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diff --git a/include/datetime/clock.h b/include/datetime/clock.h
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+++ b/include/datetime/clock.h
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+/*
+ * Copyright 2013 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#ifndef INDICATOR_DATETIME_CLOCK_H
+#define INDICATOR_DATETIME_CLOCK_H
+
+#include <datetime/date-time.h>
+
+#include <core/property.h>
+#include <core/signal.h>
+
+#include <gio/gio.h> // GDBusConnection
+
+#include <memory> // std::shared_ptr, std::unique_ptr
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+/**
+ * \brief A clock.
+ */
+class Clock
+{
+public:
+    virtual ~Clock();
+    virtual DateTime localtime() const =0;
+
+    /** \brief A signal which fires when the clock's minute changes */
+    core::Signal<> minuteChanged;
+
+    /** \brief A signal which fires when the clock's date changes */
+    core::Signal<> dateChanged;
+
+protected:
+    Clock();
+
+    /** \brief Compares old and new times, emits minuteChanged() or dateChanged() signals if appropriate */
+    void maybe_emit (const DateTime& a, const DateTime& b);
+
+private:
+    static void onSystemBusReady(GObject*, GAsyncResult*, gpointer);
+    static void onPrepareForSleep(GDBusConnection*, const gchar*, const gchar*, const gchar*, const gchar*, GVariant*, gpointer);
+
+    GCancellable * m_cancellable = nullptr;
+    GDBusConnection * m_system_bus = nullptr;
+    unsigned int m_sleep_subscription_id = 0;
+
+    // we've got raw pointers and GSignal tags in here, so disable copying
+    Clock(const Clock&) =delete;
+    Clock& operator=(const Clock&) =delete;
+};
+
+/***
+****
+***/
+
+class Timezones;
+
+/**
+ * \brief A live #Clock that provides the actual system time.
+ */
+class LiveClock: public Clock
+{
+public:
+    LiveClock (const std::shared_ptr<Timezones>& zones);
+    virtual ~LiveClock();
+    virtual DateTime localtime() const;
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> p;
+};
+
+/***
+****
+***/
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity
+
+#endif // INDICATOR_DATETIME_CLOCK_H