone($scheduleId);
+
+        if ($displayTimezone !== $scheduleTimezone) {
+            $this->addContent(new TimezoneWarning($scheduleTimezone));
+        }
+
+        $form = new RotationConfigForm($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) {
@@ -139,10 +163,17 @@ public function addRotationAction(): void
     public function editRotationAction(): void
     {
         $id = (int) $this->params->getRequired('id');
+        $displayTimezone = $this->params->get('display_timezone');
         $scheduleId = (int) $this->params->getRequired('schedule');
         $this->setTitle($this->translate('Edit Rotation'));
 
-        $form = new RotationConfigForm($scheduleId, Database::get());
+        $scheduleTimezone = $this->getScheduleTimezone($scheduleId);
+
+        if ($displayTimezone !== $scheduleTimezone) {
+            $this->addContent(new TimezoneWarning($scheduleTimezone));
+        }
+
+        $form = new RotationConfigForm($scheduleId, Database::get(), $displayTimezone);
         $form->disableModeSelection();
         $form->setShowRemoveButton();
         $form->loadRotation($id);
@@ -203,4 +234,48 @@ public function suggestRecipientAction(): void
 
         $this->getDocument()->addHtml($suggestions);
     }
+
+    /**
+     * Get the timezone of a schedule
+     *
+     * @param int $scheduleId The ID of the schedule
+     *
+     * @return string The timezone of the schedule
+     */
+    protected function getScheduleTimezone(int $scheduleId): string
+    {
+        return Schedule::on(Database::get())
+            ->filter(Filter::equal('schedule.id', $scheduleId))
+            ->first()
+            ->timezone;
+    }
+
+    /**
+     * Create a timezone picker control
+     *
+     * @param string $defaultTimezone The default timezone to use if none is set in the request
+     *
+     * @return TimezonePicker The timezone picker control
+     */
+    protected function createTimezonePicker(string $defaultTimezone): TimezonePicker
+    {
+        $defaultTimezoneParam = TimezonePicker::DEFAULT_TIMEZONE_PARAM;
+        $timezoneParam = $this->params->shift($defaultTimezoneParam);
+
+        ScheduleDateTimeFactory::setDisplayTimezone($timezoneParam ?? $defaultTimezone);
+
+        return (new TimezonePicker())
+            ->populate([$defaultTimezoneParam => $timezoneParam ?? $defaultTimezone])
+            ->on(
+                TimezonePicker::ON_SUBMIT,
+                function (TimezonePicker $timezonePicker) use ($defaultTimezoneParam) {
+                    $requestUrl = Url::fromRequest();
+                    if ($requestUrl->getParam($defaultTimezoneParam) !== $timezonePicker->getValue($defaultTimezoneParam)) {
+                        $this->redirectNow($requestUrl->with([
+                            $defaultTimezoneParam => $timezonePicker->getValue($defaultTimezoneParam)
+                        ]));
+                    }
+                }
+            )->handleRequest($this->getServerRequest());
+    }
 }
diff --git a/application/controllers/SchedulesController.php b/application/controllers/SchedulesController.php
index 2a022da6c..a9c212486 100644
--- a/application/controllers/SchedulesController.php
+++ b/application/controllers/SchedulesController.php
@@ -4,16 +4,12 @@
 
 namespace Icinga\Module\Notifications\Controllers;
 
-use DateTime;
 use Icinga\Module\Notifications\Common\Database;
 use Icinga\Module\Notifications\Common\Links;
 use Icinga\Module\Notifications\Model\Schedule;
 use Icinga\Module\Notifications\View\ScheduleRenderer;
 use Icinga\Module\Notifications\Web\Control\SearchBar\ObjectSuggestions;
 use Icinga\Module\Notifications\Widget\ItemList\ObjectList;
-use Icinga\Module\Notifications\Widget\TimeGrid\DaysHeader;
-use ipl\Html\Attributes;
-use ipl\Html\HtmlElement;
 use ipl\Stdlib\Filter;
 use ipl\Web\Compat\CompatController;
 use ipl\Web\Compat\SearchControls;
@@ -78,12 +74,6 @@ public function indexAction(): void
             ))->openInModal()
         );
 
-        $this->addContent(new HtmlElement(
-            'div',
-            Attributes::create(['class' => 'schedules-header']),
-            new DaysHeader((new DateTime())->setTime(0, 0), 7)
-        ));
-
         $this->addContent(new ObjectList($schedules, new ScheduleRenderer()));
 
         if (! $searchBar->hasBeenSubmitted() && $searchBar->hasBeenSent()) {
diff --git a/application/forms/RotationConfigForm.php b/application/forms/RotationConfigForm.php
index b6cf9b8f7..fb34aa412 100644
--- a/application/forms/RotationConfigForm.php
+++ b/application/forms/RotationConfigForm.php
@@ -6,6 +6,7 @@
 
 use DateInterval;
 use DateTime;
+use DateTimeZone;
 use Generator;
 use Icinga\Exception\ConfigurationError;
 use Icinga\Exception\Http\HttpNotFoundException;
@@ -13,6 +14,7 @@
 use Icinga\Module\Notifications\Model\Contact;
 use Icinga\Module\Notifications\Model\Contactgroup;
 use Icinga\Module\Notifications\Model\Rotation;
+use Icinga\Module\Notifications\Model\Schedule;
 use Icinga\Module\Notifications\Model\TimeperiodEntry;
 use Icinga\Util\Json;
 use Icinga\Web\Session;
@@ -78,6 +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
      *
@@ -185,11 +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;
     }
 
     /**
@@ -800,9 +807,10 @@ protected function assemblePartialDayOptions(FieldsetElement $options): DateTime
         ]);
 
         $selectedFromTime = $from->getValue();
+        $nextDayTimeOptions = [];
         foreach ($timeOptions as $key => $value) {
-            unset($timeOptions[$key]); // unset to re-add it at the end of array
-            $timeOptions[$key] = sprintf('%s (%s)', $value, $this->translate('Next Day'));
+            unset($timeOptions[$key]);
+            $nextDayTimeOptions[$key] = $value;
 
             if ($selectedFromTime === $key) {
                 break;
@@ -811,7 +819,9 @@ protected function assemblePartialDayOptions(FieldsetElement $options): DateTime
 
         $to = $options->createElement('select', 'to', [
             'required' => true,
-            'options' => $timeOptions
+            'options' => empty($timeOptions)
+                ? ['Next Day' => $nextDayTimeOptions]
+                : ['Today' => $timeOptions, 'Next Day' => $nextDayTimeOptions]
         ]);
         $options->registerElement($to);
 
@@ -1145,7 +1155,8 @@ function ($value, $validator) use ($earliestHandoff, $firstHandoff, $latestHando
                             (new \IntlDateFormatter(
                                 \Locale::getDefault(),
                                 \IntlDateFormatter::MEDIUM,
-                                \IntlDateFormatter::SHORT
+                                \IntlDateFormatter::SHORT,
+                                $this->getScheduleTimezone()
                             ))->format($actualFirstHandoff)
                         );
                     }
@@ -1270,7 +1281,8 @@ private function parseDateAndTime(?string $date = null, ?string $time = null): D
             return (new DateTime())->setTime(0, 0);
         }
 
-        $datetime = DateTime::createFromFormat($format, $expression);
+        $datetime = DateTime::createFromFormat($format, $expression, new DateTimeZone($this->getScheduleTimezone()));
+
         if ($datetime === false) {
             $datetime = (new DateTime())->setTime(0, 0);
         } elseif ($time === null) {
@@ -1293,12 +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)
+                );
             }
         }
 
@@ -1665,4 +1690,17 @@ public function hasChanges(): bool
 
         return ! empty(array_udiff_assoc($values, $dbValuesToCompare, $checker));
     }
+
+    /**
+     * Get the timezone of the schedule
+     *
+     * @return string The timezone identifier
+     */
+    protected function getScheduleTimezone(): string
+    {
+        return Schedule::on(Database::get())
+            ->filter(Filter::equal('id', $this->scheduleId))
+            ->first()
+            ->timezone;
+    }
 }
diff --git a/application/forms/ScheduleForm.php b/application/forms/ScheduleForm.php
index e3782e48c..d75ae8f2a 100644
--- a/application/forms/ScheduleForm.php
+++ b/application/forms/ScheduleForm.php
@@ -5,6 +5,7 @@
 namespace Icinga\Module\Notifications\Forms;
 
 use DateTime;
+use DateTimeZone;
 use Icinga\Exception\Http\HttpNotFoundException;
 use Icinga\Module\Notifications\Model\Rotation;
 use Icinga\Module\Notifications\Model\RuleEscalationRecipient;
@@ -29,6 +30,9 @@ class ScheduleForm extends CompatForm
     /** @var bool */
     protected $showRemoveButton = false;
 
+    /** @var bool */
+    protected $showTimezoneDropdown = false;
+
     /** @var Connection */
     private $db;
 
@@ -59,6 +63,20 @@ public function setShowRemoveButton(bool $state = true): self
         return $this;
     }
 
+    /**
+     * Set whether to show the timezone dropdown or not
+     *
+     * @param bool $state If true, the timezone dropdown will be shown (defaults to true)
+     *
+     * @return $this
+     */
+    public function setShowTimezoneDropdown(bool $state = true): self
+    {
+        $this->showTimezoneDropdown = $state;
+
+        return $this;
+    }
+
     public function hasBeenRemoved(): bool
     {
         $btn = $this->getPressedSubmitElement();
@@ -78,7 +96,8 @@ public function addSchedule(): int
         return $this->db->transaction(function (Connection $db) {
             $db->insert('schedule', [
                 'name' => $this->getValue('name'),
-                'changed_at' => (int) (new DateTime())->format("Uv")
+                'changed_at' => (int) (new DateTime())->format("Uv"),
+                'timezone' => $this->getValue('timezone')
             ]);
 
             return $db->lastInsertId();
@@ -175,6 +194,16 @@ protected function assemble()
             'placeholder'   => $this->translate('e.g. working hours, on call, etc ...')
         ]);
 
+        if ($this->showTimezoneDropdown) {
+            $this->addElement('select', 'timezone', [
+                'required'     => true,
+                'label'        => $this->translate('Schedule Timezone'),
+                'description'  => $this->translate('Select the time zone in which this schedule operates.'),
+                'multiOptions' => array_combine(DateTimeZone::listIdentifiers(), DateTimeZone::listIdentifiers()),
+                'value'        => date_default_timezone_get(),
+            ]);
+        }
+
         $this->addElement('submit', 'submit', [
             'label' => $this->getSubmitLabel()
         ]);
diff --git a/library/Notifications/Common/Links.php b/library/Notifications/Common/Links.php
index 3773f8589..de23859cc 100644
--- a/library/Notifications/Common/Links.php
+++ b/library/Notifications/Common/Links.php
@@ -4,6 +4,7 @@
 
 namespace Icinga\Module\Notifications\Common;
 
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
 use ipl\Web\Url;
 
 /**
@@ -118,12 +119,19 @@ public static function contactGroupEdit(int $id): Url
 
     public static function rotationAdd(int $scheduleId): Url
     {
-        return Url::fromPath('notifications/schedule/add-rotation', ['schedule' => $scheduleId]);
+        return Url::fromPath('notifications/schedule/add-rotation', [
+            'schedule' => $scheduleId,
+            'display_timezone' => ScheduleDateTimeFactory::getDisplayTimezone()->getName()
+        ]);
     }
 
     public static function rotationSettings(int $id, int $scheduleId): Url
     {
-        return Url::fromPath('notifications/schedule/edit-rotation', ['id' => $id, 'schedule' => $scheduleId]);
+        return Url::fromPath('notifications/schedule/edit-rotation', [
+            'id' => $id,
+            'schedule' => $scheduleId,
+            'display_timezone' => ScheduleDateTimeFactory::getDisplayTimezone()->getName()
+        ]);
     }
 
     public static function moveRotation(): Url
diff --git a/library/Notifications/Model/Schedule.php b/library/Notifications/Model/Schedule.php
index c3f82339c..af1aef4e3 100644
--- a/library/Notifications/Model/Schedule.php
+++ b/library/Notifications/Model/Schedule.php
@@ -15,6 +15,7 @@
 /**
  * @property int $id
  * @property string $name
+ * @property string $timezone
  * @property DateTime $changed_at
  * @property bool $deleted
  *
@@ -39,6 +40,7 @@ public function getColumns(): array
         return [
             'name',
             'changed_at',
+            'timezone',
             'deleted'
         ];
     }
@@ -47,7 +49,8 @@ public function getColumnDefinitions(): array
     {
         return [
             'name'          => t('Name'),
-            'changed_at'    => t('Changed At')
+            'changed_at'    => t('Changed At'),
+            'timezone'      => t('Timezone')
         ];
     }
 
diff --git a/library/Notifications/Util/ScheduleDateTimeFactory.php b/library/Notifications/Util/ScheduleDateTimeFactory.php
new file mode 100644
index 000000000..9df1dfe1c
--- /dev/null
+++ b/library/Notifications/Util/ScheduleDateTimeFactory.php
@@ -0,0 +1,54 @@
+<?php
+
+/* Icinga Notifications Web | (c) 2025 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Notifications\Util;
+
+use DateTime;
+use DateTimeZone;
+
+/**
+ * Factory to create DateTime objects for schedules in a specific timezone
+ */
+class ScheduleDateTimeFactory
+{
+    protected static ?DateTimeZone $timezone;
+
+    /**
+     * Set the display timezone for the schedule
+     *
+     * @param DateTimeZone|string $timezone The timezone identifier (e.g. 'Europe/Berlin')
+     *
+     * @return void
+     */
+    public static function setDisplayTimezone(DateTimeZone|string $timezone): void
+    {
+        if ($timezone instanceof DateTimeZone) {
+            static::$timezone = $timezone;
+        } else {
+            static::$timezone = new DateTimeZone($timezone);
+        }
+    }
+
+    /**
+     * Get the display timezone for the schedule
+     *
+     * @return DateTimeZone
+     */
+    public static function getDisplayTimezone(): DateTimeZone
+    {
+        return static::$timezone ?? new DateTimeZone(date_default_timezone_get());
+    }
+
+    /**
+     * Create a DateTime object in the schedule's timezone
+     *
+     * @param string $datetime The datetime string (default is 'now')
+     *
+     * @return DateTime
+     */
+    public static function createDateTime(string $datetime = 'now'): DateTime
+    {
+        return new DateTime($datetime, static::getDisplayTimezone());
+    }
+}
diff --git a/library/Notifications/View/ScheduleRenderer.php b/library/Notifications/View/ScheduleRenderer.php
index 5459392a6..b53e53c1d 100644
--- a/library/Notifications/View/ScheduleRenderer.php
+++ b/library/Notifications/View/ScheduleRenderer.php
@@ -4,16 +4,11 @@
 
 namespace Icinga\Module\Notifications\View;
 
-use DateTime;
 use Icinga\Module\Notifications\Common\Links;
 use Icinga\Module\Notifications\Model\Schedule;
-use Icinga\Module\Notifications\Widget\Timeline;
-use Icinga\Module\Notifications\Widget\Timeline\Rotation;
-use Icinga\Util\Csp;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlDocument;
 use ipl\Web\Common\ItemRenderer;
-use ipl\Web\Style;
 use ipl\Web\Widget\Link;
 
 /** @implements ItemRenderer<Schedule> */
@@ -41,23 +36,6 @@ public function assembleTitle($item, HtmlDocument $title, string $layout): void
 
     public function assembleCaption($item, HtmlDocument $caption, string $layout): void
     {
-        // Number of days is set to 7, since default mode for schedule is week
-        // and the start day should be the current day
-        $timeline = (new Timeline($item->id, (new DateTime())->setTime(0, 0), 7))
-            ->minimalLayout()
-            ->setStyle(
-                (new Style())
-                    ->setNonce(Csp::getStyleNonce())
-                    ->setModule('notifications')
-            );
-
-        $rotations = $item->rotation->with('timeperiod')->orderBy('first_handoff', SORT_DESC);
-
-        foreach ($rotations as $rotation) {
-            $timeline->addRotation(new Rotation($rotation));
-        }
-
-        $caption->addHtml($timeline);
     }
 
     public function assembleExtendedInfo($item, HtmlDocument $info, string $layout): void
diff --git a/library/Notifications/Web/Control/TimezonePicker.php b/library/Notifications/Web/Control/TimezonePicker.php
new file mode 100644
index 000000000..13c4f9ca8
--- /dev/null
+++ b/library/Notifications/Web/Control/TimezonePicker.php
@@ -0,0 +1,32 @@
+<?php
+
+/* Icinga Notifications Web | (c) 2025 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Notifications\Web\Control;
+
+use DateTimeZone;
+use ipl\Html\Form;
+use ipl\Html\HtmlElement;
+
+/**
+ * A simple dropdown menu to pick a timezone.
+ */
+class TimezonePicker extends Form
+{
+    /** @var string Default timezone param  */
+    public const DEFAULT_TIMEZONE_PARAM = 'display_timezone';
+
+    protected $defaultAttributes = ['class' => 'timezone-picker'];
+
+    public function assemble(): void
+    {
+        $this->addElement('select', static::DEFAULT_TIMEZONE_PARAM,
+            [
+                'class' => 'autosubmit',
+                'label' => 'Display Timezone',
+                'options' => array_combine(DateTimeZone::listIdentifiers(), DateTimeZone::listIdentifiers())]
+        );
+        $select = $this->getElement(static::DEFAULT_TIMEZONE_PARAM);
+        $select->prependWrapper(HtmlElement::create('div', ['class' => 'icinga-controls']));
+    }
+}
diff --git a/library/Notifications/Widget/Detail/ScheduleDetail/Controls.php b/library/Notifications/Widget/Detail/ScheduleDetail/Controls.php
index 398566da3..f1ed32231 100644
--- a/library/Notifications/Widget/Detail/ScheduleDetail/Controls.php
+++ b/library/Notifications/Widget/Detail/ScheduleDetail/Controls.php
@@ -5,6 +5,7 @@
 namespace Icinga\Module\Notifications\Widget\Detail\ScheduleDetail;
 
 use DateTime;
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
 use Icinga\Web\Session;
 use ipl\Html\Attributes;
 use ipl\Html\Form;
@@ -62,7 +63,7 @@ public function getNumberOfDays(): int
      */
     public function getStartDate(): DateTime
     {
-        return (new DateTime())->setTime(0, 0);
+        return ScheduleDateTimeFactory::createDateTime()->setTime(0, 0);
     }
 
     protected function onSuccess()
diff --git a/library/Notifications/Widget/TimeGrid/DaysHeader.php b/library/Notifications/Widget/TimeGrid/DaysHeader.php
index 0633fbfa4..9ec3756e7 100644
--- a/library/Notifications/Widget/TimeGrid/DaysHeader.php
+++ b/library/Notifications/Widget/TimeGrid/DaysHeader.php
@@ -6,6 +6,7 @@
 
 use DateInterval;
 use DateTime;
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
 use IntlDateFormatter;
 use ipl\Html\Attributes;
 use ipl\Html\BaseHtmlElement;
@@ -53,7 +54,7 @@ public function assemble(): void
         ];
 
         $interval = new DateInterval('P1D');
-        $today = (new DateTime())->setTime(0, 0);
+        $today = ScheduleDateTimeFactory::createDateTime()->setTime(0, 0);
         $time = clone $this->startDay;
         $dateFormatter = new IntlDateFormatter(
             Locale::getDefault(),
diff --git a/library/Notifications/Widget/Timeline.php b/library/Notifications/Widget/Timeline.php
index 368fa42e9..cd6bfda3b 100644
--- a/library/Notifications/Widget/Timeline.php
+++ b/library/Notifications/Widget/Timeline.php
@@ -8,6 +8,7 @@
 use DateTime;
 use Icinga\Module\Notifications\Common\Links;
 use Icinga\Module\Notifications\Forms\MoveRotationForm;
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
 use Icinga\Module\Notifications\Widget\TimeGrid\DynamicGrid;
 use Icinga\Module\Notifications\Widget\TimeGrid\EntryProvider;
 use Icinga\Module\Notifications\Widget\TimeGrid\GridStep;
@@ -356,10 +357,11 @@ protected function assemble()
             $dateFormatter = new IntlDateFormatter(
                 Locale::getDefault(),
                 IntlDateFormatter::NONE,
-                IntlDateFormatter::SHORT
+                IntlDateFormatter::SHORT,
+                ScheduleDateTimeFactory::getDisplayTimezone()
             );
 
-            $now = new DateTime();
+            $now = ScheduleDateTimeFactory::createDateTime();
             $currentTime = new HtmlElement(
                 'div',
                 new Attributes(['class' => 'time-hand']),
diff --git a/library/Notifications/Widget/Timeline/Entry.php b/library/Notifications/Widget/Timeline/Entry.php
index 859bb605b..00bcb163f 100644
--- a/library/Notifications/Widget/Timeline/Entry.php
+++ b/library/Notifications/Widget/Timeline/Entry.php
@@ -4,9 +4,10 @@
 
 namespace Icinga\Module\Notifications\Widget\Timeline;
 
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
+use Icinga\Module\Notifications\Widget\TimeGrid;
 use ipl\Html\Attributes;
 use ipl\Html\BaseHtmlElement;
-use Icinga\Module\Notifications\Widget\TimeGrid;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
 use ipl\Web\Widget\Icon;
@@ -57,7 +58,12 @@ protected function assembleContainer(BaseHtmlElement $container): void
             $dateType = \IntlDateFormatter::SHORT;
         }
 
-        $formatter = new \IntlDateFormatter(\Locale::getDefault(), $dateType, $timeType);
+        $formatter = new \IntlDateFormatter(
+            \Locale::getDefault(),
+            $dateType,
+            $timeType,
+            ScheduleDateTimeFactory::getDisplayTimezone()
+        );
 
         $container->addAttributes([
             'title' => sprintf(
diff --git a/library/Notifications/Widget/Timeline/Rotation.php b/library/Notifications/Widget/Timeline/Rotation.php
index 536dbc063..bba961ee7 100644
--- a/library/Notifications/Widget/Timeline/Rotation.php
+++ b/library/Notifications/Widget/Timeline/Rotation.php
@@ -6,9 +6,11 @@
 
 use DateInterval;
 use DateTime;
+use DateTimeZone;
 use Generator;
 use Icinga\Module\Notifications\Common\Links;
 use Icinga\Module\Notifications\Forms\RotationConfigForm;
+use Icinga\Module\Notifications\Util\ScheduleDateTimeFactory;
 use ipl\Scheduler\RRule;
 use ipl\Stdlib\Filter;
 use Recurr\Frequency;
@@ -115,10 +117,12 @@ public function fetchTimeperiodEntries(DateTime $after, DateTime $until): Genera
                     }
                 } // TODO: Yearly? (Those unoptimized single occurrences)
 
-                $before = (clone $after)->setTime(
-                    (int) $timeperiodEntry->start_time->format('H'),
-                    (int) $timeperiodEntry->start_time->format('i')
-                );
+                $before = (clone $after)
+                    ->setTimezone(new DateTimeZone($this->model->schedule->execute()->current()->timezone))
+                    ->setTime(
+                        (int) $timeperiodEntry->start_time->format('H'),
+                        (int) $timeperiodEntry->start_time->format('i')
+                    );
 
                 if ($timeperiodEntry->start_time < $before) {
                     $daysSinceLatestHandoff = $timeperiodEntry->start_time->diff($before)->days % $interval;
@@ -133,6 +137,7 @@ public function fetchTimeperiodEntries(DateTime $after, DateTime $until): Genera
                 $length = $timeperiodEntry->start_time->diff($timeperiodEntry->end_time);
                 $limit = (((int) ceil($after->diff($until)->days / $interval)) + 1) * $limitMultiplier;
                 foreach ($rrule->getNextRecurrences($firstHandoff, $limit) as $recurrence) {
+                    $recurrence = ScheduleDateTimeFactory::createDateTime('@' . $recurrence->getTimestamp());
                     $recurrenceEnd = (clone $recurrence)->add($length);
                     if ($recurrence < $actualHandoff && $recurrenceEnd > $actualHandoff) {
                         $recurrence = $actualHandoff;
diff --git a/library/Notifications/Widget/TimezoneWarning.php b/library/Notifications/Widget/TimezoneWarning.php
new file mode 100644
index 000000000..604ec5911
--- /dev/null
+++ b/library/Notifications/Widget/TimezoneWarning.php
@@ -0,0 +1,38 @@
+<?php
+
+/* Icinga Notifications Web | (c) 2025 Icinga GmbH | GPLv2 */
+
+namespace Icinga\Module\Notifications\Widget;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\HtmlElement;
+use ipl\Html\Text;
+use ipl\I18n\Translation;
+use ipl\Web\Widget\Icon;
+
+/**
+ * A warning box that indicates the schedule's timezone. It should be used to warn
+ * the user that the display timezone differs from the schedule's timezone.
+ */
+class TimezoneWarning extends BaseHtmlElement
+{
+    use Translation;
+
+    public function __construct(
+        protected string $timezone,
+        protected $tag = 'div',
+        protected $defaultAttributes = ['class' => 'timezone-warning']
+    ) {
+    }
+
+    public function assemble(): void
+    {
+        $this->addHtml(new Icon('warning'));
+        $this->addHtml(new HtmlElement(
+            'p',
+            null,
+            new Text($this->translate('The schedule\'s timezone is ')),
+            new HtmlElement('strong', null, new Text($this->timezone))
+        ));
+    }
+}
diff --git a/public/css/form.less b/public/css/form.less
index de5e13163..86455e519 100644
--- a/public/css/form.less
+++ b/public/css/form.less
@@ -88,6 +88,15 @@
   }
 }
 
+.timezone-picker {
+  display: inline;
+  margin-left: 1em;
+
+  .icinga-controls {
+    display: inline;
+  }
+}
+
 /* Style */
 
 .icinga-controls {
diff --git a/public/css/schedule.less b/public/css/schedule.less
index 01a5a1797..c497257cb 100644
--- a/public/css/schedule.less
+++ b/public/css/schedule.less
@@ -67,6 +67,25 @@
   }
 }
 
+.timezone-warning {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  column-gap: 1em;
+
+  width: fit-content;
+  margin: 0 auto 1em auto;
+  padding: .5em 1em;
+
+  i.icon:before {
+    margin-right: 0;
+  }
+
+  p {
+    margin: 0;
+  }
+}
+
 /* Design */
 
 .schedule-detail .entry.highlighted {
@@ -85,3 +104,13 @@
   padding: .5em;
   color: @text-color-light;
 }
+
+.timezone-warning {
+  border: 1px solid @color-warning;
+  border-radius: .25em;
+
+  i.icon {
+    color: @color-warning;
+    font-size: 1.5em;
+  }
+}