How to set on the xaxis of a timeline to only take into account days without caring about years.

[nestorcamposgestal]

Hi, I am using the timeline chart to represent series of tasks in different years. The thing is that on the xaxis, I want only to represent the days, and on the yaxis, I want to represent YEAR-MONTH. The problem is that although I set the format of the xaxis to only days, it shows me the days along all the years, and I only want to represent from the day 1 to day 31 because I am taking into account the years in the yaxis.

I attach you here a image of what I want:

And this is what I get:

As you can see, on the xaxis it goes from day 1 of 2029 to the day 1 of 2032 and I want to go only from day 1 to day 31 without taking into account the year.

Here is how I put the information in the series for the x and y values:

 observation.data.push({
            x:date1.getFullYear()+"-"+(date1.getMonth()+1),
            y:[
                date1.getTime(),
                date2.getTime(),
            ],
            proposalid: proposalid,
            starttime: date1.toString(),
            endtime: date2.toString()
        });

And here is the configuration of my chart:

let options={
        series: [],
        chart: {
          height: 1000,
          type: "rangeBar",
        },
        plotOptions: {
          bar: {
            horizontal: true,
            barHeight: "50%",
            rangeBarGroupRows: true,
          },
        },
        fill: {
          type: "solid",
        },
        xaxis: {
          type: "datetime",
          labels:{
            format: 'dd',  
          }
        },
        legend: {
          position: "right",
        },
      }

I would appreciate a lot if you can help me!