How to show clock?

This is a function of the desktop. It should instead show signs CLOCK playing time.
playing time.

function DESKTOP()
while true do
term.setTextColor(1)
term.setBackgroundColor(1)
term.clear()

paintutils.drawPixel(1, 1, colors.red)
paintutils.drawLine(1, 1, 51, 1, colors.red)
paintutils.drawLine(1, 19, 51, 19, colors.red)

paintutils.drawLine(2, 1, 4, 1, colors.gray)
term.setCursorPos(2,1)
term.write('EOS')

paintutils.drawLine(46, 1, 50, 1, colors.gray)
term.setCursorPos(46,1)
term.write( CLOCK )

local event, button, xPos, yPos = os.pullEvent("mouse_click")

if xPos == 2 and yPos == 1 then
menu()
elseif xPos == 3 and yPos == 1 then
menu()
elseif xPos == 4 and yPos == 1 then
menu()
end
end
end


I wrote instead CLOCK

textutils.formatTime (os.time (), false

, but the time is updated only when the mouse button is pressed. Help, please :)/>

Of course the clock is only updated when someone clicks - your loop always pauses and asks for a mouse_click event. Here's a hint: never, ever, ever use event filters. Another hint: check out os.startTimer.