找到网站目录/usr/themes/Cuteen/include/在底部合适位置添加第一行JS引用代码，之后再添加JS即可！

<span id="sitetime"></span>  //js 调用...

<script>
    function siteTime(){
        window.setTimeout("siteTime()", 1000);
        var seconds = 1000;
        var minutes = seconds * 60;
        var hours = minutes * 60;
        var days = hours * 24;
        var years = days * 365;
        var today = new Date();
        var todayYear = today.getFullYear();
        var todayMonth = today.getMonth()+1;
        var todayDate = today.getDate();
        var todayHour = today.getHours();
        var todayMinute = today.getMinutes();
        var todaySecond = today.getSeconds();
        var t1 = Date.UTC(2017,11,11,16,16,16); //此处是开始时间，北京时间 2017-11-11 16:16:16
        var t2 = Date.UTC(todayYear,todayMonth,todayDate,todayHour,todayMinute,todaySecond);
        var diff = t2-t1;
        var diffYears = Math.floor(diff/years);
        var diffDays = Math.floor((diff/days)-diffYears*365);
        var diffHours = Math.floor((diff-(diffYears*365+diffDays)*days)/hours);
        var diffMinutes = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours)/minutes);
        var diffSeconds = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours-diffMinutes*minutes)/seconds);
        document.getElementById("sitetime").innerHTML=" 已运行 "+diffYears+" 年 "+diffDays+" 天 "+diffHours+" 小时 "+diffMinutes+" 分钟 "+diffSeconds+" 秒";
    }
    siteTime();
</script>...

PHP代码2

<?php

$launchDate = new DateTime('2023-01-01 00:00:00');
$now = new DateTime();
$diff = $now->diff($launchDate);

// 输出初始时间
echo '<div id="timeDisplay">';
echo '网站已经运行了 ' . $diff->y . ' 年 ' . $diff->m . ' 月 ' . $diff->d . ' 天 ' . $diff->h . ' 小时 ' . $diff->i . ' 分钟 ' . $diff->s . ' 秒。';
echo '</div>';

// 输出 JavaScript 代码
echo '<script>';
echo 'function updateTime() {';
echo '  var now = new Date();';
echo '  var launchDate = new Date("2023-01-01T00:00:00");';
echo '  var diff = Math.floor((now - launchDate) / 1000);';
echo '  var seconds = diff % 60;';
echo '  var minutes = Math.floor(diff / 60) % 60;';
echo '  var hours = Math.floor(diff / 3600) % 24;';
echo '  var days = Math.floor(diff / 86400);';
echo '  document.getElementById("timeDisplay").innerHTML = "网站已经运行了 " + days + " 天 " + hours + " 小时 " + minutes + " 分钟 " + seconds + " 秒.";';
echo '}';
echo 'setInterval(updateTime, 1000);';
echo '</script>';
?>