printing all the times when opening index page

    return wrap_into_xml($res);

}

function get_formatted_ts($ts){

    $ts_s  = substr($ts,0,10);

    $ts_ms  = substr($ts,11);

    $ts_formatted = date("Y-m-d H:i:s.$ts_ms",$ts_s);

    return $ts_formatted;

}

function cmd_time(){

    date_default_timezone_set('UTC');

    exec("date +%s.%3N",$ots);

    $t = elphel_get_fpga_time();

    if (!isset($_GET['ts'])){

        //date +%s will report system time

        //print(exec("date +%s"));

        print("Camera time: $t");

    }else{

    $tsys = $ots[0];

    print("Camera time (fpga):  $t (".get_formatted_ts($t).")\n");

    print("Camera time (sys):   $tsys (".get_formatted_ts($tsys).")\n");

    if (isset($_GET['ts'])){

        // ts is in ms

        $ts_s  = substr($_GET['ts'],0,10);

        $ts_ms = substr($_GET['ts'],-3);

        //$ts = $_GET['ts']/1000;

        $ts_formatted = date("Y-m-d H:i:s.$ts_ms",$ts_s);

        print("Your time:   $ts_s.$ts_ms ($ts_formatted)\nCamera time: $t\n");

        $ts_ms = substr($_GET['ts'],11);

        $ts_formatted = get_formatted_ts($_GET['ts']);

        print("Your (browser) time: $ts_s.$ts_ms ($ts_formatted)\n");

        if (isset($_GET['apply'])||(abs($ts_s-$t)>24*3600)){

            elphel_set_fpga_time($_GET['ts']/1000);

            exec("date -s '$ts_formatted'");

            exec("hwclock --systohc");