diff --git a/src/Provider/AbstractEaster.php b/src/Provider/AbstractEaster.php
index 2ffa45a..b3de8bb 100644
--- a/src/Provider/AbstractEaster.php
+++ b/src/Provider/AbstractEaster.php
@@ -7,18 +7,53 @@
  */
 abstract class AbstractEaster extends AbstractProvider
 {
+    /**
+     * Creating easter sunday
+     *
+     * @param $year
+     * @return \DateTime
+     */
+    private function createSunday($year)
+    {
+        $easterSunday = new \DateTime('21.03.' . $year);
+        $easterSunday->modify(sprintf('+%d days', easter_days($year)));
+
+        return $easterSunday;
+    }
+
+    /**
+     * Creating Orthodox easter sunday
+     *
+     * @param $year
+     * @return \DateTime
+     */
+    private function createOrthodoxSunday($year)
+    {
+        $a = $year % 4;
+        $b = $year % 7;
+        $c = $year % 19;
+        $d = (19 * $c + 15) % 30;
+        $e = (2 * $a + 4 * $b - $d + 34) % 7;
+        $month = floor(($d + $e + 114) / 31);
+        $day = (($d + $e + 114) % 31) + 1;
+
+        $sunday = mktime(0, 0, 0, $month, $day + 13, $year);
+
+        return new \DateTime(date('Y-m-d', $sunday));
+    }
 
     /**
      * Returns all dates calculated by easter sunday
      *
      * @param int $year
+     * @param boolean $orthodox
      *
      * @return \DateTime[]
      */
-    protected function getEasterDates($year)
+    protected function getEasterDates($year, $orthodox = false)
     {
-        $easterSunday = new \DateTime('21.03.'.$year);
-        $easterSunday->modify(sprintf('+%d days', easter_days($year)));
+        $easterSunday = $orthodox ? $this->createOrthodoxSunday($year) :  $this->createSunday($year);
+
         $easterSunday->setTimezone(new \DateTimeZone(date_default_timezone_get()));
 
         $easterMonday = clone $easterSunday;
@@ -43,16 +78,16 @@ protected function getEasterDates($year)
         $corpusChristi->modify('+60 days');
 
         return array(
-            'maundyThursday'    => $maundyThursday,
-            'easterSunday'      => $easterSunday,
-            'easterMonday'      => $easterMonday,
-            'saturday'          => $saturday,
-            'goodFriday'        => $goodFriday,
-            'ascensionDay'      => $ascensionDay,
+            'maundyThursday' => $maundyThursday,
+            'easterSunday' => $easterSunday,
+            'easterMonday' => $easterMonday,
+            'saturday' => $saturday,
+            'goodFriday' => $goodFriday,
+            'ascensionDay' => $ascensionDay,
             'pentecostSaturday' => $pentecostSaturday,
-            'pentecostSunday'   => $pentecostSunday,
-            'pentecostMonday'   => $pentecostMonday,
-            'corpusChristi'     => $corpusChristi
+            'pentecostSunday' => $pentecostSunday,
+            'pentecostMonday' => $pentecostMonday,
+            'corpusChristi' => $corpusChristi
         );
     }
 
diff --git a/src/Provider/RO.php b/src/Provider/RO.php
index 2a32035..67a1714 100644
--- a/src/Provider/RO.php
+++ b/src/Provider/RO.php
@@ -20,7 +20,8 @@ class RO extends AbstractEaster
      */
     public function getHolidaysByYear($year)
     {
-        $easter = $this->getEasterDates($year);
+        // make i
+        $easter = $this->getEasterDates($year, true);
 
         $holidays = array(
             '01-01' => $this->createData('Anul Nou'),
@@ -35,6 +36,7 @@ public function getHolidaysByYear($year)
             '12-26' => $this->createData('Crăciunul'),
 
             // Easter dates
+            $easter['goodFriday']->format(self::DATE_FORMAT) => $this->createData('Paștele'),
             $easter['easterSunday']->format(self::DATE_FORMAT) => $this->createData('Paștele'),
             $easter['easterMonday']->format(self::DATE_FORMAT) => $this->createData('Paștele'),
 
diff --git a/test/Provider/ROTest.php b/test/Provider/ROTest.php
index ae66ea8..7863520 100644
--- a/test/Provider/ROTest.php
+++ b/test/Provider/ROTest.php
@@ -18,6 +18,8 @@ public function setUp()
     /**
      * Provides some test dates and the expectation
      *
+     * vendor/bin/phpunit --filter ROTest
+     *
      * @return array
      */
     public function dateProvider()
@@ -40,16 +42,18 @@ public function dateProvider()
             array('2018-12-26', null, array('name' => 'Crăciunul')),
 
             // Easter dates 2018
-            array('2018-04-01', null, array('name' => 'Paștele')),
-            array('2018-04-02', null, array('name' => 'Paștele')),
-            array('2018-05-20', null, array('name' => 'Rusaliile')),
-            array('2018-05-21', null, array('name' => 'Rusaliile')),
+            array('2018-04-06', null, array('name' => 'Paștele')),
+            array('2018-04-08', null, array('name' => 'Paștele')),
+            array('2018-04-09', null, array('name' => 'Paștele')),
+            array('2018-05-27', null, array('name' => 'Rusaliile')),
+            array('2018-05-28', null, array('name' => 'Rusaliile')),
 
             // Easter dates 2019
-            array('2019-04-21', null, array('name' => 'Paștele')),
-            array('2019-04-22', null, array('name' => 'Paștele')),
-            array('2019-06-09', null, array('name' => 'Rusaliile')),
-            array('2019-06-10', null, array('name' => 'Rusaliile')),
+            array('2019-04-26', null, array('name' => 'Paștele')),
+            array('2019-04-28', null, array('name' => 'Paștele')),
+            array('2019-04-29', null, array('name' => 'Paștele')),
+            array('2019-06-16', null, array('name' => 'Rusaliile')),
+            array('2019-06-17', null, array('name' => 'Rusaliile')),
         );
     }
 }