'How to get the average of several chrono::time_points

The formula for getting the average of several numbers is of course well known:

And this formula can easily be used to get the average of chrono::durations:

template <class Rep0, class Period0>
auto
sum(const std::chrono::duration<Rep0, Period0>& d0)
{
    return d0;
}

template <class Rep0, class Period0, class ...Rep, class ...Period>
auto
sum(const std::chrono::duration<Rep0, Period0>& d0,
    const std::chrono::duration<Rep, Period>& ...d)
{
    return d0 + sum(d...);
}

template <class ...Rep, class ...Period>
auto
avg(const std::chrono::duration<Rep, Period>& ...d)
{
    return sum(d...) / static_cast<std::common_type_t<Rep...>>(sizeof...(d));
}

But chrono::time_points can't be added to one another. How can I average time_points?

c++c++14chrono


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