JS获取客户端系统当前时区

<script>
function getClientTimezone(){
  var oDate = new Date();
  var nTimezone = -oDate.getTimezoneOffset() / 60;
  return nTimezone.toFixed(2);
}
alert(getClientTimezone());
</script>

<script type="text/javascript">
    var d = new Date();
    document.write(-d.getTimezoneOffset()/60);
</script>