微信页面倒计时代码（解决safari不兼容date的问题

<div class="aTime">
   <em id="t_d"></em>
   <em id="t_h"></em>
   <em id="t_m"></em>
   <em id="t_s"></em>
</div>

<script type="text/javascript">
 function GetRTime(){
  var end = "<?php echo $info['end_date']; ?>"+" 23:59:59";
  var EndTime= new Date(end);
  var NowTime = new Date();
  var t =EndTime.getTime() - NowTime.getTime();
  var d=0;
  var h=0;
  var m=0;
  var s=0;
  if(t>=0){
   d=Math.floor(t/1000/60/60/24);
   h=Math.floor(t/1000/60/60%24);
   m=Math.floor(t/1000/60%60);
   s=Math.floor(t/1000%60);
  }
  document.getElementById("t_d").innerHTML = d;
  document.getElementById("t_h").innerHTML = h;
  document.getElementById("t_m").innerHTML = m;
  document.getElementById("t_s").innerHTML = s;
 }
 setInterval(GetRTime,1000);
</script>