编辑代码

<?php
date_default_timezone_set('PRC');
header("content-type:text/html; charset=utf-8");
echo date('Y-m-d H:i:s', 1691337600);
echo "<br/>";
$str = 'Y-m-d 00:00:00';
echo date('Y-m-d'.' 00:00:00');
echo "<br/>";
echo date('Y-m-d'.' 23:59:59');
echo "<br/>";