Military Clock Converter but not full clock

-- Military Clock Converter (but better)

seconds = 72 -- seconds is now the ONLY input (for a music gui I'm making)
minutes = 0

while seconds >= 60 do
    minutes = minutes + 1
    seconds = seconds - 60
end

--Line of strings

if seconds < 10 then
    seconds = "0"..tostring(seconds)
end

print(minutes..":"..seconds)