DateTimeAutomatic Tick Formatters

ScottPlot.Plot myPlot = new();

// plot data using DateTime values on the horizontal axis
DateTime[] xs = Generate.ConsecutiveHours(100);
double[] ys = Generate.RandomWalk(100);
myPlot.Add.Scatter(xs, ys);

// setup the bottom axis to use DateTime ticks
var axis = myPlot.Axes.DateTimeTicksBottom();

// create a custom formatter to return a string with
// date only when zoomed out and time only when zoomed in
static string CustomFormatter(DateTime dt)
{
    bool isMidnight = dt is { Hour: 0, Minute: 0, Second: 0 };
    return isMidnight
        ? DateOnly.FromDateTime(dt).ToString()
        : TimeOnly.FromDateTime(dt).ToString();
}

// apply our custom tick formatter
var tickGen = (ScottPlot.TickGenerators.DateTimeAutomatic)axis.TickGenerator;
tickGen.LabelFormatter = CustomFormatter;

myPlot.SavePng("demo.png", 400, 300);