"write a roblox script that will slowly and smoothly make the ambient green and smoothly change to the clocktime to 0, also tell where to put it."

To achieve this effect, you can use a TweenService to smoothly change the ambient color and clock time. Place this script in ServerScriptService.

```lua
-- Server script
local TweenService = game:GetService("TweenService")
local Lighting = game:GetService("Lighting")

local function changeAmbientColor(targetColor, duration)
    local tweenInfo = TweenInfo.new(duration, Enum.EasingStyle.Linear, Enum.EasingDirection.InOut)
    local tween = TweenService:Create(Lighting, tweenInfo, {Ambient = targetColor})
    tween:Play()
end

local function changeClockTime(targetTime, duration)
    local startTime = Lighting.ClockTime
    local elapsedTime = 0
    while elapsedTime < duration do
        Lighting.ClockTime = startTime + (targetTime - startTime) * (elapsedTime / duration)
        elapsedTime = elapsedTime + 1/30
        wait(1/30)
    end
    Lighting.ClockTime = targetTime
end

-- Change ambient color to green over 5 seconds
changeAmbientColor(Color3.fromRGB(0, 255, 0), 5)

-- Change clock time to 0 over 5 seconds
changeClockTime(0, 5)
```

This script will smoothly change the ambient color to green and the clock time to 0 over a duration of 5 seconds. Make sure to replace the duration values with your desired duration.