Roblox Timer/Clock Script

local RunService = game:GetService("RunService")

local TIMER_BINDING_NAME = "Timer"

local label = script.Parent

local function startTimer(timeLeft)
    local delayEvent = Instance.new("BindableEvent")

    RunService:BindToRenderStep(TIMER_BINDING_NAME, Enum.RenderPriority.Last.Value - 1, function(delta)
        -- delta is the time since the last frame
        -- 01:30:01
        timeLeft -= delta

        local minutes = math.floor(timeLeft / 60)
        local seconds = math.floor(timeLeft % 60)
        local hundreths = math.floor(timeLeft % 1 * 100)

        label.Text = string.format("%02i:%02i:%02i", minutes, seconds, hundreths)

        if timeLeft <= 0 then
            delayEvent:Fire()
            RunService:UnbindFromRenderStep(TIMER_BINDING_NAME)
        end

    end)

    delayEvent.Event:Wait()
end

startTimer(10)
label.Text = "Done"