Fuzzy time in Elixir

def from_now(%DateTime{} = later) do
    now = DateTime.utc_now()
    diff = DateTime.diff(now, later)
    do_from_now(diff)
end

def from_now(%NaiveDateTime{} = later) do
    now = NaiveDateTime.utc_now()
    diff = NaiveDateTime.diff(now, later)
    do_from_now(diff)
end

def from_now(_), do: "never"

def do_from_now(diff) do
    cond do
      diff <= -24 * 3600 -> "in #{div(-diff, 24 * 3600)} days"
      diff <= -3600 -> "in #{div(-diff, 3600)} hours"
      diff <= -60 -> "in #{div(-diff, 60)} minutes"
      diff <= -5 -> "in #{-diff} seconds"
      diff <= 5 -> "now"
      diff <= 60 -> "#{diff} seconds ago"
      diff <= 3600 -> "#{div(diff, 60)} minutes ago"
      diff <= 24 * 3600 -> "#{div(diff, 3600)} hours ago"
      true -> "#{div(diff, 24 * 3600)} days ago"
    end
end