Surface GUI Textbutton help?

I'm a 1-2/10 scripter so I'm still trying to learn but I'm stuck on this, I looked around and couldn't find anything that helpful.

enabled = true

script.Parent.TextButton.MouseButton1Click:connect(function()
	if enabled then -- NIGHT TIME
		game.Lighting.TimeOfDay = "20:00:00"
		game.Lighting.OutdoorAmbient = Color3.new(0.395,0.395,0.395)
		game.Lighting.Brightness = 0.5
		game.Lighting.FogColor = Color3.new(0.0395,0.0395,0.120)
		game.Lighting.FogEnd = 1000
		enabled = false
	else -- DAY TIME
		game.Lighting.TimeOfDay = "15:00:00"
		game.Lighting.OutdoorAmbient = Color3.new(0.5,0.5,0.5)
		game.Lighting.Brightness = 1
		game.Lighting.FogColor = Color3.new(0.749,0.749,0.749)
		game.Lighting.FogEnd = 2500
		enabled = true
	end
end

I want the SurfaceGUI Textbutton to be clicked to change the day. It works if I use a regular block but I want it on a SurfaceGUI and i'm having trouble. Can anyone help fix this? Really helpful if anyone could clarify this for me!

I polished it up a bit and it works now, thanks!

enabled = true

function Solar()
	if enabled then -- NIGHT TIME
		game.Lighting.TimeOfDay = "20:00:00"
		game.Lighting.OutdoorAmbient = Color3.new(0.395,0.395,0.395)
		game.Lighting.Brightness = 0.5
		game.Lighting.FogColor = Color3.new(0.0395,0.0395,0.120)
		game.Lighting.FogEnd = 1000
		enabled = false
	else -- DAY TIME
		game.Lighting.TimeOfDay = "15:00:00"
		game.Lighting.OutdoorAmbient = Color3.new(0.5,0.5,0.5)
		game.Lighting.Brightness = 1
		game.Lighting.FogColor = Color3.new(0.749,0.749,0.749)
		game.Lighting.FogEnd = 2500
		enabled = true
	end
end

script.Parent.TextButton.MouseButton1Click:connect(Solar)