samdo,
Дата и время
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<div id="mess">"Текст 1"</div>
<script>
function attention()
{
let now = new Date();
let data = new Date();
data.setHours(12, 0, 0, 0);
let delta = data - now;
if(delta > 0) {
window.setTimeout(_ => mess.innerHTML = 'Текст 2', delta);
delta += 2 * 60 * 60 * 1000;
window.setTimeout(_ => mess.innerHTML = 'Текст 1', delta);
return
}
data.setHours(16, 0, 0, 0);
delta = data - now;
if(delta > 0) {
mess.innerHTML = 'Текст 2';
window.setTimeout(_ => mess.innerHTML = 'Текст 1', delta);
}
}
attention()
</script>
</body>
</html>