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if ($dt && $eventtype != 5 && $eventtype != 7) {
    $sql_cond = " and b.datefrom='$dt'";
}

if ($eventtype == 5 || $eventtype == 7) {

    if (!$dt || $dt == "0") {

        $w = date("w");

        $mon_dl = 7 - $w;

        for ($j = 0; $j <= (7 - $w); $j++) {
            $d = date("Ymd", mktime(0, 0, 0, date("m"), date("d") + $j, date("Y")));
            $dates .= ($dates ? "," . $d : $d);
        }

        if ($dates) $sql_cond .= " and b.datefrom in ($dates)";
    }

    if ($dt == "1") {
        $w = date("w");
        if ($w == 0) {
            $monday = date("Ymd", mktime(0, 0, 0, date("m"), date("d") + 1, date("Y")));
        } else {
            $monday = date("Ymd", mktime(0, 0, 0, date("m"), date("d") + (7 - $w) + 1, date("Y")));
        }


        for ($j = 0; $j <= 6; $j++) {
            $d = date("Ymd", mktime(0, 0, 0, substr($monday, 4, 2), substr($monday, 6, 2) + $j, substr($monday, 0, 4)));
            $dates .= ($dates ? "," . $d : $d);
        }

        if ($dates) $sql_cond .= " and b.datefrom in ($dates)";
    }

    if ($dt == "2") {

        $w = date("w");
        if ($w == 0) {
            $monday = date("Ymd", mktime(0, 0, 0, date("m"), date("d") + 1, date("Y")));
        } else {
            $monday = date("Ymd", mktime(0, 0, 0, date("m"), date("d") + (7 - $w) + 1, date("Y")));
        }

        for ($j = 7; $j <= 13; $j++) {
            $d = date("Ymd", mktime(0, 0, 0, substr($monday, 4, 2), substr($monday, 6, 2) + $j, substr($monday, 0, 4)));
            $dates .= ($dates ? "," . $d : $d);
        }

        if ($dates) $sql_cond .= " and b.datefrom in ($dates)";
    }
}