C#: command line calendar

This is a C# version of the PHP command line calendar. The program prints the days of the current month and highlights the current day. It was developed against .NET 7, which allows top-level statements - that's why the familiar boiler plate code is missing.

int colWidth = 4; // can be changed but don't make less than 2

// Print month and year
Console.WriteLine(DateTime.Today.ToString("MMMM yyyy"));

// Print days of the week header (Mo to Su)
Console.WriteLine("Mo{0}Tu{0}We{0}Th{0}Fr{0}Sa{0}Su{0}", string.Concat(Enumerable.Repeat(" ", colWidth - 2)));

// Values for today's date
var currentDay = DateTime.Today.Day;
var currentMonth = DateTime.Today.Month;
var currentYear = DateTime.Today.Year;

// Number of days in the month
var numDays = DateTime.DaysInMonth(currentYear, currentMonth);

// Loop through all days in the month
for (int day = 1; day <= numDays; day++)
{
    int dayOfWeek = (int)new DateTime(currentYear, currentMonth, day).DayOfWeek; // 0 (Sunday) - 6 (Saturday)
    dayOfWeek = dayOfWeek == 0 ? 7 : dayOfWeek; // use 7 for Sunday instead of 0

    if (day == 1)
    {
        // Print any leading spaces required for the first day of the month
        var spaces = (dayOfWeek - 1) * colWidth;
        Console.Write(string.Concat(Enumerable.Repeat(" ", spaces)));
    }

    // Highlight the current day
    if (day == currentDay)
        Console.ForegroundColor = ConsoleColor.Green;

    // Print the current day number plus required padding
    Console.Write(day + (day < 10 ? " " : "") + string.Concat(Enumerable.Repeat(" ", colWidth - 2)));

    // Reset text color
    if (day == currentDay)
        Console.ResetColor();

    // Start a new line after each Sunday
    if (dayOfWeek == 7)
        Console.WriteLine();
}

Sample output:

October 2023
Mo  Tu  We  Th  Fr  Sa  Su
                        1
2   3   4   5   6   7   8
9   10  11  12  13  14  15
16  17  18  19  20  21  22
23  24  25  26  27  28  29
30  31