diff --git a/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
index 96ed4a8c..19d30af3 100644
--- a/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
+++ b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
@@ -124,34 +124,59 @@ class ClockifyTimeEntriesImporter extends DefaultImporter
                 $timeEntry->is_imported = true;
 
                 // Start
+                $start = null;
                 try {
-                    if (preg_match('/^[0-9]{1,2}:[0-9]{1,2} (AM|PM)$/', $record['Start Time']) === 1) {
-                        $start = Carbon::createFromFormat('m/d/Y h:i A', $record['Start Date'].' '.$record['Start Time'], $timezone);
-                    } else {
-                        $start = Carbon::createFromFormat('m/d/Y H:i:s A', $record['Start Date'].' '.$record['Start Time'], $timezone);
+                    $startDateStr = $record['Start Date'];
+                    $startTimeStr = $record['Start Time'];
+                    $startStr = $startDateStr.' '.$startTimeStr;
+                    $matches = [];
+                    $checkResult = preg_match('/^([0-9]{1,2})\/([0-9]{1,2})\/([0-9]{4}) ([0-9]{1,2}):([0-9]{1,2})(:[0-9]{1,2})? (AM|PM)$/', $startStr, $matches);
+
+                    if ($checkResult === 1) {
+                        if ((int) $matches[1] > 12) {
+                            throw new ImportException('Start date ("'.$startDateStr.'") is invalid, please select the correct date format before exporting from Clockify');
+                        }
+                        if ($matches[6] === '') {
+                            $start = Carbon::createFromFormat('m/d/Y h:i A', $startStr, $timezone);
+                        } else {
+                            $start = Carbon::createFromFormat('m/d/Y H:i:s A', $startStr, $timezone);
+                        }
                     }
                 } catch (InvalidFormatException) {
-                    throw new ImportException('Start date ("'.$record['Start Date'].'") or time ("'.$record['Start Time'].'") are invalid');
+                    throw new ImportException('Start date ("'.$startDateStr.'") or time ("'.$startTimeStr.'") are invalid');
                 }
                 if ($start === null) {
-                    throw new ImportException('Start date ("'.$record['Start Date'].'") or time ("'.$record['Start Time'].'") are invalid');
+                    throw new ImportException('Start date ("'.$startDateStr.'") or time ("'.$startTimeStr.'") are invalid');
                 }
                 $timeEntry->start = $start->utc();
 
                 // End
+                $end = null;
                 try {
-                    if (preg_match('/^[0-9]{1,2}:[0-9]{1,2} (AM|PM)$/', $record['End Time']) === 1) {
-                        $end = Carbon::createFromFormat('m/d/Y h:i A', $record['End Date'].' '.$record['End Time'], $timezone);
-                    } else {
-                        $end = Carbon::createFromFormat('m/d/Y H:i:s A', $record['End Date'].' '.$record['End Time'], $timezone);
+                    $endDateStr = $record['End Date'];
+                    $endTimeStr = $record['End Time'];
+                    $endStr = $endDateStr.' '.$endTimeStr;
+                    $matches = [];
+                    $checkResult = preg_match('/^([0-9]{1,2})\/([0-9]{1,2})\/([0-9]{4}) ([0-9]{1,2}):([0-9]{1,2})(:[0-9]{1,2})? (AM|PM)$/', $endStr, $matches);
+
+                    if ($checkResult === 1) {
+                        if ((int) $matches[1] > 12) {
+                            throw new ImportException('Start date ("'.$endDateStr.'") is invalid, please select the correct date format before exporting from Clockify');
+                        }
+                        if ($matches[6] === '') {
+                            $end = Carbon::createFromFormat('m/d/Y h:i A', $endStr, $timezone);
+                        } else {
+                            $end = Carbon::createFromFormat('m/d/Y H:i:s A', $endStr, $timezone);
+                        }
                     }
                 } catch (InvalidFormatException) {
-                    throw new ImportException('End date ("'.$record['End Date'].'") or time ("'.$record['End Time'].'") are invalid');
+                    throw new ImportException('End date ("'.$endDateStr.'") or time ("'.$endTimeStr.'") are invalid');
                 }
                 if ($end === null) {
-                    throw new ImportException('End date ("'.$record['End Date'].'") or time ("'.$record['End Time'].'") are invalid');
+                    throw new ImportException('End date ("'.$endDateStr.'") or time ("'.$endTimeStr.'") are invalid');
                 }
                 $timeEntry->end = $end->utc();
+
                 $timeEntry->billable_rate = $this->billableRateService->getBillableRateForTimeEntryWithGivenRelations(
                     $timeEntry,
                     $projectMember,
diff --git a/resources/testfiles/clockify_time_entries_import_test_3.csv b/resources/testfiles/clockify_time_entries_import_test_3.csv
new file mode 100644
index 00000000..92b64e3d
--- /dev/null
+++ b/resources/testfiles/clockify_time_entries_import_test_3.csv
@@ -0,0 +1,2 @@
+"Project","Client","Description","Task","User","Group","Email","Tags","Type","Billable","Invoiced","Invoice ID","Start Date","Start Time","End Date","End Time","Duration (h)","Duration (decimal)","Billable Rate (EUR)","Billable Amount (EUR)","Date of creation"
+"Real World Project","Real World Client","\\ 🔥 Special characters  ''''''`!@#$%^&*()_+\-=\[\]{};':''\\|,.''<>\/?~ \\\","A giant task","Peter Tester","Group1, Group2","peter.test@email.test","","Regular","Yes","Yes","Invoice100","13/15/2024","11:00:00 AM","10/15/2024","11:30:00 AM","00:30:00","0.50","1000.00","500.00","10/15/2024"
diff --git a/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php b/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
index 91adadd3..eb6ca5e0 100644
--- a/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
+++ b/tests/Unit/Service/Import/Importers/ClockifyTimeEntriesImporterTest.php
@@ -94,4 +94,25 @@ class ClockifyTimeEntriesImporterTest extends ImporterTestAbstract
         $this->assertSame(0, $report->projectsCreated);
         $this->assertSame(0, $report->clientsCreated);
     }
+
+    public function test_import_fails_if_month_in_date_is_bigger_than_12(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $timezone = 'Europe/Vienna';
+        $importer = new ClockifyTimeEntriesImporter;
+        $importer->init($organization);
+        $data = Storage::disk('testfiles')->get('clockify_time_entries_import_test_3.csv');
+
+        // Act
+        try {
+            $importer->importData($data, $timezone);
+        } catch (ImportException $e) {
+            // Assert
+            $this->assertSame('Start date ("13/15/2024") is invalid, please select the correct date format before exporting from Clockify', $e->getMessage());
+
+            return;
+        }
+        $this->fail();
+    }
 }