在主题设置中找到个性化页脚内容设置框,填写如下代码即可

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<script>
function runTime() {
birthday = new Date('2020-05-01 00:00:00');//这里更改网站创建日期
now = new Date();
timeold = (now.getTime() - birthday.getTime());
msperday = 24 * 60 * 60 * 1000
msperhour = 60 * 60 * 1000
msperminute = 60 * 1000
daysold = Math.floor(timeold / msperday);
str = daysold + '天'
timeold = timeold - daysold * msperday
hoursold = Math.floor(timeold / msperhour);
str += hoursold + '时'
timeold = timeold - hoursold * msperhour
minutesold = Math.floor(timeold / msperminute);
str += minutesold + '分'
timeold = timeold - minutesold * msperminute
secondsold = Math.floor(timeold / 1000);
str += secondsold + '秒'
return str
}
setInterval(function () {$('#run_time').html(runTime())}, 1000);
</script>
<span>本博客已运行:<span id="run_time"></span></span>

基于CSDN博主「潘超博客」的原创文章修改
原文链接:https://blog.csdn.net/panchao888888/article/details/91129368