diff --git a/src/Tags/Events.php b/src/Tags/Events.php
index 537b64f..99e5e20 100755
--- a/src/Tags/Events.php
+++ b/src/Tags/Events.php
@@ -7,6 +7,7 @@
 use Carbon\CarbonInterface;
 use Carbon\CarbonPeriod;
 use Carbon\CarbonPeriodImmutable;
+use Closure;
 use Illuminate\Pagination\Paginator;
 use Illuminate\Support\Collection;
 use Statamic\Contracts\Query\Builder;
@@ -41,14 +42,14 @@ public function calendar(): Collection
         $month = $this->params->get('month', now()->englishMonth);
         $year = $this->params->get('year', now()->year);
 
-        $from = parse_date($month . ' ' . $year)->startOfMonth()->startOfWeek();
-        $to = parse_date($month . ' ' . $year)->endOfMonth()->endOfWeek();
+        $from = parse_date($month.' '.$year)->startOfMonth()->startOfWeek();
+        $to = parse_date($month.' '.$year)->endOfMonth()->endOfWeek();
 
         $occurrences = $this
             ->generator()
             ->between(from: $from, to: $to)
             ->groupBy($this->spanningDays())
-            ->map(fn(EntryCollection $occurrences, string $date) => $this->day(date: $date, occurrences: $occurrences));
+            ->map(fn (EntryCollection $occurrences, string $date) => $this->day(date: $date, occurrences: $occurrences));
 
         $days = $this->output($this->makeEmptyDates(from: $from, to: $to)->merge($occurrences)->values());
 
@@ -135,12 +136,27 @@ public function upcoming(): EntryCollection|array
         return $this->output($occurrences->take($limit));
     }
 
+    private function addSpanningStartEnd(string $date, EntryCollection $occurrences): EntryCollection
+    {
+        return $occurrences->map(function (Entry $occurrence) use ($date) {
+            if (! $occurrence->spanning) {
+                return $occurrence;
+            }
+
+            $carbonDate = Carbon::parse($date)->shiftTimezone($occurrence->start->timezone);
+            $occurrence
+                ->setSupplement('spanning_start', $occurrence->start->isSameDay($carbonDate))
+                ->setSupplement('spanning_end', $occurrence->end->isSameDay($carbonDate));
+
+            return clone $occurrence;
+        });
+    }
+
     private function day(string $date, EntryCollection $occurrences): array
     {
         return [
             'date' => $date,
-            'dates' => $occurrences,
-            'occurrences' => $occurrences,
+            'occurrences' => $this->addSpanningStartEnd($date, $occurrences),
         ];
     }
 
@@ -244,7 +260,7 @@ private function parseTermIds(string $key, array|Builder|string $terms): array
             ->all();
     }
 
-    private function spanningDays(): \Closure
+    private function spanningDays(): Closure
     {
         return function (Entry $occurrence) {
             $spanningDays = CarbonPeriodImmutable::between(
@@ -252,7 +268,7 @@ private function spanningDays(): \Closure
                 $occurrence->end->endOfDay()
             )->toArray();
 
-            return collect($spanningDays)->map(fn(CarbonImmutable $date) => $date->toDateString())->all();
+            return collect($spanningDays)->map(fn (CarbonImmutable $date) => $date->toDateString())->all();
         };
     }
 }
diff --git a/tests/Tags/EventsTest.php b/tests/Tags/EventsTest.php
index 51a5b80..0dc46dd 100755
--- a/tests/Tags/EventsTest.php
+++ b/tests/Tags/EventsTest.php
@@ -96,7 +96,7 @@
     $occurrences = $this->tag->calendar();
 
     expect($occurrences)->toHaveCount(42);
-    expect(Arr::get($occurrences, '5.dates'))->toHaveCount(2);
+    expect(Arr::get($occurrences, '5.occurrences'))->toHaveCount(2);
     expect(Arr::get($occurrences, '6.no_results'))->toBeTrue();
 });
 
@@ -456,3 +456,34 @@
     expect($occurrences)->toHaveCount(1)
         ->first()->spanning->toBeTrue();
 });
+
+it('sets "spanning-start" and "spanning-end"', function () {
+    Carbon::setTestNow(Carbon::parse('April 16 10:00am'));
+
+    Entry::make()
+        ->collection('events')
+        ->slug('single-event')
+        ->id('single-event')
+        ->data([
+            'title' => 'Event',
+            'start_date' => Carbon::now()->toDateString(),
+            'start_time' => '11:00',
+            'end_time' => '23:00',
+        ])->save();
+
+    $this->tag
+        ->setContext([])
+        ->setParameters(['timezone' => 'Europe/Kyiv']);
+
+    $days = $this->tag->calendar();
+    $firstSpanningOccurrence = $days[17]['occurrences'][0];
+    $secondSpanningOccurrence = $days[18]['occurrences'][0];
+
+    expect($firstSpanningOccurrence)
+        ->spanning_start->toBeTrue()
+        ->spanning_end->toBeFalse();
+
+     expect($secondSpanningOccurrence)
+         ->spanning_start->toBeFalse()
+         ->spanning_end->toBeTrue();
+});