Javascript 如何更改plotly js中的XAXIS值，以另一种方式显示日期？

我有一个select，它使用以下sql语句选择到目前为止传递的时间（以毫秒为单位）：

$stmt = $dbh->prepare("SELECT from_unixtime(dd.ts, '%D %H:%i'), 
                              dd.a_menos 
                       FROM dev_data dd, users u, users_dev ud 
                       WHERE u.id = ud.id_user 
                        AND ud.id_dev = dd.id_dev 
                        AND u.id = :id 
                        AND dd.ts BETWEEN :tsmin AND :tsmax");

它向我展示了如下结果：

正如你所看到的，日期看起来有点错误

我想实现的是，在XAXIS中，它只显示天数，当你增加图表的缩放比例时，你可以看到小时数，这可能吗

我的代码-->

<?php
    require_once "connection.php";
    $dbh= connect();

    require "code.php";
    $tsmin=tsPrimerDiaMes(4);
    $tsmax=maxTs(4);
    $data = array('id' => 4, 'tsmin' => $tsmin, 'tsmax' => $tsmax);
    $stmt = $dbh->prepare("SELECT from_unixtime(dd.ts, '%D %H:%i'), dd.a_menos FROM dev_data dd, users u, users_dev ud WHERE u.id = ud.id_user AND ud.id_dev = dd.id_dev AND u.id = :id AND dd.ts BETWEEN :tsmin AND :tsmax");
    $stmt->execute($data);
    $valoresX=array();
    $valoresY=array();
    while($fila = $stmt->fetch()){
        $valoresX[]=$fila[0];
        $valoresY[]=$fila[1];
    }
    $datosX=json_encode($valoresX);
    $datosY=json_encode($valoresY);

?>
<div id="graficaLineal"></div>

<script type="text/javascript">
    function crearCadenaLineal(json){
        var parsed = JSON.parse(json);
        var arr = [];
        for(var x in parsed){
            arr.push(parsed[x]);
        }
        return arr;
    }
</script>
<script type="text/javascript">
    datosX=crearCadenaLineal('<?php echo $datosX ?>')
    datosY=crearCadenaLineal('<?php echo $datosY ?>')
    var prueba = {
        x: datosX,
        y: datosY,
        type: 'scatter',
        line: {
            color: 'blue',
            width:2
        }
    };
    var data = [prueba];
    var layout = {
        title: 'Generacion',
        plot_bgcolor:"lightblue",
        paper_bgcolor:"lightgreen",
        xaxis: {
            title: 'Dias',
            type: 'datetime'
        },
        yaxis: {
            title: 'KW'
        }
    }
    Plotly.newPlot('graficaLineal', data, layout);
</script>