diff --git a/src/OpeningHours.php b/src/OpeningHours.php
index ed7b509..f84fe94 100644
--- a/src/OpeningHours.php
+++ b/src/OpeningHours.php
@@ -4,6 +4,7 @@
 
 use DateTime;
 use DateTimeInterface;
+use DateTimeZone;
 use Spatie\OpeningHours\Exceptions\Exception;
 use Spatie\OpeningHours\Exceptions\InvalidDate;
 use Spatie\OpeningHours\Exceptions\InvalidDayName;
@@ -17,8 +18,13 @@ class OpeningHours
     /** @var array */
     protected $exceptions = [];
 
-    public function __construct()
+    /** @var DateTimeZone|null */
+    protected $timezone;
+
+    public function __construct($timezone = null)
     {
+        $this->timezone = $timezone ? new DateTimeZone($timezone) : null;
+
         $this->openingHours = Day::mapDays(function () {
             return new OpeningHoursForDay();
         });
@@ -77,6 +83,8 @@ public function forDay(string $day): OpeningHoursForDay
 
     public function forDate(DateTimeInterface $date): OpeningHoursForDay
     {
+        $date = $this->applyTimezone($date);
+
         return $this->exceptions[$date->format('Y-m-d')] ?? $this->forDay(Day::onDateTime($date));
     }
 
@@ -97,6 +105,8 @@ public function isClosedOn(string $day): bool
 
     public function isOpenAt(DateTimeInterface $dateTime): bool
     {
+        $dateTime = $this->applyTimezone($dateTime);
+
         $openingHoursForDay = $this->forDate($dateTime);
 
         return $openingHoursForDay->isOpenAt(Time::fromDateTime($dateTime));
@@ -117,6 +127,11 @@ public function isClosed(): bool
         return $this->isClosedAt(new DateTime());
     }
 
+    public function setTimezone($timezone)
+    {
+        $this->timezone = new DateTimeZone($timezone);
+    }
+
     protected function parseOpeningHoursAndExceptions(array $data): array
     {
         $exceptions = Arr::pull($data, 'exceptions', []);
@@ -159,4 +174,13 @@ protected function normalizeDayName(string $day)
 
         return $day;
     }
+
+    protected function applyTimezone(DateTimeInterface $date)
+    {
+        if ($this->timezone) {
+            $date = $date->setTimezone($this->timezone);
+        }
+
+        return $date;
+    }
 }
diff --git a/tests/OpeningHoursTest.php b/tests/OpeningHoursTest.php
index 86784e6..c4bd651 100644
--- a/tests/OpeningHoursTest.php
+++ b/tests/OpeningHoursTest.php
@@ -3,6 +3,7 @@
 namespace Spatie\OpeningHours\Test;
 
 use DateTime;
+use DateTimeZone;
 use Spatie\OpeningHours\OpeningHours;
 
 class OpeningHoursTest extends \PHPUnit_Framework_TestCase
@@ -136,4 +137,35 @@ public function it_can_determine_that_its_open_at_a_certain_date_and_time_on_an_
         $this->assertFalse($openingHours->isOpenAt($shouldBeClosed));
         $this->assertTrue($openingHours->isClosedAt($shouldBeClosed));
     }
+
+    /** @test */
+    public function it_can_set_the_timezone_on_the_openings_hours_object()
+    {
+        $openingHours = new OpeningHours('Europe/Amsterdam');
+        $openingHours->fill([
+            'monday' => ['09:00-18:00'],
+            'exceptions' => [
+                 '2016-11-14' => ['09:00-13:00'],
+            ],
+        ]);
+
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 10:00')));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 15:59')));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 08:00')));
+        $this->assertFalse($openingHours->isOpenAt(new DateTime('2016-10-10 06:00')));
+
+        $this->assertFalse($openingHours->isOpenAt(new DateTime('2016-10-10 06:00', new DateTimeZone('Europe/Amsterdam'))));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 09:00', new DateTimeZone('Europe/Amsterdam'))));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 17:59', new DateTimeZone('Europe/Amsterdam'))));
+
+        $this->assertFalse($openingHours->isOpenAt(new DateTime('2016-11-14 17:59', new DateTimeZone('Europe/Amsterdam'))));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-11-14 12:59', new DateTimeZone('Europe/Amsterdam'))));
+
+        $this->assertFalse($openingHours->isOpenAt(new DateTime('2016-11-14 15:59', new DateTimeZone('America/Denver'))));
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 09:59', new DateTimeZone('America/Denver'))));
+
+        date_default_timezone_set('America/Denver');
+        $this->assertTrue($openingHours->isOpenAt(new DateTime('2016-10-10 09:59')));
+        $this->assertFalse($openingHours->isOpenAt(new DateTime('2016-10-10 10:00')));
+    }
 }