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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/datetime.hpp
+/// Provides date and time-related classes and functions.
+
+#if !defined(UTILS_DATETIME_HPP)
+#define UTILS_DATETIME_HPP
+
+#include "utils/datetime_fwd.hpp"
+
+extern "C" {
+#include <stdint.h>
+}
+
+#include <cstddef>
+#include <memory>
+#include <ostream>
+#include <string>
+
+
+namespace utils {
+namespace datetime {
+
+
+/// Represents a time delta to describe deadlines.
+///
+/// Because we use this class to handle deadlines, we currently do not support
+/// negative deltas.
+class delta {
+public:
+    /// The amount of seconds in the time delta.
+    int64_t seconds;
+
+    /// The amount of microseconds in the time delta.
+    unsigned long useconds;
+
+    delta(void);
+    delta(const int64_t, const unsigned long);
+
+    static delta from_microseconds(const int64_t);
+    int64_t to_microseconds(void) const;
+
+    bool operator==(const delta&) const;
+    bool operator!=(const delta&) const;
+    bool operator<(const delta&) const;
+    bool operator<=(const delta&) const;
+    bool operator>(const delta&) const;
+    bool operator>=(const delta&) const;
+
+    delta operator+(const delta&) const;
+    delta& operator+=(const delta&);
+    // operator- and operator-= do not exist because we do not support negative
+    // deltas.  See class docstring.
+    delta operator*(const std::size_t) const;
+    delta& operator*=(const std::size_t);
+};
+
+
+std::ostream& operator<<(std::ostream&, const delta&);
+
+
+/// Represents a fixed date/time.
+///
+/// Timestamps are immutable objects and therefore we can simply use a shared
+/// pointer to hide the implementation type of the date.  By not using an auto
+/// pointer, we don't have to worry about providing our own copy constructor and
+/// assignment opertor.
+class timestamp {
+    struct impl;
+
+    /// Pointer to the shared internal implementation.
+    std::shared_ptr< impl > _pimpl;
+
+    timestamp(std::shared_ptr< impl >);
+
+public:
+    static timestamp from_microseconds(const int64_t);
+    static timestamp from_values(const int, const int, const int,
+                                 const int, const int, const int,
+                                 const int);
+    static timestamp now(void);
+
+    std::string strftime(const std::string&) const;
+    std::string to_iso8601_in_utc(void) const;
+    int64_t to_microseconds(void) const;
+    int64_t to_seconds(void) const;
+
+    bool operator==(const timestamp&) const;
+    bool operator!=(const timestamp&) const;
+    bool operator<(const timestamp&) const;
+    bool operator<=(const timestamp&) const;
+    bool operator>(const timestamp&) const;
+    bool operator>=(const timestamp&) const;
+
+    timestamp operator+(const delta&) const;
+    timestamp& operator+=(const delta&);
+    timestamp operator-(const delta&) const;
+    timestamp& operator-=(const delta&);
+    delta operator-(const timestamp&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const timestamp&);
+
+
+void set_mock_now(const int, const int, const int, const int, const int,
+                  const int, const int);
+void set_mock_now(const timestamp&);
+
+
+}  // namespace datetime
+}  // namespace utils
+
+#endif // !defined(UTILS_DATETIME_HPP)