如何使用javascript或php根据日期隐藏/显示div？

<div id="myDiv">要隐藏/显示的内容</div>

function toggleDiv() {
  var currentDate = new Date();
  var targetDate = new Date("2022-01-01");  // 设置目标日期

  if (currentDate >= targetDate) {
    document.getElementById("myDiv").style.display = "block";  // 显示 div
  } else {
    document.getElementById("myDiv").style.display = "none";  // 隐藏 div
  }
}

<script>
window.onload = function() {
  toggleDiv();
};
</script>

<div id="myDiv" style="<?php echo ($currentDate >= $targetDate) ? 'display:block' : 'display:none'; ?>">要隐藏/显示的内容</div>

<?php
$currentDate = date("Y-m-d");
$targetDate = "2022-01-01";  // 设置目标日期
?>