Formatting timezone of Google Charts datetime axis labels

Question

I\'m using GoogleCharts to draw a line chart with a \'datetime\' type along one axis. I\'d like to format the axis labels so that they display times in a specified timezone

Answer 1

use the hAxis.ticks configuration option to provide the axis labels

once the data has been formatted with DateFormat

build an array with the labels to be displayed

use object notation to provide the value (v:) and formatted value (f:) for each label

// Set X-Axis Labels
var xTicks = [];
for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
  xTicks.push({
    v: dataTable.getValue(i, 0),
    f: dataTable.getFormattedValue(i, 0)
  });
}

if you don't necessarily need to format the entire dataTable,
or you want to use labels that don't exist in the dataTable,
use the formatValue method on DateFormat

// Set X-Axis Labels
var xTicks = [];
for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
  xTicks.push({
    v: dataTable.getValue(i, 0),
    f: dateFormat.formatValue(dataTable.getValue(i, 0))
  });      
}

/*** OR ***/      

// custom date, not in dataTable
var customDate = new Date(2016, 9, 4, 22, 7, 7);
xTicks.push({
  v: customDate,  
  f: dateFormat.formatValue(customDate)
});

see following working snippet...

google.charts.load('current', {
  callback: function () {
    var dataTable = new google.visualization.DataTable();
    dataTable.addColumn('datetime', 'Time');
    dataTable.addColumn('number', 'Wolves');
    dataTable.addRows([
      [new Date(2020, 1, 1, 12), 1],
      [new Date(2020, 1, 1, 13), 3]
    ]);

    // Create DateFormat with a timezone offset of -4
    var dateFormat = new google.visualization.DateFormat({formatType: 'long', timeZone: -4});

    // Format the first column
    dateFormat.format(dataTable, 0);

    // Set X-Axis Labels
    var xTicks = [];
    for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
      xTicks.push({
        v: dataTable.getValue(i, 0),
        f: dataTable.getFormattedValue(i, 0)
      });
    }

    var table = new google.visualization.Table(document.getElementById('table_div'));
    table.draw(dataTable);

    var lineChart = new google.visualization.LineChart(document.getElementById('chart_div'));
    lineChart.draw(dataTable, {
      hAxis: {
        ticks: xTicks
      }
    });
  },
  packages:['corechart', 'table']
});

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="table_div"></div>
<div id="chart_div"></div>