<?php
header("Content-Type: application/xml; charset=utf-8");

$current_date = date('c'); 

echo '<?xml version="1.0" encoding="UTF-8"?>' . PHP_EOL;
?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://aslstudy.com/</loc>
    <lastmod><?php echo $current_date; ?></lastmod>
    <changefreq>daily</changefreq>
    <priority>1.0</priority>
  </url>
</urlset>