diff --git a/tests/ArrayAccessItemsTest.php b/tests/ArrayAccessItemsTest.php
index c4d7a97..1bdc354 100644
--- a/tests/ArrayAccessItemsTest.php
+++ b/tests/ArrayAccessItemsTest.php
@@ -5,13 +5,17 @@
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class ArrayAccessItemsTest extends TestCase
 {
     public function testBasicArrayAccessItems(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-18"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-18"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $result = $builder->build($this->getData());
 
         $this->assertSame(
@@ -25,7 +29,9 @@ public function testArrayAccessItemsWithIndexChanged(): void
         $builder = new HeatmapBuilder(
             now: Carbon::parse("2022-11-18"),
             arrayAccessIndex: "updated_at",
+            timezone: new CarbonTimeZone("1"),
         );
+
         $result = $builder->build($this->getData());
 
         $this->assertSame(
@@ -36,7 +42,10 @@ public function testArrayAccessItemsWithIndexChanged(): void
 
     public function testArrayAccessItemsWithIndexChangedByMethod(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-18"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-18"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->changeArrayAccessIndex("updated_at");
 
         $result = $builder->build($this->getData());
diff --git a/tests/ContractedItemsTest.php b/tests/ContractedItemsTest.php
index 75a20b9..0486fb8 100644
--- a/tests/ContractedItemsTest.php
+++ b/tests/ContractedItemsTest.php
@@ -6,13 +6,17 @@
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class ContractedItemsTest extends TestCase
 {
     public function testBasicContractedItems(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-18"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-18"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $result = $builder->build($this->getData());
 
         $this->assertSame(
diff --git a/tests/DecoratorTest.php b/tests/DecoratorTest.php
index b02435e..c9ce1a0 100644
--- a/tests/DecoratorTest.php
+++ b/tests/DecoratorTest.php
@@ -6,6 +6,7 @@
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class DecoratorTest extends TestCase
@@ -33,6 +34,7 @@ public function testBasicArrayAccessItems(): void
         $builder = new HeatmapBuilder(
             now: Carbon::parse("2022-11-18"),
             decorator: new TailwindDecorator("green"),
+            timezone: new CarbonTimeZone("1"),
         );
 
         $result = $builder->build($data);
diff --git a/tests/NowChangedTest.php b/tests/NowChangedTest.php
index d28655c..f2f9010 100644
--- a/tests/NowChangedTest.php
+++ b/tests/NowChangedTest.php
@@ -5,13 +5,17 @@
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class NowChangedTest extends TestCase
 {
     public function testChangingNow(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $result = $builder->build($this->getData());
 
         $this->assertSame(
@@ -23,7 +27,10 @@ public function testChangingNow(): void
     public function testChangingNowByMethod(): void
     {
         $builder = new HeatmapBuilder();
-        $builder->changeNow(Carbon::parse("2022-11-20"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-20"),
+            timezone: new CarbonTimeZone("1"),
+        );
 
         $result = $builder->build($this->getData());
 
diff --git a/tests/PeriodActionsTest.php b/tests/PeriodActionsTest.php
index fd62c7c..115106e 100644
--- a/tests/PeriodActionsTest.php
+++ b/tests/PeriodActionsTest.php
@@ -4,13 +4,17 @@
 
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class PeriodActionsTest extends TestCase
 {
     public function testChangingPeriodForMonth(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastMonth();
 
         $result = $builder->build($this->getData());
@@ -23,7 +27,10 @@ public function testChangingPeriodForMonth(): void
 
     public function testChangingPeriodForShorterMonth(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-03-01 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-03-01 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastMonth();
 
         $result = $builder->build($this->getData());
@@ -36,7 +43,10 @@ public function testChangingPeriodForShorterMonth(): void
 
     public function testChangingPeriodForYear(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastYear();
 
         $result = $builder->build($this->getData());
@@ -49,7 +59,10 @@ public function testChangingPeriodForYear(): void
 
     public function testChangingPeriodForLeapYear(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2020-05-01 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2020-05-01 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastYear();
 
         $result = $builder->build($this->getData());
@@ -62,7 +75,10 @@ public function testChangingPeriodForLeapYear(): void
 
     public function testChangingPeriodForNumberOfTiles(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-03-01 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2020-03-01 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forNumberOfTiles(100);
 
         $result = $builder->build($this->getData());
diff --git a/tests/PeriodAligningTest.php b/tests/PeriodAligningTest.php
index fb90478..1922d90 100644
--- a/tests/PeriodAligningTest.php
+++ b/tests/PeriodAligningTest.php
@@ -4,13 +4,17 @@
 
 use Blumilk\HeatmapBuilder\HeatmapBuilder;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class PeriodAligningTest extends TestCase
 {
     public function testAligningPeriodForDailyHeatmap(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastMonth()->alignedToStartOfPeriod();
 
         $result = $builder->build($this->getData());
@@ -23,7 +27,10 @@ public function testAligningPeriodForDailyHeatmap(): void
 
     public function testAligningPeriodForDailyHeatmapFromBothSides(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forLastMonth()->alignedToStartOfPeriod()->alignedToEndOfPeriod();
 
         $result = $builder->build($this->getData());
@@ -36,7 +43,10 @@ public function testAligningPeriodForDailyHeatmapFromBothSides(): void
 
     public function testAligningPeriodForNumberOfTiles(): void
     {
-        $builder = new HeatmapBuilder(now: Carbon::parse("2022-11-19 00:00:00"));
+        $builder = new HeatmapBuilder(
+            now: Carbon::parse("2022-11-19 00:00:00"),
+            timezone: new CarbonTimeZone("1"),
+        );
         $builder->forNumberOfTiles(4)->alignedToStartOfPeriod();
 
         $result = $builder->build($this->getData());
diff --git a/tests/PeriodChangedTest.php b/tests/PeriodChangedTest.php
index a1ada5d..702b74a 100644
--- a/tests/PeriodChangedTest.php
+++ b/tests/PeriodChangedTest.php
@@ -6,6 +6,7 @@
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
 use Carbon\CarbonPeriod;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class PeriodChangedTest extends TestCase
@@ -14,7 +15,10 @@ public function testChangingPeriod(): void
     {
         $start = Carbon::parse("2022-11-01");
         $end = Carbon::parse("2022-11-11");
-        $builder = new HeatmapBuilder(period: new CarbonPeriod($start, "1 day", $end));
+        $builder = new HeatmapBuilder(
+            period: new CarbonPeriod($start, "1 day", $end),
+            timezone: new CarbonTimeZone("1"),
+        );
 
         $result = $builder->build($this->getData());
 
@@ -29,7 +33,7 @@ public function testChangingPeriodByMethod(): void
         $start = Carbon::parse("2022-11-01");
         $end = Carbon::parse("2022-11-11");
 
-        $builder = new HeatmapBuilder();
+        $builder = new HeatmapBuilder(timezone: new CarbonTimeZone("1"));
         $builder->changePeriod(new CarbonPeriod($start, "1 day", $end));
 
         $result = $builder->build($this->getData());
diff --git a/tests/PeriodIntervalTest.php b/tests/PeriodIntervalTest.php
index e7e9771..5a01375 100644
--- a/tests/PeriodIntervalTest.php
+++ b/tests/PeriodIntervalTest.php
@@ -6,6 +6,7 @@
 use Blumilk\HeatmapBuilder\PeriodInterval;
 use Blumilk\HeatmapBuilder\Tile;
 use Carbon\Carbon;
+use Carbon\CarbonTimeZone;
 use PHPUnit\Framework\TestCase;
 
 class PeriodIntervalTest extends TestCase
@@ -15,6 +16,7 @@ public function testChangingPeriodForMonth(): void
         $builder = new HeatmapBuilder(
             now: Carbon::parse("2022-11-19"),
             periodInterval: PeriodInterval::Monthly,
+            timezone: new CarbonTimeZone("1"),
         );
         $builder->forLastYear();