如何使用 highcharts 在实时图表上更改 xasis 的时间？

Question

如何使用数据库中的时间设置轴和工具提示上的时间？这是我的 dataPLLive.php<?phpheader("Content-type: text/json");$servername = "....";$username = ".....";$password = ".....";$dbname = "...."$conn = mysqli_connect($servername, $username, $password, $dbname);$query = mysqli_query($conn,   ("SELECT a.`JAM`, AVG(a.PacketLoss) AVG                                FROM (                                SELECT  `JAM`,`RNC`,`IPPATH_PM` AS PHB,`VS_IPPM_FORWORD_DROPMEANS` AS PacketLoss, `VSIPPMRttMeans` AS Latency, 'IPPM'                                FROM `rnc_ippm_meas`                                WHERE `JAM`>= CURDATE() AND `IPPATH_PM` LIKE '%AF31%'                                UNION                                SELECT `JAM`,`RNC`,`IPPOOL_PM`,`VSIPPOOLIPPMForwardDrop-Means`,`VSIPPOOLIPPMRttMeans`, 'IPPOOLPM'                                FROM `rnc_ippool_ippm_meas`                                 WHERE `JAM`>= CURDATE() AND `IPPOOL_PM` LIKE '%AF31%') a                                GROUP BY a.`JAM`                                LIMIT 10000"));if (!$query) {    printf("Error: %s\n", mysqli_error($conn));    exit();}$arr = array();while ($row = mysqli_fetch_assoc($query)) {       $value = $row['AVG'];    $x = strtotime($row['JAM']) * 1000;    $y = floatval($value);    $arr[] = array($x, $y);}echo json_encode($arr);  ?>这是输出Imgur，如果有人能解决这个问题，非常感谢，谢谢