PHP - Determine the next quarter
function nextQuarter() {
    $sCurrentDate = date('Y-m-d H:i:s');
    $iCurrentTime = strtotime($sCurrentDate);
    $iFrac = 900;
    $r = $iCurrentTime % $iFrac;
    $iNewTime = $iCurrentTime + ($iFrac-$r);
    $sNewDate = date('Y-m-d H:i:s', $iNewTime);
    return $sNewDate;
}