javascript - Customizing tooltip on Google Timeline Chart -

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i created google timeline chart see musical listening history. looks this:

enter image description here

i want remove duration part tooltip, couldn't find option it. tried adding these lines:

datatable.addcolumn({type: 'string', role:'tooltip'});

and row in datatable.addrows([]) function looks this:

['25 august', 'kasabian - la fee verte', new date(2016,01,01, 13,37,32), new date(2016,01,01, 13,43,19), 'tooltip example'],

but still shows same tooltip in image. want show kasabian - la fee verte , 25 august: 1:37 pm - 1:43 pm in image, want remove duration.

according data format timeline chart, tooltip should in 3rd column.

see following, working snippet... 

google.charts.load('current', {    callback: function () {      var container = document.getelementbyid('chart_div');      var chart = new google.visualization.timeline(container);        var datatable = new google.visualization.datatable();      datatable.addcolumn({type: 'string', id: 'rowlabel'});      datatable.addcolumn({type: 'string', id: 'barlabel'});      datatable.addcolumn({type: 'date', id: 'start'});      datatable.addcolumn({type: 'date', id: 'end'});        datatable.addrows([        ['25 august', 'kasabian - la fee verte', new date(2016,01,01, 13,37,32), new date(2016,01,01, 13,43,19)],        ['26 august', 'test data 1', new date(2016,01,01, 13,37,32), new date(2016,01,01, 13,43,19)],        ['27 august', 'test data 2', new date(2016,01,01, 13,37,32), new date(2016,01,01, 13,43,19)],      ]);        datatable.insertcolumn(2, {type: 'string', role: 'tooltip', p: {html: true}});        var dateformat = new google.visualization.dateformat({        pattern: 'h:mm a'      });        (var = 0; < datatable.getnumberofrows(); i++) {        var tooltip = '<div class="ggl-tooltip"><span>' +          datatable.getvalue(i, 1) + '</span></div><div class="ggl-tooltip"><span>' +          datatable.getvalue(i, 0) + '</span>: ' +          dateformat.formatvalue(datatable.getvalue(i, 3)) + ' - ' +          dateformat.formatvalue(datatable.getvalue(i, 4)) + '</div>';          datatable.setvalue(i, 2, tooltip);      }        chart.draw(datatable, {        tooltip: {          ishtml: true        }      });    },    packages: ['timeline']  });
.ggl-tooltip {    border: 1px solid #e0e0e0;    font-family: arial, helvetica;    padding: 6px 6px 6px 6px;  }    .ggl-tooltip span {    font-weight: bold;  }
<script src="https://www.gstatic.com/charts/loader.js"></script>  <div id="chart_div"></div>


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