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diff --git a/include/datetime/engine.h b/include/datetime/engine.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_ENGINE__H
+#define INDICATOR_DATETIME_ENGINE__H
+
+#include <datetime/appointment.h>
+#include <datetime/date-time.h>
+#include <datetime/timezone.h>
+
+#include <functional>
+#include <vector>
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+/****
+*****
+****/
+
+/**
+ * Class wrapper around the backend that generates appointments
+ * 
+ * @see EdsEngine
+ * @see EdsPlanner
+ */
+class Engine
+{
+public:
+    virtual ~Engine() =default;
+
+    virtual void get_appointments(const DateTime& begin,
+                                  const DateTime& end,
+                                  const Timezone& default_timezone,
+                                  std::function<void(const std::vector<Appointment>&)> appointment_func) =0;
+
+    virtual core::Signal<>& changed() =0;
+
+protected:
+    Engine() =default;
+};
+
+/***
+****
+***/
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity
+
+#endif // INDICATOR_DATETIME_ENGINE__H