JS代码两款显示计算至今已运行多少天

利熙网已运行:<span class="smalltxt">
<SCRIPT language=javascript>
BirthDay=new Date("may 31,2014");
today=new Date();
timeold=(today.getTime()-BirthDay.getTime());
sectimeold=timeold/1000
secondsold=Math.floor(sectimeold);
msPerDay=24*60*60*1000
e_daysold=timeold/msPerDay
daysold=Math.floor(e_daysold);
document.write("<font color=red>"+daysold+"</font>天 !");
</SCRIPT>

第二款：精准到秒计时

<span id="momk"></span>
<script type="text/javascript">
function NewDate(str) {
str = str.split('-');
var date = new Date();
date.setUTCFullYear(str[0], str[1] - 1, str[2]);
date.setUTCHours(0, 0, 0, 0);
return date;
}
function momxc() {
var birthDay =NewDate("2017-12-26");//网站搭建的时间 有误差需提前一天
var today=new Date();
var timeold=today.getTime()-birthDay.getTime();
var sectimeold=timeold/1000
var secondsold=Math.floor(sectimeold);
var msPerDay=24*60*60*1000; var e_daysold=timeold/msPerDay;
var daysold=Math.floor(e_daysold);
var e_hrsold=(daysold-e_daysold)*-24;
var hrsold=Math.floor(e_hrsold);
var e_minsold=(hrsold-e_hrsold)*-60;
var minsold=Math.floor((hrsold-e_hrsold)*-60); var seconds=Math.floor((minsold-e_minsold)*-60).toString();
document.getElementById("momk").innerHTML = "利熙网已运行"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒";
setTimeout(momxc, 1000);
}momxc();
</script>