<h1>000-00-00</h1>
<h2>000-00-00</h2>
<h3>000-00-00</h3>
<h4>000-00-00</h4>
<h5>000-00-00</h5>
<h6>000-00-00</h6>
<div>000-00-00</div>
<p>000-00-00</p>
000-00-00

const walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT);

while (walker.nextNode()) {
  const text = walker.currentNode.textContent.trim();

  if (text === '000-00-00') {
    walker.currentNode.textContent = '111-11-11';
  }
}