How to count the time when the player joins and leaves?

EDIT: Sorry for my bad explanation. I want to count the amount of time the player been playing for. when the player leaves the server it calculates the time duration then sends a log to my discord server.

This is my attempt. It only works for one person for some reason Let's say there's two players on a server, when the first leaves it works fine, but for the second it doesn't.

local webhook = ""

  

local http = game:GetService('HttpService')

  

local Embed_Colors = {

0xFF0000,

0xFF7F00,

0xFFFF00,

0x00FF00,

0x0000FF,

0x8B00FF

}

  

function get_ebic_date(t)

local date_table = os.date("!*t", t)

local year, month, day, hour, min, sec = date_table.year, date_table.month, date_table.day, date_table.hour, date_table.min, date_table.sec

local period = "AM"

if hour >= 12 then

period = "PM"

hour = hour ~= 12 and hour - 12 or hour

end

local last_date = string.format("%d-%d-%d", year, month, day) .. " UTC" .. "\n" .. string.format("%.2d:%.2d:%.2d %s", hour, min, sec, period)

return last_date

end

  

function get_ebic_time(thetime)

local timefloor = math.floor(thetime)

local hours = math.floor(thetime / 3600)

local mins = math.floor(thetime / 60)

local secs = math.floor(thetime % 60)

local hour_form = hours < 10 and "0" .. hours or hours

local min_form = mins < 10 and "0" .. mins or mins

local sec_form = secs < 10 and "0" .. secs or secs

local readytime = hour_form .. " hours, " .. min_form .. " minutes, and " .. sec_form .. " seconds."

return readytime

end

function embed(player, timing)

local data = {

["avatar_url"] = "https://t6.rbxcdn.com/e92158c999f48841ac15d66adc6502c8",

["username"] = "Cannonial Activity System",

["embeds"] = {{

["color"] = Embed_Colors[math.random(1,#Embed_Colors)],

["title"] = "Profile Link",

["url"] = "https://www.roblox.com/users/" .. player.UserId .. "/profile",

fields = {

{name = "Name", value = player.Name, inline = true},

{name = "Rank", value = tostring(player:GetRoleInGroup(3405614)), inline = true},

{name = "Time Spent", value = timing},

{name = "Date Assigned", value = get_ebic_date()}

},

}}

}

return data

end

  

function send(player, timing)

local json = http:JSONEncode(embed(player, timing))

http:PostAsync(webhook, json, Enum.HttpContentType.ApplicationJson)

end

  

local staff = {}

  

function duration(player)

if player:GetRankInGroup(3405614) >= 50 then

staff[player] = os.time()

end

end

  

function count_end(player, now)

if player:GetRankInGroup(3405614) >= 50 then

now = get_ebic_time(os.time() - staff[player])

send(player, now)

end

end

  

game.Players.PlayerAdded:connect(duration)

game.Players.PlayerRemoving:connect(count_end)