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<!DOCTYPE html>
<html lang="en">
<head>
<title>Find Sundays on January 1st</title>
<style>
body { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; background: #f0f0f0; font-family: Arial; }
input, button { padding: 10px; margin: 5px; font-size: 16px; }
#result { margin-top: 20px; font-size: 18px; color: green; }
</style>
</head>
<body>
<h1>Find Sundays on January 1st</h1>
<input type="number" id="startYear" placeholder="Start Year">
<input type="number" id="endYear" placeholder="End Year">
<button onclick="findSundays()">Find Sundays</button>
<div id="result"></div>
<script>
function findSundays() {
const start = +startYear.value, end = +endYear.value, result = document.getElementById("result");
if (isNaN(start) || isNaN(end) || start > end) return result.innerHTML = 'Please enter valid years.';
const sundays = [];
for (let year = start; year <= end; year++) if (new Date(year, 0, 1).getDay() === 0) sundays.push(year);
result.innerHTML = sundays.length ? 'Sundays on January 1st: ' + sundays : 'No Sundays found.';
}
</script>
</body>
</html>
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