diff --git a/samples/Chart/33_Chart_create_line_dateaxis.php b/samples/Chart/33_Chart_create_line_dateaxis.php
new file mode 100644
index 00000000..1a47e5aa
--- /dev/null
+++ b/samples/Chart/33_Chart_create_line_dateaxis.php
@@ -0,0 +1,375 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Chart;
+
+use DateTime;
+use PhpOffice\PhpSpreadsheet\Chart\Legend as ChartLegend;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Shared\Date as SharedDate;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+
+require __DIR__ . '/../Header.php';
+
+$spreadsheet = new Spreadsheet();
+$dataSheet = $spreadsheet->getActiveSheet();
+$dataSheet->setTitle('Data');
+// changed data to simulate a trend chart - Xaxis are dates; Yaxis are 3 meausurements from each date
+// Dates changed not to fall on exact quarter start
+$dataSheet->fromArray(
+    [
+        ['', 'date', 'metric1', 'metric2', 'metric3'],
+        ['=DATEVALUE(B2)', '2021-01-10', 12.1, 15.1, 21.1],
+        ['=DATEVALUE(B3)', '2021-04-21', 56.2, 73.2, 86.2],
+        ['=DATEVALUE(B4)', '2021-07-31', 52.2, 61.2, 69.2],
+        ['=DATEVALUE(B5)', '2021-10-11', 30.2, 22.2, 0.2],
+        ['=DATEVALUE(B6)', '2022-01-21', 40.1, 38.1, 65.1],
+        ['=DATEVALUE(B7)', '2022-04-11', 45.2, 44.2, 96.2],
+        ['=DATEVALUE(B8)', '2022-07-01', 52.2, 51.2, 55.2],
+        ['=DATEVALUE(B9)', '2022-10-31', 41.2, 72.2, 56.2],
+    ]
+);
+
+$dataSheet->getStyle('A2:A9')->getNumberFormat()->setFormatCode(Properties::FORMAT_CODE_DATE_ISO8601);
+$dataSheet->getColumnDimension('A')->setAutoSize(true);
+$dataSheet->getColumnDimension('B')->setAutoSize(true);
+$dataSheet->setSelectedCells('A1');
+
+// Set the Labels for each data series we want to plot
+//     Datatype
+//     Cell reference for data
+//     Format Code
+//     Number of datapoints in series
+$dataSeriesLabels = [
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_STRING, 'Data!$C$1', null, 1),
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_STRING, 'Data!$D$1', null, 1),
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_STRING, 'Data!$E$1', null, 1),
+];
+// Set the X-Axis Labels
+// NUMBER, not STRING
+// added x-axis values for each of the 3 metrics
+// added FORMATE_CODE_NUMBER
+// Number of datapoints in series
+$xAxisTickValues = [
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_NUMBER, 'Data!$A$2:$A$9', Properties::FORMAT_CODE_DATE_ISO8601, 8),
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_NUMBER, 'Data!$A$2:$A$9', Properties::FORMAT_CODE_DATE_ISO8601, 8),
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_NUMBER, 'Data!$A$2:$A$9', Properties::FORMAT_CODE_DATE_ISO8601, 8),
+];
+// Set the Data values for each data series we want to plot
+//     Datatype
+//     Cell reference for data
+//     Format Code
+//     Number of datapoints in series
+//     Data values
+//     Data Marker
+//     Data Marker Color fill/[fill,Border]
+//     Data Marker size
+//   Color(s) added
+// added FORMAT_CODE_NUMBER
+$dataSeriesValues = [
+    new DataSeriesValues(
+        DataSeriesValues::DATASERIES_TYPE_NUMBER,
+        'Data!$C$2:$C$9',
+        Properties::FORMAT_CODE_NUMBER,
+        8,
+        null,
+        'diamond',
+        null,
+        5
+    ),
+    new DataSeriesValues(
+        DataSeriesValues::DATASERIES_TYPE_NUMBER,
+        'Data!$D$2:$D$9',
+        Properties::FORMAT_CODE_NUMBER,
+        8,
+        null,
+        'square',
+        '*accent1',
+        6
+    ),
+    new DataSeriesValues(
+        DataSeriesValues::DATASERIES_TYPE_NUMBER,
+        'Data!$E$2:$E$9',
+        Properties::FORMAT_CODE_NUMBER,
+        8,
+        null,
+        null,
+        null,
+        7
+    ), // let Excel choose marker shape
+];
+// series 1 - metric1
+// marker details
+$dataSeriesValues[0]
+    ->getMarkerFillColor()
+    ->setColorProperties('0070C0', null, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+$dataSeriesValues[0]
+    ->getMarkerBorderColor()
+    ->setColorProperties('002060', null, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+
+// line details - dashed, smooth line (Bezier) with arrows, 40% transparent
+$dataSeriesValues[0]
+    ->setSmoothLine(true)
+    ->setScatterLines(true)
+    ->setLineColorProperties('accent1', 40, ChartColor::EXCEL_COLOR_TYPE_SCHEME); // value, alpha, type
+$dataSeriesValues[0]->setLineStyleProperties(
+    2.5, // width in points
+    Properties::LINE_STYLE_COMPOUND_TRIPLE, // compound
+    Properties::LINE_STYLE_DASH_SQUARE_DOT, // dash
+    Properties::LINE_STYLE_CAP_SQUARE, // cap
+    Properties::LINE_STYLE_JOIN_MITER, // join
+    Properties::LINE_STYLE_ARROW_TYPE_OPEN, // head type
+    Properties::LINE_STYLE_ARROW_SIZE_4, // head size preset index
+    Properties::LINE_STYLE_ARROW_TYPE_ARROW, // end type
+    Properties::LINE_STYLE_ARROW_SIZE_6 // end size preset index
+);
+
+// series 2 - metric2, straight line - no special effects, connected
+$dataSeriesValues[1] // square marker border color
+    ->getMarkerBorderColor()
+    ->setColorProperties('accent6', 3, ChartColor::EXCEL_COLOR_TYPE_SCHEME);
+$dataSeriesValues[1] // square marker fill color
+    ->getMarkerFillColor()
+    ->setColorProperties('0FFF00', null, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+$dataSeriesValues[1]
+    ->setScatterLines(true)
+    ->setSmoothLine(false)
+    ->setLineColorProperties('FF0000', 80, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+$dataSeriesValues[1]->setLineWidth(2.0);
+
+// series 3 - metric3, markers, no line
+$dataSeriesValues[2] // triangle? fill
+    //->setPointMarker('triangle') // let Excel choose shape, which is predicted to be a triangle
+    ->getMarkerFillColor()
+    ->setColorProperties('FFFF00', null, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+$dataSeriesValues[2] // triangle border
+    ->getMarkerBorderColor()
+    ->setColorProperties('accent4', null, ChartColor::EXCEL_COLOR_TYPE_SCHEME);
+$dataSeriesValues[2]->setScatterLines(false); // points not connected
+// Added so that Xaxis shows dates instead of Excel-equivalent-year1900-numbers
+$xAxis = new Axis();
+$xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE_ISO8601);
+
+// Build the dataseries
+$series = new DataSeries(
+    DataSeries::TYPE_SCATTERCHART, // plotType
+    null, // plotGrouping (Scatter charts don't have grouping)
+    range(0, count($dataSeriesValues) - 1), // plotOrder
+    $dataSeriesLabels, // plotLabel
+    $xAxisTickValues, // plotCategory
+    $dataSeriesValues, // plotValues
+    null, // plotDirection
+    null, // smooth line
+    DataSeries::STYLE_SMOOTHMARKER // plotStyle
+);
+
+// Set the series in the plot area
+$plotArea = new PlotArea(null, [$series]);
+// Set the chart legend
+$legend = new ChartLegend(ChartLegend::POSITION_TOPRIGHT, null, false);
+
+$title = new Title('Test Scatter Chart');
+$yAxisLabel = new Title('Value ($k)');
+$yAxis = new Axis();
+$yAxis->setMajorGridlines(new GridLines());
+
+// Create the chart
+$chart = new Chart(
+    'chart1', // name
+    $title, // title
+    $legend, // legend
+    $plotArea, // plotArea
+    true, // plotVisibleOnly
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
+    null, // xAxisLabel
+    $yAxisLabel,  // yAxisLabel
+    // added xAxis for correct date display
+    $xAxis, // xAxis
+    $yAxis, // yAxis
+);
+
+// Set the position of the chart in the chart sheet
+$chart->setTopLeftPosition('A1');
+$chart->setBottomRightPosition('P12');
+
+// create a 'Chart' worksheet, add $chart to it
+$spreadsheet->createSheet();
+$chartSheet = $spreadsheet->getSheet(1);
+$chartSheet->setTitle('Scatter+Line Chart');
+
+$chartSheet = $spreadsheet->getSheetByName('Scatter+Line Chart');
+// Add the chart to the worksheet
+$chartSheet->addChart($chart);
+
+// ------- Demonstrate Date Xaxis in Line Chart, not possible using Scatter Chart ------------
+
+// Set the Labels (Column header) for each data series we want to plot
+$dataSeriesLabels = [
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_STRING, 'Data!$E$1', null, 1),
+];
+
+// Set the X-Axis Labels - dates, N.B. 01/10/2021 === Jan 10, NOT Oct 1 !!
+// x-axis values are the Excel numeric representation of the date - so set
+// formatCode=General for the xAxis VALUES, but we want the labels to be
+// DISPLAYED as 'yyyy-mm-dd'  That is, read a number, display a date.
+$xAxisTickValues = [
+    new DataSeriesValues(DataSeriesValues::DATASERIES_TYPE_NUMBER, 'Data!$A$2:$A$9', Properties::FORMAT_CODE_DATE_ISO8601, 8),
+];
+
+// X axis (date) settings
+$xAxisLabel = new Title('Date');
+$xAxis = new Axis();
+$xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE_ISO8601); // yyyy-mm-dd
+
+// Set the Data values for each data series we want to plot
+$dataSeriesValues = [
+    new DataSeriesValues(
+        DataSeriesValues::DATASERIES_TYPE_NUMBER,
+        'Data!$E$2:$E$9',
+        Properties::FORMAT_CODE_NUMBER,
+        8,
+        null,
+        'triangle',
+        null,
+        7
+    ),
+];
+
+// series - metric3, markers, no line
+$dataSeriesValues[0]
+    ->setScatterlines(false); // disable connecting lines
+$dataSeriesValues[0]
+    ->getMarkerFillColor()
+    ->setColorProperties('FFFF00', null, ChartColor::EXCEL_COLOR_TYPE_ARGB);
+$dataSeriesValues[0]
+    ->getMarkerBorderColor()
+    ->setColorProperties('accent4', null, ChartColor::EXCEL_COLOR_TYPE_SCHEME);
+
+// Build the dataseries
+// must now use LineChart instead of ScatterChart, since ScatterChart does not
+// support "dateAx" axis type.
+$series = new DataSeries(
+    DataSeries::TYPE_LINECHART, // plotType
+    'standard', // plotGrouping
+    range(0, count($dataSeriesValues) - 1), // plotOrder
+    $dataSeriesLabels, // plotLabel
+    $xAxisTickValues, // plotCategory
+    $dataSeriesValues, // plotValues
+    null, // plotDirection
+    false, // smooth line
+    DataSeries::STYLE_LINEMARKER  // plotStyle
+    // DataSeries::STYLE_SMOOTHMARKER // plotStyle
+);
+
+// Set the series in the plot area
+$plotArea = new PlotArea(null, [$series]);
+// Set the chart legend
+$legend = new ChartLegend(ChartLegend::POSITION_RIGHT, null, false);
+
+$title = new Title('Test Line-Chart with Date Axis - metric3 values');
+
+// X axis (date) settings
+$xAxisLabel = new Title('Game Date');
+$xAxis = new Axis();
+// date axis values are Excel numbers, not yyyy-mm-dd Date strings
+$xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE_ISO8601);
+
+$xAxis->setAxisType('dateAx'); // dateAx available ONLY for LINECHART, not SCATTERCHART
+
+// measure the time span in Quarters, of data.
+$dateMinMax = dateRange(8, $spreadsheet); // array 'min'=>earliest date of first Q, 'max'=>latest date of final Q
+// change xAxis tick marks to match Qtr boundaries
+
+$nQtrs = sprintf('%3.2f', (($dateMinMax['max'] - $dateMinMax['min']) / 30.5) / 4);
+$tickMarkInterval = ($nQtrs > 20) ? 6 : 3; // tick marks every ? months
+
+$xAxis->setAxisOptionsProperties(
+    Properties::AXIS_LABELS_NEXT_TO, // axis_label pos
+    null, // horizontalCrossesValue
+    null, // horizontalCrosses
+    null, // axisOrientation
+    'in', // major_tick_mark
+    null, // minor_tick_mark
+    $dateMinMax['min'], // minimum calculate this from the earliest data: 'Data!$A$2'
+    $dateMinMax['max'], // maximum calculate this from the last data:     'Data!$A$'.($nrows+1)
+    $tickMarkInterval,  // majorUnit determines tickmarks & Gridlines ?
+    null, // minorUnit
+    null, // textRotation
+    null, // hidden
+    'days', // baseTimeUnit
+    'months', // majorTimeUnit,
+    'months',   // minorTimeUnit
+);
+
+$yAxisLabel = new Title('Value ($k)');
+$yAxis = new Axis();
+$yAxis->setMajorGridlines(new GridLines());
+$xAxis->setMajorGridlines(new GridLines());
+$minorGridLines = new GridLines();
+$minorGridLines->activateObject();
+$xAxis->setMinorGridlines($minorGridLines);
+
+// Create the chart
+$chart = new Chart(
+    'chart2', // name
+    $title, // title
+    $legend, // legend
+    $plotArea, // plotArea
+    true, // plotVisibleOnly
+    DataSeries::EMPTY_AS_GAP, // displayBlanksAs
+    null, // xAxisLabel
+    $yAxisLabel,  // yAxisLabel
+    // added xAxis for correct date display
+    $xAxis, // xAxis
+    $yAxis, // yAxis
+);
+
+// Set the position of the chart in the chart sheet below the first chart
+$chart->setTopLeftPosition('A13');
+$chart->setBottomRightPosition('P25');
+$chart->setRoundedCorners('true'); // Rounded corners in Chart Outline
+
+// Add the chart to the worksheet $chartSheet
+$chartSheet->addChart($chart);
+$spreadsheet->setActiveSheetIndex(1);
+
+// Save Excel 2007 file
+$filename = $helper->getFilename(__FILE__);
+$writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
+$writer->setIncludeCharts(true);
+$callStartTime = microtime(true);
+$writer->save($filename);
+$helper->logWrite($writer, $filename, $callStartTime);
+$spreadsheet->disconnectWorksheets();
+
+function dateRange(int $nrows, Spreadsheet $wrkbk): array
+{
+    $dataSheet = $wrkbk->getSheetByName('Data');
+
+    // start the xaxis at the beginning of the quarter of the first date
+    $startDateStr = $dataSheet->getCell('B2')->getValue(); // yyyy-mm-dd date string
+    $startDate = DateTime::createFromFormat('Y-m-d', $startDateStr); // php date obj
+
+    // get date of first day of the quarter of the start date
+    $startMonth = $startDate->format('n'); // suppress leading zero
+    $startYr = $startDate->format('Y');
+    $qtr = intdiv($startMonth, 3) + (($startMonth % 3 > 0) ? 1 : 0);
+    $qtrStartMonth = sprintf('%02d', 1 + (($qtr - 1) * 3));
+    $qtrStartStr = "$startYr-$qtrStartMonth-01";
+    $ExcelQtrStartDateVal = SharedDate::convertIsoDate($qtrStartStr);
+
+    // end the xaxis at the end of the quarter of the last date
+    $lastDateStr = $dataSheet->getCellByColumnAndRow(2, $nrows + 1)->getValue();
+    $lastDate = DateTime::createFromFormat('Y-m-d', $lastDateStr);
+    $lastMonth = $lastDate->format('n');
+    $lastYr = $lastDate->format('Y');
+    $qtr = intdiv($lastMonth, 3) + (($lastMonth % 3 > 0) ? 1 : 0);
+    $qtrEndMonth = 3 + (($qtr - 1) * 3);
+    $lastDOM = cal_days_in_month(CAL_GREGORIAN, $qtrEndMonth, $lastYr);
+    $qtrEndMonth = sprintf('%02d', $qtrEndMonth);
+    $qtrEndStr = "$lastYr-$qtrEndMonth-$lastDOM";
+    $ExcelQtrEndDateVal = SharedDate::convertIsoDate($qtrEndStr);
+
+    $minMaxDates = ['min' => $ExcelQtrStartDateVal, 'max' => $ExcelQtrEndDateVal];
+
+    return $minMaxDates;
+}
diff --git a/samples/Chart/33_Chart_create_scatter5_trendlines.php b/samples/Chart/33_Chart_create_scatter5_trendlines.php
index da831fa9..a640f735 100644
--- a/samples/Chart/33_Chart_create_scatter5_trendlines.php
+++ b/samples/Chart/33_Chart_create_scatter5_trendlines.php
@@ -263,6 +263,7 @@ $chart->setBottomRightPosition('P25');
 
 // Add the chart to the worksheet $chartSheet
 $chartSheet->addChart($chart);
+$spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
 $filename = $helper->getFilename(__FILE__);
diff --git a/samples/templates/32readwriteLineDateAxisChart1.xlsx b/samples/templates/32readwriteLineDateAxisChart1.xlsx
new file mode 100644
index 00000000..42470303
Binary files /dev/null and b/samples/templates/32readwriteLineDateAxisChart1.xlsx differ
diff --git a/src/PhpSpreadsheet/Chart/Axis.php b/src/PhpSpreadsheet/Chart/Axis.php
index bd7082ff..3ac5c3cd 100644
--- a/src/PhpSpreadsheet/Chart/Axis.php
+++ b/src/PhpSpreadsheet/Chart/Axis.php
@@ -10,6 +10,14 @@ namespace PhpOffice\PhpSpreadsheet\Chart;
  */
 class Axis extends Properties
 {
+    const AXIS_TYPE_CATEGORY = 'catAx';
+    const AXIS_TYPE_DATE = 'dateAx';
+    const AXIS_TYPE_VALUE = 'valAx';
+
+    const TIME_UNIT_DAYS = 'days';
+    const TIME_UNIT_MONTHS = 'months';
+    const TIME_UNIT_YEARS = 'years';
+
     public function __construct()
     {
         parent::__construct();
@@ -62,6 +70,9 @@ class Axis extends Properties
         'horizontal_crosses_value' => null,
         'textRotation' => null,
         'hidden' => null,
+        'majorTimeUnit' => self::TIME_UNIT_YEARS,
+        'minorTimeUnit' => self::TIME_UNIT_MONTHS,
+        'baseTimeUnit' => self::TIME_UNIT_DAYS,
     ];
 
     /**
@@ -74,6 +85,7 @@ class Axis extends Properties
     private const NUMERIC_FORMAT = [
         Properties::FORMAT_CODE_NUMBER,
         Properties::FORMAT_CODE_DATE,
+        Properties::FORMAT_CODE_DATE_ISO8601,
     ];
 
     /**
@@ -115,12 +127,12 @@ class Axis extends Properties
 
     public function getAxisIsNumericFormat(): bool
     {
-        return (bool) $this->axisNumber['numeric'];
+        return $this->axisType === self::AXIS_TYPE_DATE || (bool) $this->axisNumber['numeric'];
     }
 
     public function setAxisOption(string $key, ?string $value): void
     {
-        if (!empty($value)) {
+        if ($value !== null && $value !== '') {
             $this->axisOptions[$key] = $value;
         }
     }
@@ -140,7 +152,10 @@ class Axis extends Properties
         ?string $majorUnit = null,
         ?string $minorUnit = null,
         ?string $textRotation = null,
-        ?string $hidden = null
+        ?string $hidden = null,
+        ?string $baseTimeUnit = null,
+        ?string $majorTimeUnit = null,
+        ?string $minorTimeUnit = null
     ): void {
         $this->axisOptions['axis_labels'] = $axisLabels;
         $this->setAxisOption('horizontal_crosses_value', $horizontalCrossesValue);
@@ -154,6 +169,9 @@ class Axis extends Properties
         $this->setAxisOption('minor_unit', $minorUnit);
         $this->setAxisOption('textRotation', $textRotation);
         $this->setAxisOption('hidden', $hidden);
+        $this->setAxisOption('baseTimeUnit', $baseTimeUnit);
+        $this->setAxisOption('majorTimeUnit', $majorTimeUnit);
+        $this->setAxisOption('minorTimeUnit', $minorTimeUnit);
     }
 
     /**
@@ -185,7 +203,7 @@ class Axis extends Properties
 
     public function setAxisType(string $type): self
     {
-        if ($type === 'catAx' || $type === 'valAx') {
+        if ($type === self::AXIS_TYPE_CATEGORY || $type === self::AXIS_TYPE_VALUE || $type === self::AXIS_TYPE_DATE) {
             $this->axisType = $type;
         } else {
             $this->axisType = '';
diff --git a/src/PhpSpreadsheet/Reader/Xlsx/Chart.php b/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
index dab2b410..76316db9 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx/Chart.php
@@ -139,12 +139,13 @@ class Chart
                                             $plotAreaLayout = $this->chartLayoutDetails($chartDetail);
 
                                             break;
-                                        case 'catAx':
+                                        case Axis::AXIS_TYPE_CATEGORY:
+                                        case Axis::AXIS_TYPE_DATE:
                                             $catAxRead = true;
                                             if (isset($chartDetail->title)) {
                                                 $XaxisLabel = $this->chartTitle($chartDetail->title->children($this->cNamespace));
                                             }
-                                            $xAxis->setAxisType('catAx');
+                                            $xAxis->setAxisType($chartDetailKey);
                                             $this->readEffects($chartDetail, $xAxis);
                                             if (isset($chartDetail->spPr)) {
                                                 $sppr = $chartDetail->spPr->children($this->aNamespace);
@@ -173,13 +174,7 @@ class Chart
                                             $this->setAxisProperties($chartDetail, $xAxis);
 
                                             break;
-                                        case 'dateAx':
-                                            if (isset($chartDetail->title)) {
-                                                $XaxisLabel = $this->chartTitle($chartDetail->title->children($this->cNamespace));
-                                            }
-
-                                            break;
-                                        case 'valAx':
+                                        case Axis::AXIS_TYPE_VALUE:
                                             $whichAxis = null;
                                             $axPos = null;
                                             if (isset($chartDetail->axPos)) {
@@ -1375,6 +1370,15 @@ class Chart
         if (isset($chartDetail->minorUnit)) {
             $whichAxis->setAxisOption('minor_unit', (string) self::getAttribute($chartDetail->minorUnit, 'val', 'string'));
         }
+        if (isset($chartDetail->baseTimeUnit)) {
+            $whichAxis->setAxisOption('baseTimeUnit', (string) self::getAttribute($chartDetail->baseTimeUnit, 'val', 'string'));
+        }
+        if (isset($chartDetail->majorTimeUnit)) {
+            $whichAxis->setAxisOption('majorTimeUnit', (string) self::getAttribute($chartDetail->majorTimeUnit, 'val', 'string'));
+        }
+        if (isset($chartDetail->minorTimeUnit)) {
+            $whichAxis->setAxisOption('minorTimeUnit', (string) self::getAttribute($chartDetail->minorTimeUnit, 'val', 'string'));
+        }
         if (isset($chartDetail->txPr)) {
             $children = $chartDetail->txPr->children($this->aNamespace);
             if (isset($children->bodyPr)) {
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
index ad746a0a..48f7d255 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
@@ -490,13 +490,14 @@ class Chart extends WriterPart
     private function writeCategoryAxis(XMLWriter $objWriter, ?Title $xAxisLabel, $id1, $id2, $isMultiLevelSeries, Axis $yAxis): void
     {
         // N.B. writeCategoryAxis may be invoked with the last parameter($yAxis) using $xAxis for ScatterChart, etc
-        // In that case, xAxis is NOT a category.
-        if ($yAxis->getAxisType() !== '') {
-            $objWriter->startElement('c:' . $yAxis->getAxisType());
+        // In that case, xAxis may contain values like the yAxis, or it may be a date axis (LINECHART).
+        $axisType = $yAxis->getAxisType();
+        if ($axisType !== '') {
+            $objWriter->startElement("c:$axisType");
         } elseif ($yAxis->getAxisIsNumericFormat()) {
-            $objWriter->startElement('c:valAx');
+            $objWriter->startElement('c:' . Axis::AXIS_TYPE_VALUE);
         } else {
-            $objWriter->startElement('c:catAx');
+            $objWriter->startElement('c:' . Axis::AXIS_TYPE_CATEGORY);
         }
         $majorGridlines = $yAxis->getMajorGridlines();
         $minorGridlines = $yAxis->getMinorGridlines();
@@ -654,7 +655,8 @@ class Chart extends WriterPart
         }
 
         $objWriter->startElement('c:auto');
-        $objWriter->writeAttribute('val', '1');
+        // LineChart with dateAx wants '0'
+        $objWriter->writeAttribute('val', ($axisType === Axis::AXIS_TYPE_DATE) ? '0' : '1');
         $objWriter->endElement();
 
         $objWriter->startElement('c:lblAlgn');
@@ -665,6 +667,30 @@ class Chart extends WriterPart
         $objWriter->writeAttribute('val', '100');
         $objWriter->endElement();
 
+        if ($axisType === Axis::AXIS_TYPE_DATE) {
+            $property = 'baseTimeUnit';
+            $propertyVal = $yAxis->getAxisOptionsProperty($property);
+            if (!empty($propertyVal)) {
+                $objWriter->startElement("c:$property");
+                $objWriter->writeAttribute('val', $propertyVal);
+                $objWriter->endElement();
+            }
+            $property = 'majorTimeUnit';
+            $propertyVal = $yAxis->getAxisOptionsProperty($property);
+            if (!empty($propertyVal)) {
+                $objWriter->startElement("c:$property");
+                $objWriter->writeAttribute('val', $propertyVal);
+                $objWriter->endElement();
+            }
+            $property = 'minorTimeUnit';
+            $propertyVal = $yAxis->getAxisOptionsProperty($property);
+            if (!empty($propertyVal)) {
+                $objWriter->startElement("c:$property");
+                $objWriter->writeAttribute('val', $propertyVal);
+                $objWriter->endElement();
+            }
+        }
+
         if ($isMultiLevelSeries) {
             $objWriter->startElement('c:noMultiLvlLbl');
             $objWriter->writeAttribute('val', '0');
@@ -683,7 +709,7 @@ class Chart extends WriterPart
      */
     private function writeValueAxis(XMLWriter $objWriter, ?Title $yAxisLabel, $groupType, $id1, $id2, $isMultiLevelSeries, Axis $xAxis): void
     {
-        $objWriter->startElement('c:valAx');
+        $objWriter->startElement('c:' . Axis::AXIS_TYPE_VALUE);
         $majorGridlines = $xAxis->getMajorGridlines();
         $minorGridlines = $xAxis->getMinorGridlines();
 
@@ -1079,7 +1105,7 @@ class Chart extends WriterPart
                         $objWriter->endElement(); // a:ln
                     }
                 }
-                $nofill = $groupType == DataSeries::TYPE_STOCKCHART || ($groupType === DataSeries::TYPE_SCATTERCHART && !$plotSeriesValues->getScatterLines());
+                $nofill = $groupType === DataSeries::TYPE_STOCKCHART || (($groupType === DataSeries::TYPE_SCATTERCHART || $groupType === DataSeries::TYPE_LINECHART) && !$plotSeriesValues->getScatterLines());
                 if ($callLineStyles) {
                     $this->writeLineStyles($objWriter, $plotSeriesValues, $nofill);
                     $this->writeEffects($objWriter, $plotSeriesValues);
diff --git a/tests/PhpSpreadsheetTests/Chart/AxisPropertiesTest.php b/tests/PhpSpreadsheetTests/Chart/AxisPropertiesTest.php
index 91df25cb..0bfc2966 100644
--- a/tests/PhpSpreadsheetTests/Chart/AxisPropertiesTest.php
+++ b/tests/PhpSpreadsheetTests/Chart/AxisPropertiesTest.php
@@ -109,7 +109,9 @@ class AxisPropertiesTest extends AbstractFunctional
             '8', //minimum
             '68', //maximum
             '20', //majorUnit
-            '5' //minorUnit
+            '5', //minorUnit
+            '6', //textRotation
+            '0', //hidden
         );
         self::assertSame(Properties::AXIS_LABELS_HIGH, $xAxis->getAxisOptionsProperty('axis_labels'));
         self::assertNull($xAxis->getAxisOptionsProperty('horizontal_crosses_value'));
@@ -121,6 +123,8 @@ class AxisPropertiesTest extends AbstractFunctional
         self::assertSame('68', $xAxis->getAxisOptionsProperty('maximum'));
         self::assertSame('20', $xAxis->getAxisOptionsProperty('major_unit'));
         self::assertSame('5', $xAxis->getAxisOptionsProperty('minor_unit'));
+        self::assertSame('6', $xAxis->getAxisOptionsProperty('textRotation'));
+        self::assertSame('0', $xAxis->getAxisOptionsProperty('hidden'));
 
         $yAxis = new Axis();
         $yAxis->setFillParameters('accent1', 30, 'schemeClr');
@@ -158,6 +162,8 @@ class AxisPropertiesTest extends AbstractFunctional
         self::assertSame('68', $xAxis2->getAxisOptionsProperty('maximum'));
         self::assertSame('20', $xAxis2->getAxisOptionsProperty('major_unit'));
         self::assertSame('5', $xAxis2->getAxisOptionsProperty('minor_unit'));
+        self::assertSame('6', $xAxis2->getAxisOptionsProperty('textRotation'));
+        self::assertSame('0', $xAxis2->getAxisOptionsProperty('hidden'));
 
         $yAxis2 = $chart->getChartAxisY();
         self::assertSame('accent1', $yAxis2->getFillProperty('value'));
@@ -198,6 +204,8 @@ class AxisPropertiesTest extends AbstractFunctional
         self::assertSame('68', $xAxis3->getAxisOptionsProperty('maximum'));
         self::assertSame('20', $xAxis3->getAxisOptionsProperty('major_unit'));
         self::assertSame('5', $xAxis3->getAxisOptionsProperty('minor_unit'));
+        self::assertSame('6', $xAxis3->getAxisOptionsProperty('textRotation'));
+        self::assertSame('0', $xAxis3->getAxisOptionsProperty('hidden'));
 
         $yAxis3 = $chart2->getChartAxisY();
         self::assertSame('accent1', $yAxis3->getFillProperty('value'));
diff --git a/tests/PhpSpreadsheetTests/Chart/Charts32CatAxValAxTest.php b/tests/PhpSpreadsheetTests/Chart/Charts32CatAxValAxTest.php
index 268ee094..1f046af9 100644
--- a/tests/PhpSpreadsheetTests/Chart/Charts32CatAxValAxTest.php
+++ b/tests/PhpSpreadsheetTests/Chart/Charts32CatAxValAxTest.php
@@ -23,6 +23,8 @@ class Charts32CatAxValAxTest extends TestCase
     /** @var string */
     private $outputFileName = '';
 
+    private const FORMAT_CODE_DATE_ISO8601_SLASH = 'yyyy/mm/dd'; // not automatically treated as numeric
+
     protected function tearDown(): void
     {
         if ($this->outputFileName !== '') {
@@ -48,7 +50,7 @@ class Charts32CatAxValAxTest extends TestCase
                 ['=DATEVALUE("2021-01-10")', 30.2, 32.2, 0.2],
             ]
         );
-        $worksheet->getStyle('A2:A5')->getNumberFormat()->setFormatCode(Properties::FORMAT_CODE_DATE_ISO8601);
+        $worksheet->getStyle('A2:A5')->getNumberFormat()->setFormatCode(self::FORMAT_CODE_DATE_ISO8601_SLASH);
         $worksheet->getColumnDimension('A')->setAutoSize(true);
         $worksheet->setSelectedCells('A1');
 
@@ -91,9 +93,9 @@ class Charts32CatAxValAxTest extends TestCase
         $xAxis = new Axis();
         //$xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE );
         if (is_bool($numeric)) {
-            $xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE_ISO8601, $numeric);
+            $xAxis->setAxisNumberProperties(self::FORMAT_CODE_DATE_ISO8601_SLASH, $numeric);
         } else {
-            $xAxis->setAxisNumberProperties(Properties::FORMAT_CODE_DATE_ISO8601);
+            $xAxis->setAxisNumberProperties(self::FORMAT_CODE_DATE_ISO8601_SLASH);
         }
 
         // Build the dataseries
diff --git a/tests/PhpSpreadsheetTests/Chart/Charts32XmlTest.php b/tests/PhpSpreadsheetTests/Chart/Charts32XmlTest.php
index 6a4673fd..4cc62360 100644
--- a/tests/PhpSpreadsheetTests/Chart/Charts32XmlTest.php
+++ b/tests/PhpSpreadsheetTests/Chart/Charts32XmlTest.php
@@ -177,4 +177,45 @@ class Charts32XmlTest extends TestCase
             )
         );
     }
+
+    public function testDateAx(): void
+    {
+        $file = self::DIRECTORY . '32readwriteLineDateAxisChart1.xlsx';
+        $reader = new XlsxReader();
+        $reader->setIncludeCharts(true);
+        $spreadsheet = $reader->load($file);
+        $sheet = $spreadsheet->getActiveSheet();
+        $charts = $sheet->getChartCollection();
+        self::assertCount(2, $charts);
+        $chart = $charts[1];
+        self::assertNotNull($chart);
+
+        $writer = new XlsxWriter($spreadsheet);
+        $writer->setIncludeCharts(true);
+        $writerChart = new XlsxWriter\Chart($writer);
+        $data = $writerChart->writeChart($chart);
+        $spreadsheet->disconnectWorksheets();
+
+        self::assertSame(
+            1,
+            substr_count(
+                $data,
+                '<c:baseTimeUnit val="days"/><c:majorTimeUnit val="months"/><c:minorTimeUnit val="months"/>'
+            )
+        );
+        self::assertSame(
+            1,
+            substr_count(
+                $data,
+                '<c:dateAx>'
+            )
+        );
+        self::assertSame(
+            1,
+            substr_count(
+                $data,
+                '<c:valAx>'
+            )
+        );
+    }
 }