diff --git a/src/util/time-unit-test-clock.hpp b/src/util/time-unit-test-clock.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#ifndef NDN_TIME_UNIT_TEST_CLOCK_HPP
+#define NDN_TIME_UNIT_TEST_CLOCK_HPP
+
+#include "time-custom-clock.hpp"
+
+namespace ndn {
+namespace time {
+
+
+/**
+ * @brief Traits for UnitTestClock, defining default behavior for different clocks
+ *
+ * The only behavior that is currently controlled by the traits is default start
+ * time.  The generic implementation assumes start time to be zero.
+ */
+template<class BaseClock>
+class UnitTestClockTraits
+{
+public:
+  static nanoseconds
+  getDefaultStartTime()
+  {
+    return nanoseconds::zero();
+  };
+};
+
+/**
+ * @brief Specialization of UnitTestClockTraits for system_clock
+ *
+ * This specialization sets the default start time to 1415684132 seconds
+ * (equivalent to Tue, 11 Nov 2014 05:35:32 UTC if unix epoch is assumed).
+ */
+template<>
+class UnitTestClockTraits<system_clock>
+{
+public:
+  static nanoseconds
+  getDefaultStartTime()
+  {
+    return seconds(1415684132);
+  };
+};
+
+/**
+ * @brief Clock that can be used in unit tests for time-dependent tests independent of wall clock
+ *
+ * This clock should be explicitly advanced with UnitTestClock<BaseClock>::advance() or set
+ * with UnitTestClock<BaseClock>::setNow() methods.
+ *
+ * @note Default start time is determined by UnitTestClockTraits
+ */
+template<class BaseClock>
+class UnitTestClock : public CustomClock<BaseClock>
+{
+public:
+  explicit
+  UnitTestClock(const nanoseconds& startTime =
+                UnitTestClockTraits<BaseClock>::getDefaultStartTime());
+
+  /**
+   * @brief Advance unit test clock by @p duration
+   */
+  void
+  advance(const nanoseconds& duration);
+
+  /**
+   * @brief Explicitly set clock to @p timeSinceEpoch
+   */
+  void
+  setNow(const nanoseconds& timeSinceEpoch);
+
+public: // CustomClock<BaseClock>
+
+  virtual std::string
+  getSince() const;
+
+  virtual typename BaseClock::time_point
+  getNow() const;
+
+  virtual boost::posix_time::time_duration
+  toPosixDuration(const typename BaseClock::duration& duration) const;
+
+private:
+  nanoseconds m_currentTime;
+};
+
+typedef UnitTestClock<system_clock> UnitTestSystemClock;
+typedef UnitTestClock<steady_clock> UnitTestSteadyClock;
+
+} // namespace time
+} // namespace ndn
+
+#endif // NDN_TIME_UNIT_TEST_CLOCK_HPP