diff --git a/src/app/Livewire/Calendar/Forms/EventForm.php b/src/app/Livewire/Calendar/Forms/EventForm.php
index 0012580..d21e042 100644
--- a/src/app/Livewire/Calendar/Forms/EventForm.php
+++ b/src/app/Livewire/Calendar/Forms/EventForm.php
@@ -167,10 +167,10 @@ class EventForm extends Component
     {
         if (empty($this->customReminderTime)) return;
 
-        $this->reminders[] = [
-            'type' => $this->customReminderType ?: 'time_of_day',
-            'time' => $this->customReminderTime,
-        ];
+        $type = $this->customReminderType ?: 'time_of_day';
+        $time = $this->localTimeToUtc($this->customReminderTime);
+
+        $this->reminders[] = ['type' => $type, 'time' => $time];
 
         $this->customReminderTime = '';
         $this->customReminderType = 'time_of_day';
@@ -178,6 +178,10 @@ class EventForm extends Component
 
     public function addReminder(string $type, ?int $minutes = null, ?string $time = null): void
     {
+        if ($time !== null && in_array($type, ['time_of_day', 'day_before'])) {
+            $time = $this->localTimeToUtc($time);
+        }
+
         $this->reminders[] = array_filter([
             'type'    => $type,
             'minutes' => $minutes,
@@ -185,6 +189,12 @@ class EventForm extends Component
         ], fn($v) => $v !== null);
     }
 
+    private function localTimeToUtc(string $localTime): string
+    {
+        $tz = auth()->user()->timezone ?? 'UTC';
+        return \Carbon\Carbon::createFromFormat('H:i', $localTime, $tz)->utc()->format('H:i');
+    }
+
     public function removeReminder(int $i): void
     {
         array_splice($this->reminders, $i, 1);
diff --git a/src/resources/views/livewire/calendar/forms/event-form.blade.php b/src/resources/views/livewire/calendar/forms/event-form.blade.php
index d56708e..5063ff4 100644
--- a/src/resources/views/livewire/calendar/forms/event-form.blade.php
+++ b/src/resources/views/livewire/calendar/forms/event-form.blade.php
@@ -215,9 +215,9 @@
                         @else {{ $r['minutes'] ?? 30 }}{{ t('events.reminder_min_before') }}
                         @endif
                     @elseif(($r['type'] ?? '') === 'time_of_day')
-                        {{ t('events.reminder_on_day_prefix') }}{{ $r['time'] ?? '' }}{{ t('events.reminder_clock_suffix') }}
+                        {{ t('events.reminder_on_day_prefix') }}{{ isset($r['time']) ? \Carbon\Carbon::createFromFormat('H:i', $r['time'], 'UTC')->setTimezone(auth()->user()->timezone ?? 'UTC')->format('H:i') : '' }}{{ t('events.reminder_clock_suffix') }}
                     @else
-                        {{ t('events.reminder_prev_day_prefix') }}{{ $r['time'] ?? '' }}{{ t('events.reminder_clock_suffix') }}
+                        {{ t('events.reminder_prev_day_prefix') }}{{ isset($r['time']) ? \Carbon\Carbon::createFromFormat('H:i', $r['time'], 'UTC')->setTimezone(auth()->user()->timezone ?? 'UTC')->format('H:i') : '' }}{{ t('events.reminder_clock_suffix') }}
                     @endif
                 </span>
                 <button wire:click="removeReminder({{ $i }})" type="button"