Changing a decal to a group icon? (SOLVED)

How do I make a decal so it's always a group's icon and when the icon changes it updates in new servers? I know there's one for player icons, but I don't know what the equivalent for groups is, sorry for the short question but it's a simple one that nobody seems to be answering on the discord.

You need to know some details about os.time.Which i will explain now.

In os.time,you can get the year,month,day,hour,minute and second.The real name of os.time is Unix Time.For example unix time is now is 1591474844 which is 23:21 in clock time.Here i will give you a basic code

local unixtime = os.time()
olddecal = "your decal id now"
newdecal = "your new/future/updated decal id"
local decal = game.Workspace --change this to your decal

unixtime.Changed:Connect(function()
print(unixtime)
if unixtime == 1591488000 then  --which is 24:00 today
decal.Texture = newdecal --will change the decal if unix time is 1591488000 (06.07.2020 24:00 AM)
else
decal.Texture = olddecal --if unix time is not 1591488000 (06.07.2020 24:00 AM) then the decal is still the old one
end
end)

I will give you this website which you can convert time to unix time.

Hope this will helps!

Edit:This is like a live-event which will happen on all servers.And DONT FORGET TO CLICK GOOD ANSWER