<div id="data"><font>2017年10月17日 15:11:11</font></span> 

function showLocale(objD) {  

 var str, colorhead, colorfoot;  

 var yy = objD.getYear();  

 if (yy < 1900) yy = yy + 1900;  var MM = objD.getMonth() + 1;  

 if (MM < 10) MM = '0' + MM;  var dd = objD.getDate();  

 if (dd < 10) dd = '0' + dd;  var hh = objD.getHours();  

 if (hh < 10) hh = '0' + hh;  var mm = objD.getMinutes();  

 if (mm < 10) mm = '0' + mm;  var ss = objD.getSeconds();  

 if (ss < 10) ss = '0' + ss;  var ww = objD.getDay();  

 if (ww == 0) colorhead = "";  

if (ww > 0 && ww < 7) colorhead = "";

str = colorhead + yy + "年" + MM + "月" + dd + "日 " + hh + ":" + mm + ":" + ss + " ";

return (str);

}

function tick() {

var today;

today = new Date();

document.getElementById("new_data").innerHTML = showLocale(today);

window.setTimeout("tick()", 1000);

}

tick();