Question

Here’s a newbie question, but how do I use dates for the x-axis in a Google Charts line chart?

When I use new Date( … ) I get the error message “Uncaught Error: Date and datetime column types are not supported”

      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
['Datum','Person1','Person2','Person3'],
[new Date(2012, 12, 19, 0, 0, 0),'5072.0537223002','5072.0537223002','5074.2809630567'],
[new Date(2012, 12, 20, 0, 0, 0),'5072.0537223002','5072.0537223002','5074.2809630567'],
]);

        var options = {};

        var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }

(Using strings evenly spaces across the x-axis would be acceptable, but when I try with strings “Data column(s) for axis #0 cannot be of type string”)

Answer 1

What about to convert the date to a string and just use Date without new like below :

      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = google.visualization.arrayToDataTable([
['Datum','Person1','Person2','Person3'],
[Date(2012, 12, 19, 0, 0, 0).toString(),'5072.0537223002','5072.0537223002','5074.2809630567'],
[Date(2012, 12, 20, 0, 0, 0).toString(),'5072.0537223002','5072.0537223002','5074.2809630567'],
]);

        var options = {};

        var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }

Edit:
You can follow their example in this link :

https://google-developers.appspot.com/chart/interactive/docs/customizing_axes

Edit 2:

This is what I was able to do:
http://jsfiddle.net/ANC9H/2/

    google.load("visualization", "1", {packages:["LineChart"]});
    google.setOnLoadCallback(drawChart);
    function drawChart() {
    var data = new google.visualization.DataTable();
        data.addColumn('date', 'Date');
        data.addColumn('number', 'persone1');
        data.addColumn('number', 'persone2');
        data.addColumn('number', 'persone3');
        data.addRows([
                       [new Date(2008, 1 ,1),0.7,0.8,0.6],
                       [new Date(2008, 1 ,7),0.5,0.55,0.9] ]);
    var options = {};

    var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);
    }

I hope this helps.