I've made a first draft for the proposal to add

> template <class Clock, class Duration, class... Ls>
> [[nodiscard]] bool
> try_lock_until(const chrono::time_point<Clock, Duration>& abs_time,
> Ls&... ls);
>
> template <class Rep, class Period, class... Ls>
> [[nodiscard]] bool
> try_lock_for(const chrono::duration<Rep, Period>& rel_time,
> Ls&... ls);
which I've attached. This is the first time I've even come this far with
an idea and I would be very greatful for feedback.

Best regards,
Ted Lyngmo