倒计时绚丽图设计

const endTime = new Date("2017/1/27,18:47:52");

var hours = parseInt( curShowTimeSeconds / 3600); 

  var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60 )  

 var seconds = curShowTimeSeconds % 60 为什么页面显示为00:00:00，求解