diff --git a/src/Illuminate/Console/Scheduling/Event.php b/src/Illuminate/Console/Scheduling/Event.php
index 4ce5a7735d6c..2ae1f76c8b99 100644
--- a/src/Illuminate/Console/Scheduling/Event.php
+++ b/src/Illuminate/Console/Scheduling/Event.php
@@ -324,7 +324,7 @@ protected function expressionPasses()
         $date = Date::now();
 
         if ($this->timezone) {
-            $date->setTimezone($this->timezone);
+            $date = $date->setTimezone($this->timezone);
         }
 
         return (new CronExpression($this->expression))->isDue($date->toDateTimeString());
diff --git a/src/Illuminate/Console/Scheduling/ManagesFrequencies.php b/src/Illuminate/Console/Scheduling/ManagesFrequencies.php
index d45bc0f8275b..45b8896338ef 100644
--- a/src/Illuminate/Console/Scheduling/ManagesFrequencies.php
+++ b/src/Illuminate/Console/Scheduling/ManagesFrequencies.php
@@ -60,9 +60,9 @@ private function inTimeInterval($startTime, $endTime)
 
         if ($endTime->lessThan($startTime)) {
             if ($startTime->greaterThan($now)) {
-                $startTime->subDay(1);
+                $startTime = $startTime->subDay(1);
             } else {
-                $endTime->addDay(1);
+                $endTime = $endTime->addDay(1);
             }
         }
 
diff --git a/src/Illuminate/Foundation/Testing/TestCase.php b/src/Illuminate/Foundation/Testing/TestCase.php
index ee19a864b591..c085a3ce1418 100644
--- a/src/Illuminate/Foundation/Testing/TestCase.php
+++ b/src/Illuminate/Foundation/Testing/TestCase.php
@@ -2,11 +2,11 @@
 
 namespace Illuminate\Foundation\Testing;
 
-use Carbon\Carbon;
 use Carbon\CarbonImmutable;
 use Illuminate\Console\Application as Artisan;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Queue\Queue;
+use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\Facade;
 use Illuminate\Support\Facades\ParallelTesting;
 use Illuminate\Support\Str;
diff --git a/src/Illuminate/Queue/Console/PruneBatchesCommand.php b/src/Illuminate/Queue/Console/PruneBatchesCommand.php
index 808c82c5dcbf..deb4eb96f685 100644
--- a/src/Illuminate/Queue/Console/PruneBatchesCommand.php
+++ b/src/Illuminate/Queue/Console/PruneBatchesCommand.php
@@ -2,11 +2,11 @@
 
 namespace Illuminate\Queue\Console;
 
-use Carbon\Carbon;
 use Illuminate\Bus\BatchRepository;
 use Illuminate\Bus\DatabaseBatchRepository;
 use Illuminate\Bus\PrunableBatchRepository;
 use Illuminate\Console\Command;
+use Illuminate\Support\Carbon;
 
 class PruneBatchesCommand extends Command
 {
diff --git a/src/Illuminate/Queue/Console/PruneFailedJobsCommand.php b/src/Illuminate/Queue/Console/PruneFailedJobsCommand.php
index f82d9be3b955..64badcad2d28 100644
--- a/src/Illuminate/Queue/Console/PruneFailedJobsCommand.php
+++ b/src/Illuminate/Queue/Console/PruneFailedJobsCommand.php
@@ -2,9 +2,9 @@
 
 namespace Illuminate\Queue\Console;
 
-use Carbon\Carbon;
 use Illuminate\Console\Command;
 use Illuminate\Queue\Failed\PrunableFailedJobProvider;
+use Illuminate\Support\Carbon;
 
 class PruneFailedJobsCommand extends Command
 {
diff --git a/tests/Database/DatabaseEloquentIntegrationTest.php b/tests/Database/DatabaseEloquentIntegrationTest.php
index 9624af06add4..4ef9b1ffc901 100644
--- a/tests/Database/DatabaseEloquentIntegrationTest.php
+++ b/tests/Database/DatabaseEloquentIntegrationTest.php
@@ -1374,8 +1374,8 @@ public function testIsAfterRetrievingTheSameModel()
 
     public function testFreshMethodOnModel()
     {
-        $now = Carbon::now();
-        $nowSerialized = $now->startOfSecond()->toJSON();
+        $now = Carbon::now()->startOfSecond();
+        $nowSerialized = $now->toJSON();
         $nowWithFractionsSerialized = $now->toJSON();
         Carbon::setTestNow($now);
 
diff --git a/tests/Pagination/CursorTest.php b/tests/Pagination/CursorTest.php
index 05c2629619b9..78f7cfc2e4f9 100644
--- a/tests/Pagination/CursorTest.php
+++ b/tests/Pagination/CursorTest.php
@@ -2,8 +2,8 @@
 
 namespace Illuminate\Tests\Pagination;
 
-use Carbon\Carbon;
 use Illuminate\Pagination\Cursor;
+use Illuminate\Support\Carbon;
 use PHPUnit\Framework\TestCase;
 
 class CursorTest extends TestCase
diff --git a/tests/Queue/QueueSqsQueueTest.php b/tests/Queue/QueueSqsQueueTest.php
index 60e02b161ebb..0ae708f91e9f 100755
--- a/tests/Queue/QueueSqsQueueTest.php
+++ b/tests/Queue/QueueSqsQueueTest.php
@@ -94,7 +94,7 @@ public function testDelayedPushWithDateTimeProperlyPushesJobOntoSqs()
         $queue = $this->getMockBuilder(SqsQueue::class)->onlyMethods(['createPayload', 'secondsUntil', 'getQueue'])->setConstructorArgs([$this->sqs, $this->queueName, $this->account])->getMock();
         $queue->setContainer($container = m::spy(Container::class));
         $queue->expects($this->once())->method('createPayload')->with($this->mockedJob, $this->queueName, $this->mockedData)->willReturn($this->mockedPayload);
-        $queue->expects($this->once())->method('secondsUntil')->with($now)->willReturn(5);
+        $queue->expects($this->once())->method('secondsUntil')->with($now->addSeconds(5))->willReturn(5);
         $queue->expects($this->once())->method('getQueue')->with($this->queueName)->willReturn($this->queueUrl);
         $this->sqs->shouldReceive('sendMessage')->once()->with(['QueueUrl' => $this->queueUrl, 'MessageBody' => $this->mockedPayload, 'DelaySeconds' => 5])->andReturn($this->mockedSendMessageResponseModel);
         $id = $queue->later($now->addSeconds(5), $this->mockedJob, $this->mockedData, $this->queueName);
diff --git a/tests/Support/SupportCarbonTest.php b/tests/Support/SupportCarbonTest.php
index cdd865b8b470..a01ca35ec254 100644
--- a/tests/Support/SupportCarbonTest.php
+++ b/tests/Support/SupportCarbonTest.php
@@ -5,7 +5,6 @@
 use BadMethodCallException;
 use Carbon\Carbon as BaseCarbon;
 use Carbon\CarbonImmutable as BaseCarbonImmutable;
-use DateTime;
 use DateTimeInterface;
 use Illuminate\Support\Carbon;
 use PHPUnit\Framework\TestCase;
@@ -34,7 +33,7 @@ protected function tearDown(): void
 
     public function testInstance()
     {
-        $this->assertInstanceOf(DateTime::class, $this->now);
+        $this->assertInstanceOf(Carbon::class, $this->now);
         $this->assertInstanceOf(DateTimeInterface::class, $this->now);
         $this->assertInstanceOf(BaseCarbon::class, $this->now);
         $this->assertInstanceOf(Carbon::class, $this->now);
diff --git a/tests/Support/SupportLazyCollectionTest.php b/tests/Support/SupportLazyCollectionTest.php
index bb85818b7d8f..b7b0ebcbbb29 100644
--- a/tests/Support/SupportLazyCollectionTest.php
+++ b/tests/Support/SupportLazyCollectionTest.php
@@ -2,7 +2,7 @@
 
 namespace Illuminate\Tests\Support;
 
-use Carbon\Carbon;
+use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection;
 use Illuminate\Support\LazyCollection;
 use Mockery as m;