时间同步更新

<div class="time">
                    <dl>
                        <dd>
                            UTC时间 <span id="UTCTime">HH：MM：SS</span></dd>
                        <dd>
                            北京时间 <span id="BJTime">HH：MM：SS</span></dd><div class="clear">
                            </div>
                    </dl>
                </div>
                <script type="text/javascript">
                    $(document).ready(function () {
                        setInterval(function () {
                            fnDate();
                        }, 1000);
                    });
                    function fnDate() {
                        var date = new Date();
                        var hours = date.getHours(); //小时
                        var minute = date.getMinutes(); //分
                        var second = date.getSeconds(); //秒
                        var time = fnW(hours) + ": " + fnW(minute) + ": " + fnW(second);
                        $("#BJTime").html(time);
                        var UTChours = date.getUTCHours();
                        var UTCminute = date.getUTCMinutes();
                        var UTCsecond = date.getUTCSeconds();
                        time = fnW(UTChours) + ": " + fnW(UTCminute) + ": " + fnW(UTCsecond);
                        $("#UTCTime").html(time);
                    };
                    function fnW(str) {
                        var num;
                        str >= 10 ? num = str : num = "0" + str;
                        return num;
                    } 
                </script>