Controlling tick marks and lines in chart.js time scatter plot

Concerning this jsfiddle which uses chartjs v3.9.1 and the date-fns adapter:

https://jsfiddle.net/0a6c1ty5/22/

1. I’m trying to format the tick labels in the function tick_label but I’m only getting a string as input. Is there a way to get the full Date object so I can include the month and day-of-month in the tick label if I want?

2. Is there a way to specify which times to use for tick lines along the time axis?

Here is the code from the fiddle:

var chart1

function tick_label(xvalue) {
    console.log("xvalue:", xvalue, "type:", typeof(xvalue))
    return xvalue
}

function doit() {
  let t0 = 1742662800*1000; // Sat Mar 22 12:00:00 CDT 2025
  let N = 31
  data = [...Array(N)].map((a,i) =>
               ({ 'x': new Date(i*3600000+t0),
                 'y': ~~(Math.random()*40)
               }))  
  config = {
    type: "scatter",
    data: { datasets: [{ label: "Random Values", data: data }] },
    options: {
      scales: {
        x: { type: 'time', ticks: { callback: tick_label, color: 'red' } }
      }
    }
  }
  chart1 = new Chart(document.getElementById('chart1'), config);
}
doit()