To both put a space character between your time and date, and to break the line between the Date/Time and the Visitor count change the lines:
echo date("H:i");
echo gmdate("M d Y");
to
echo date("H:i") . " ";
echo gmdate("M d Y") . "<br/>";
That will put a space between the time and the date,
and will put a HTML line break before the Visitor message.