// OpenSCAD doesn't have built-in time functions, so we'll use system commands
// and string manipulation to work with time.

// Function to get the current time as a string
function current_time() = 
    str(floor(system("date +%s") / 3600), ":",
        floor((system("date +%s") % 3600) / 60), ":",
        system("date +%s") % 60);

// Function to create a simple date
function create_date(year, month, day) = 
    str(year, "-", month < 10 ? str("0", month) : month, "-", day < 10 ? str("0", day) : day);

// Main part of the script
echo("Current time:", current_time());

echo("Created date:", create_date(2009, 11, 17));

// OpenSCAD doesn't have built-in weekday calculation,
// so we'll just print a placeholder
echo("Weekday: Not available in OpenSCAD");

// Time comparison is not directly possible in OpenSCAD,
// but we can compare date strings
echo("Date comparison:", create_date(2009, 11, 17) < create_date(2023, 5, 24));

// Duration calculation is not available in OpenSCAD

// We can perform simple date arithmetic by manipulating strings
function add_days(date, days) =
    let(parts = split(date, "-"))
    create_date(parts[0] + floor((parts[2] + days) / 365), 
                ((parts[1] - 1 + floor((parts[2] + days) % 365) / 30) % 12) + 1, 
                ((parts[2] - 1 + days) % 30) + 1);

echo("Date after adding 100 days:", add_days(create_date(2009, 11, 17), 100));

// This script doesn't produce any 3D output
cube(1); // Add a small cube to avoid empty output warning