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diff --git a/lib/asio/detail/timer_queue_ptime.hpp b/lib/asio/detail/timer_queue_ptime.hpp
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+//
+// detail/timer_queue_ptime.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_TIMER_QUEUE_PTIME_HPP
+#define ASIO_DETAIL_TIMER_QUEUE_PTIME_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_HAS_BOOST_DATE_TIME)
+
+#include "asio/time_traits.hpp"
+#include "asio/detail/timer_queue.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+struct forwarding_posix_time_traits : time_traits<boost::posix_time::ptime> {};
+
+// Template specialisation for the commonly used instantation.
+template <>
+class timer_queue<time_traits<boost::posix_time::ptime> >
+  : public timer_queue_base
+{
+public:
+  // The time type.
+  typedef boost::posix_time::ptime time_type;
+
+  // The duration type.
+  typedef boost::posix_time::time_duration duration_type;
+
+  // Per-timer data.
+  typedef timer_queue<forwarding_posix_time_traits>::per_timer_data
+    per_timer_data;
+
+  // Constructor.
+  ASIO_DECL timer_queue();
+
+  // Destructor.
+  ASIO_DECL virtual ~timer_queue();
+
+  // Add a new timer to the queue. Returns true if this is the timer that is
+  // earliest in the queue, in which case the reactor's event demultiplexing
+  // function call may need to be interrupted and restarted.
+  ASIO_DECL bool enqueue_timer(const time_type& time,
+      per_timer_data& timer, wait_op* op);
+
+  // Whether there are no timers in the queue.
+  ASIO_DECL virtual bool empty() const;
+
+  // Get the time for the timer that is earliest in the queue.
+  ASIO_DECL virtual long wait_duration_msec(long max_duration) const;
+
+  // Get the time for the timer that is earliest in the queue.
+  ASIO_DECL virtual long wait_duration_usec(long max_duration) const;
+
+  // Dequeue all timers not later than the current time.
+  ASIO_DECL virtual void get_ready_timers(op_queue<operation>& ops);
+
+  // Dequeue all timers.
+  ASIO_DECL virtual void get_all_timers(op_queue<operation>& ops);
+
+  // Cancel and dequeue operations for the given timer.
+  ASIO_DECL std::size_t cancel_timer(
+      per_timer_data& timer, op_queue<operation>& ops,
+      std::size_t max_cancelled = (std::numeric_limits<std::size_t>::max)());
+
+  // Move operations from one timer to another, empty timer.
+  ASIO_DECL void move_timer(per_timer_data& target,
+      per_timer_data& source);
+
+private:
+  timer_queue<forwarding_posix_time_traits> impl_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/timer_queue_ptime.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // defined(ASIO_HAS_BOOST_DATE_TIME)
+
+#endif // ASIO_DETAIL_TIMER_QUEUE_PTIME_HPP