Index: branches/RC/core/kernel/globals.php
===================================================================
diff -u -r8929 -r9558
--- branches/RC/core/kernel/globals.php	(.../globals.php)	(revision 8929)
+++ branches/RC/core/kernel/globals.php	(.../globals.php)	(revision 9558)
@@ -575,4 +575,34 @@
 
 		return $headers;
 	}
+
+	if (!function_exists('easter_date')) {
+		// calculates easter date, when calendar extension not installed in php
+		// see also: http://php.prod.intechnic.lv/manual/en/function.easter-date.php
+		function easter_date ($Year) {
+			/*
+			G is the Golden Number-1
+			H is 23-Epact (modulo 30)
+			I is the number of days from 21 March to the Paschal full moon
+			J is the weekday for the Paschal full moon (0=Sunday,
+			1=Monday, etc.)
+			L is the number of days from 21 March to the Sunday on or before
+			the Paschal full moon (a number between -6 and 28)
+			*/
+
+
+			$G = $Year % 19;
+			$C = (int)($Year / 100);
+			$H = (int)($C - ($C / 4) - ((8*$C+13) / 25) + 19*$G + 15) % 30;
+			$I = (int)$H - (int)($H / 28)*(1 - (int)($H / 28)*(int)(29 / ($H + 1))*((int)(21 - $G) / 11));
+			$J = ($Year + (int)($Year/4) + $I + 2 - $C + (int)($C/4)) % 7;
+			$L = $I - $J;
+			$m = 3 + (int)(($L + 40) / 44);
+			$d = $L + 28 - 31 * ((int)($m / 4));
+			$y = $Year;
+			$E = mktime(0,0,0, $m, $d, $y);
+
+			return $E;
+		}
+	}
 ?>
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