Line Chart, How do I select two points and grab dates

[tez]

I am charting historical Stock Exchange Data and I want to know how to select two points, so I can store them in form inputs as a Start Date and End Date to use in my code for another API. 

I have

function drawChart(chartData, data) {

google.charts.load('current', { 'packages': ['line'] });

google.charts.setOnLoadCallback(drawChart);

function drawChart() {

var data = new google.visualization.DataTable();

data.addColumn('date', 'Date');

data.addColumn('number', `${addCompanyName} Closing Price`);

for (var x = 0; x < chartData.length; x++) {

const chartDate = (chartData[x].date);

const chartClose = (chartData[x].close)

data.addRows([

[new Date(chartDate), chartClose],

]);

}

var options = {

selectionMode: 'multiple',

chart: {

title: `${addCompanyName}`,

subtitle: '5 years Growth'

},

width: 900,

height: 500,

axes: {

x: {

0: { side: 'top' }

}

}

};

var chart = new google.charts.Line(document.getElementById('line_top_x'));

chart.draw(data, google.charts.Line.convertOptions(options));

}

}

So far I have Selection mode set to multiple, Is there any way I can limit that Selection to 2? And how can I grab the date to use for later?  Thanks for an advance to anyone reading this, any help would be greatly appreciated!

[tez]

So I successfully created an event listener

var chart = new google.charts.Line(document.getElementById('line_top_x'));

chart.draw(data, google.charts.Line.convertOptions(options));

google.visualization.events.addListener(chart, 'select', selectHandler);

function selectHandler() {

alert('A chart row was selected');

}

Now I am figuring out how to select specifically chartData[x].date
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