Merge pull request #47 from AngelinCalu/patch-3

Refactored the calculation of Orthodox Easter using the function from ChristianHolidays.php.

src/Yasumi/Provider/Greece.php

@@ -91,27 +91,16 @@ public function calculateCleanMonday()
     }
 
     /**
-     * Calculate the Easter date for Orthodox churches.
+     * Orthodox Easter
+     * 
+     * @param int    $year
+     * @param string $timezone
      *
-     * @param int    $year     the year for which Easter needs to be calculated
-     * @param string $timezone the timezone in which Easter is celebrated
-     *
-     * @return \Datetime date of Orthodox Easter
-     *
-     * @link http://php.net/manual/en/function.easter-date.php#83794
-     * @link https://en.wikipedia.org/wiki/Computus#Adaptation_for_Western_Easter_of_Meeus.27_Julian_algorithm
+     * @return \Datetime
      */
     public function calculateEaster($year, $timezone)
     {
-        $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 + $e + 114) % 31) + 1;
-
-        return (new DateTime("$year-$month-$day", new DateTimeZone($timezone)))->add(new DateInterval('P13D'));
+        return $this->calculateOrthodoxEaster($year, $timezone);
     }
 
     /*