Computercraft datetime

-- Wrap the monitor on the right side
local monitor = peripheral.wrap("right")

-- Function to convert in-game days to a calendar date
local function convertToDate(day)
    local year = math.floor((day - 1) / 365) + 1
    local dayOfYear = (day - 1) % 365 + 1

    local months = {
        {name = "January", days = 31},
        {name = "February", days = 28},
        {name = "March", days = 31},
        {name = "April", days = 30},
        {name = "May", days = 31},
        {name = "June", days = 30},
        {name = "July", days = 31},
        {name = "August", days = 31},
        {name = "September", days = 30},
        {name = "October", days = 31},
        {name = "November", days = 30},
        {name = "December", days = 31},
    }

    local month = 1
    local dayOfMonth = dayOfYear

    for i, m in ipairs(months) do
        if dayOfMonth <= m.days then
            month = i
            break
        end
        dayOfMonth = dayOfMonth - m.days
    end

    return dayOfMonth, month, year
end

-- Function to print the current time and date
local function printTimeAndDate()
    -- Clear the monitor
    monitor.clear()
    monitor.setCursorPos(1, 1)

    -- Get the current time and date
    local time = os.time()
    local day = os.day()

    -- Convert the in-game day to a calendar date
    local dayOfMonth, month, year = convertToDate(day)

    -- Format the time (in-game time from 0 to 24)
    local hours = math.floor(time)
    local minutes = math.floor((time - hours) * 60)

    -- Print the date and time on the monitor
    monitor.write(string.format("Date: %02d/%02d/%03d", dayOfMonth, month, year))
    monitor.setCursorPos(1, 2)
    monitor.write(string.format("Time: %02d:%02d", hours, minutes))
end

-- Main loop to update the time and date every second
while true do
    printTimeAndDate()
    sleep(1)
end