(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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