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diff --git a/include/datetime/clock-watcher.h b/include/datetime/clock-watcher.h
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+/*
+ * Copyright 2014 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_WATCHER_H
+#define INDICATOR_DATETIME_CLOCK_WATCHER_H
+
+#include <datetime/appointment.h>
+#include <datetime/clock.h>
+#include <datetime/planner-upcoming.h>
+
+#include <core/signal.h>
+
+#include <memory>
+#include <set>
+#include <string>
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+
+/**
+ * \brief Watches the clock and appointments to notify when an
+ *        appointment's time is reached.
+ */
+class ClockWatcher
+{
+public:
+    ClockWatcher() =default;
+    virtual ~ClockWatcher() =default;
+    virtual core::Signal<const Appointment&>& alarm_reached() = 0;
+};
+
+
+/**
+ * \brief A #ClockWatcher implementation 
+ */
+class ClockWatcherImpl: public ClockWatcher
+{
+public:
+    ClockWatcherImpl(const std::shared_ptr<Clock>& clock,
+                     const std::shared_ptr<UpcomingPlanner>& upcoming_planner);
+    ~ClockWatcherImpl() =default;
+    core::Signal<const Appointment&>& alarm_reached();
+
+private:
+    void pulse();
+    std::set<std::string> m_triggered;
+    const std::shared_ptr<Clock> m_clock;
+    const std::shared_ptr<UpcomingPlanner> m_upcoming_planner;
+    core::Signal<const Appointment&> m_alarm_reached;
+};
+
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity
+
+#endif // INDICATOR_DATETIME_CLOCK_WATCHER_H