set-footer

rt。对于Fluid主题，在\node_modules\hexo-theme-fluid\layout\_partials\footer.ejs里添加这么一段（我是在<% if(theme.footer.beian.enable) { %>前添加的）：

<span id="timeDate">载入天数...</span><span id="times">载入时分秒...</span>
<script>
    var now = new Date(); 
    function createtime() { 
        var grt= new Date("08/10/2018 17:38:00");//在此处修改你的建站时间
        now.setTime(now.getTime()+250); 
        days = (now - grt ) / 1000 / 60 / 60 / 24; dnum = Math.floor(days); 
        hours = (now - grt ) / 1000 / 60 / 60 - (24 * dnum); hnum = Math.floor(hours); 
        if(String(hnum).length ==1 ){hnum = "0" + hnum;} minutes = (now - grt ) / 1000 /60 - (24 * 60 * dnum) - (60 * hnum); 
        mnum = Math.floor(minutes); if(String(mnum).length ==1 ){mnum = "0" + mnum;} 
        seconds = (now - grt ) / 1000 - (24 * 60 * 60 * dnum) - (60 * 60 * hnum) - (60 * mnum); 
        snum = Math.round(seconds); if(String(snum).length ==1 ){snum = "0" + snum;} 
        document.getElementById("timeDate").innerHTML = "本站竟然已安全运行 "+dnum+" 天 "; 
        document.getElementById("times").innerHTML = hnum + " 小时 " + mnum + " 分 " + snum + " 秒"; 
    } 
setInterval("createtime()",250);
</script>

即可实现运行时间计数。

Reference

Hexo博客优化-添加网站运行时间