index.html

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Calendar</title>
	<link rel="stylesheet" href="style.css">
</head>
<body>
	<div class="calendar">
		<p id="monthName"></p>
		<p id="dayName"></p>
		<p id="dayNumber"></p>
		<p id="year"></p>
	</div>
	<script>
		const lang = navigator.language;
		let date = new Date();

		let dayNumber = date.getDate();
		let month = date.getMonth();
		let dayName = date.toLocaleString(lang, {weekday: 'long'});
		let monthName = date.toLocaleString(lang, {month: 'long'});
		let year = date.getFullYear();

		document.getElementById('monthName').innerHTML = monthName;
		document.getElementById('dayName').innerHTML = dayName;
		document.getElementById('dayNumber').innerHTML =dayNumber;
		document.getElementById('year').innerHTML = year;
	</script>
</body>
</html>