Intl data via LiveView connect params

intl.ex

defmodule MyAppWeb.Intl do
  @moduledoc """
  Loads internationalization info from socket.
  """
  import Phoenix.LiveView

  def on_mount(:default, _params, _session, socket) do
    cparams = get_connect_params(socket)

    {:cont,
     socket
     |> assign(:locale, cparams["_intl_locale"])
     |> assign(:timezone, cparams["_intl_timezone"])
     |> assign(:timezone_offset, cparams["_intl_timezone_offset"])}
  end
end

intl_live_view.js

let liveSocket = new LiveSocket("/live", Socket, {
  hooks: Hooks,
  params: {
    _csrf_token: csrfToken,
    _intl_locale: Intl.NumberFormat().resolvedOptions().locale,
    _intl_timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
    _intl_timezone_offset: -(new Date().getTimezoneOffset() / 60),
  },
})

router.ex

scope "/", MyAppWeb do
  pipe_through :browser

  live_session :default, on_mount: [MyAppWeb.Intl] do
    live "/", PageLive.Index, :index
  end
end