function hodiny() {
  var hodiny=new Date();
  var hours=hodiny.getHours();
  var minutes=hodiny.getMinutes();
  var seconds=hodiny.getSeconds();
  var day=hodiny.getDate();
  var month=hodiny.getMonth();
  var year=hodiny.getFullYear();

  setTimeout("hodiny()",1000);
  
  var cnvs = document.getElementById('hodiny');

  cnvs.innerHTML=day+'.'+month+'.'+year+' '+hours+':'+minutes+':'+seconds;
}