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#### deadline_timer_service::expires_from_now

Get the expiry time for the timer relative to now.

    duration_type expires_from_now(
        const implementation_type & impl) const;

Set the expiry time for the timer relative to now.

    std::size_t expires_from_now(
        implementation_type & impl,
        const duration_type & expiry_time,
        boost::system::error_code & ec);