No plug involved, the JS-triggered GET request calls a controller function:
def timezone(conn, %{"iana" => iana}) do
cond do
get_session(conn, "tmzn") -> text(conn, "action skipped")
Enum.member?(Timex.timezones(), iana) -> conn |> put_session("tmzn", iana) |> text("action successful")
true -> text(conn, "action failed")
end
end
Then a function like the one below may be called from any Phoenix view:
def local_datetime(conn, datetime) do
{datetime, prefix} = if tmzn = get_session(conn, "tmzn"), do: {Timex.Timezone.convert(datetime, tmzn), ""}, else: {datetime, "⦗UTC⦘ "}
[prefix, Timex.format!(datetime, "{h24}:{m}:{s} on {Mshort} {D}, {YYYY}")] # unrecognized timezone or no timezone information ↑
end
