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diff --git a/src/boost/libs/chrono/example/xtime.cpp b/src/boost/libs/chrono/example/xtime.cpp
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+++ b/src/boost/libs/chrono/example/xtime.cpp
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+//  xtime.cpp  ----------------------------------------------------------//
+
+//  Copyright 2008 Howard Hinnant
+//  Copyright 2008 Beman Dawes
+//  Copyright 2009 Vicente J. Botet Escriba
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+/*
+This code was extracted by Vicente J. Botet Escriba from Beman Dawes time2_demo.cpp which
+was derived by Beman Dawes from Howard Hinnant's time2_demo prototype.
+Many thanks to Howard for making his code available under the Boost license.
+The original code was modified to conform to Boost conventions and to section
+20.9 Time utilities [time] of the C++ committee's working paper N2798.
+See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2798.pdf.
+
+time2_demo contained this comment:
+
+    Much thanks to Andrei Alexandrescu,
+                   Walter Brown,
+                   Peter Dimov,
+                   Jeff Garland,
+                   Terry Golubiewski,
+                   Daniel Krugler,
+                   Anthony Williams.
+*/
+
+#include <boost/chrono/chrono.hpp>
+#include <boost/type_traits.hpp>
+
+#include <iostream>
+
+using namespace boost::chrono;
+
+// Example round_up utility:  converts d to To, rounding up for inexact conversions
+//   Being able to *easily* write this function is a major feature!
+template <class To, class Rep, class Period>
+To
+round_up(duration<Rep, Period> d)
+{
+    To result = duration_cast<To>(d);
+    if (result < d)
+        ++result;
+    return result;
+}
+
+// demonstrate interaction with xtime-like facility:
+
+struct xtime
+{
+    long sec;
+    unsigned long usec;
+};
+
+template <class Rep, class Period>
+xtime
+to_xtime_truncate(duration<Rep, Period> d)
+{
+    xtime xt;
+    xt.sec = static_cast<long>(duration_cast<seconds>(d).count());
+    xt.usec = static_cast<long>(duration_cast<microseconds>(d - seconds(xt.sec)).count());
+    return xt;
+}
+
+template <class Rep, class Period>
+xtime
+to_xtime_round_up(duration<Rep, Period> d)
+{
+    xtime xt;
+    xt.sec = static_cast<long>(duration_cast<seconds>(d).count());
+    xt.usec = static_cast<unsigned long>(round_up<microseconds>(d - seconds(xt.sec)).count());
+    return xt;
+}
+
+microseconds
+from_xtime(xtime xt)
+{
+    return seconds(xt.sec) + microseconds(xt.usec);
+}
+
+void print(xtime xt)
+{
+    std::cout << '{' << xt.sec << ',' << xt.usec << "}\n";
+}
+
+void test_with_xtime()
+{
+    std::cout << "test_with_xtime\n";
+    xtime xt = to_xtime_truncate(seconds(3) + milliseconds(251));
+    print(xt);
+    milliseconds ms = duration_cast<milliseconds>(from_xtime(xt));
+    std::cout << ms.count() << " milliseconds\n";
+    xt = to_xtime_round_up(ms);
+    print(xt);
+    xt = to_xtime_truncate(seconds(3) + nanoseconds(999));
+    print(xt);
+    xt = to_xtime_round_up(seconds(3) + nanoseconds(999));
+    print(xt);
+}
+
+
+int main()
+{
+    test_with_xtime();
+    return 0;
+}
+