#### basic_waitable_timer::expires_at

(Deprecated: Use `expiry()`.) Get the timer's expiry time as an absolute time.

    time_point expires_at() const;
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Set the timer's expiry time as an absolute time.

    std::size_t expires_at(
        const time_point & expiry_time);
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(Deprecated: Use non-error_code overload.) Set the timer's expiry time as an absolute time.

    std::size_t expires_at(
        const time_point & expiry_time,
        asio::error_code & ec);
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