How do I turn a IntValue into hours and seconds?

I'm stuck on how to turn the IntValue that has a value of 86400(seconds in a day). How do I turn the value into Hours and seconds? I have checked online the wiki and haven't been able to find anything to answer my question. Please, if possible give me some help

local plr = game.Players.LocalPlayer
local hasjoined = plr.hasjoined
local val = script.Parent.Timer
local sp = script.Parent.Parent.Parent.StarterPack
local repstore = game:GetService("ReplicatedStorage") 
local rem = repstore.RemoteFolder:WaitForChild("StarterPackUpdate")

if hasjoined.Value == false then
    while wait(1) do
    val.Value = val.Value - 1
    script.Parent.Text = "".. val.Value ..""

    if val.Value == 0 then
        sp.Visible = false
        rem:FireServer("updateSP")
        print("fired")
elseif
        hasjoined.Value == true then
        sp.Visible = false
end
end
end