Date Axis group data property

[pratham3164]

I am working on DateAxis and I have a huge data set to render in the chart. So I tried to group data it renders fewer records but it seems to render the last record in the group. Is it by design or I can change it to show other records as well like the first one in the group?

codepen for reference: https://codepen.io/ErPratham/pen/oNrzvGB

[martynasma]

It uses the value of the last data item in the group by default.

You can change it: https://www.amcharts.com/docs/v5/charts/xy-chart/axes/date-axis/#aggregation-function

[pratham3164]

@martynasma even after using aggregation function. The datetime in the group is of the last data item . is it possible to show the datetime of the first or aggregated value in case of max min .

[zeroin]

Yes, the time is of the last grouped value. axis tooltip will show correct date:
https://codepen.io/team/amcharts/pen/gONwVXa

If you need correct date to be shown in tooltip, you will need to create adapter for labelText of a tooltip. This adapter should check what is current base interval and round or format date in a way you want, something like:

  tooltip.adapters.add("labelText", (labelText)=>{
    var baseInterval = xAxis0.getPrivate("baseInterval")
    
    if(baseInterval.timeUnit == "day"){
      // round or format date 
    }
    else if(baseInterval == "hour"){
      
    }
    
    return labelText
  })

By the way you have some incorrect setup - baseInterval should be minute, not hour:

[pratham3164]

the solution seems to work only for the series 0 and series 2 stills shows the same

tooltip.adapters.add("labelText", (labelText)=>{
  var baseInterval = xAxis0.getPrivate("baseInterval")
  if(baseInterval.timeUnit == "day"){
    labelText = "{name}:{date.formatDate('yyyy-MM-dd 00:00')} : {valueY}";
  }
  else if(baseInterval == "hour"){
  }
  return labelText
})

and how to get the timestamp of the first record to show up

[zeroin]

Did you add the same tooltip and adapter for the second series? It should be a different instance of a tooltip.

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