Handling dates in MPAndroidChart X axis

I have a line graph, which shows 2 lines. The data comes from Sqlite where I have the 2 columns that feed the lines, apart from the id, another 2 more one with dates in String and the other with dates in long. In the image the x-axis shows the values of the id but I would like to show the dates in this format as indicated by the green arrow.

If I try to show the date column in String it gives me an exception. If I show it as long does not show anything. Is there a method to show the dates?

    LineChart lineChart = (LineChart) view.findViewById(R.id.chart);

    int count = cursor.getCount();
    int[] fechas = new int[count];
    int[] y_sisto = new int[count];
    int[] y_diasto = new int[count];

    if (cursor.moveToFirst()) {
        for (int i = 0; i < count; i++) {
            fechas[i] = cursor.getInt(6);  //0 = id, 4 = fecha string, 6 = fecha long
            y_sisto[i] = cursor.getInt(1);
            y_diasto[i] = cursor.getInt(2);

            cursor.moveToNext();
        }

        ArrayList<Entry> values = new ArrayList<Entry>();
        for (int i = 0; i < count; i++) {
            values.add(new Entry(fechas[i], y_sisto[i]));
        }
        LineDataSet set1 = new LineDataSet(values, "Sistolica");  
        set1.setAxisDependency(YAxis.AxisDependency.LEFT);
        set1.setColor(Color.RED);                  
        set1.setLineWidth(8);                      
        set1.setDrawHighlightIndicators(true);
        set1.setDrawFilled(true);                  
        set1.setFillColor(Color.RED);             
        set1.setCubicIntensity(1.0f);
        set1.setValueTextSize(13f);     

        ArrayList<ILineDataSet> dataSets = new ArrayList<ILineDataSet>();
        dataSets.add(set1);


        ArrayList<Entry> values2 = new ArrayList<Entry>();
        for (int i = 0; i < count; i++) {
            values2.add(new Entry(fechas[i], y_diasto[i]));
        }
        LineDataSet set2 = new LineDataSet(values2, "Diastolica");  //values2
        set2.setAxisDependency(YAxis.AxisDependency.LEFT);
        set2.setDrawFilled(true);
        set2.setColor(Color.BLUE);
        set2.setLineWidth(8);
        set2.setCubicIntensity(1.0f);
        set2.setValueTextSize(13f);     
        set2.setValueTextColor(Color.BLUE);  

        ArrayList<ILineDataSet> dataSets2 = new ArrayList<ILineDataSet>();
        dataSets2.add(set2);

        LineData lineData = new LineData();
        lineData.addDataSet(set1);
        lineData.addDataSet(set2);

        XAxis xAxis = lineChart.getXAxis();
        lineChart.setExtraBottomOffset(20);
        xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
        xAxis.setTextSize(12f);                        
        //xAxis.setTextColor(Color.BLUE);
        xAxis.setAxisMaximum(10f);     
        xAxis.setAxisMinimum(0f);

        lineChart.setData(lineData);
        lineChart.setScaleEnabled(true);
        lineChart.setDrawGridBackground(false);
        lineChart.setHighlightPerDragEnabled(true);
        lineChart.setDragEnabled(true);
        lineChart.invalidate();
    }