Listing 1763

<?php
 
 
    function getEquinox($year, $timezone='GMT')
    {
        switch ( $timezone )
        {
            case 'GMT':
            /*** timestamp of March 20 2008, 7:30am GMT ***/
            $timestamp = 1205958600;
            break;
 
            case 'UTC':
            /*** timestamp of March 20 2008, 5:48am UTC ***/
            $timestamp = 1205952480;
            break;
 
            default:
            $timestamp = 1205958600;
        }
 
        /*** days in a year is 365*400+97)/400 = 365.2425 ***/
        $seconds_in_year = 365.2425*24*60*60;
 
        /*** how many years since 2008 ***/
        $num_years = $year - 2008;
 
        /*** seconds in $num_years ***/
        $elapsed_seconds = $base_year*$seconds_in_year;
 
        /*** add base timestamp plus eleapsed seconds ***/
        $next_equinox = $timestamp + $elapsed_seconds;
 
        return $next_equinox;
    }
 
    echo date('Y m d H m i', getEquinox(2009, 'GMT'));
    echo "<br />\n";
    echo date('Y m d H m i', getEquinox(2009, 'UTC'));
    echo "<br />\n";