function orthodox_easter() | vrypan|net|weblog (αρχείο)

Given a year, orthodox_easter calculates the timestamp of this year’s Orthodox Easter.

function orthodox_easter($year) { /* The Date of Orthodox Easter: An algorithm based on Oudin's Algorithm Based on http://www.smart.net/~mmontes/ortheast.html#ALG


        18-Oct-2003, Panayotis Vryonis &lt;panayotis @ vrypan.net &gt;
        ex. usage: echo date ("l dS of F Y h:i:s A",orthodox_easter(2004) )

        */

        $G = $year % 19 ;

        $I = (19*$G + 15) % 30 ;

        $J = ($year + floor($year/4) + $I) % 7 ;

        $L = $I - $J ;

        $EasterMonth = 3 + floor( ($L + 40)/44 );

        $EasterDay = $L + 28 - 31*floor($EasterMonth/4) ;
        if ($year&lt;2100) $toGregorian=13 ;

        else $toGregorian=14 ;

$ret = mktime(0,0,0,$EasterMonth,$EasterDay+$toGregorian,$year) ; return $ret ; }