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diff --git a/src/alarm-queue-simple.cpp b/src/alarm-queue-simple.cpp
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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>
+ */
+
+#include <datetime/alarm-queue-simple.h>
+
+#include <cmath>
+
+namespace unity {
+namespace indicator {
+namespace datetime {
+
+/***
+****  Public API
+***/
+
+SimpleAlarmQueue::SimpleAlarmQueue(const std::shared_ptr<Clock>& clock,
+                                   const std::shared_ptr<Planner>& planner,
+                                   const std::shared_ptr<WakeupTimer>& timer):
+    m_clock(clock),
+    m_planner(planner),
+    m_timer(timer),
+    m_datetime(clock->localtime())
+{
+    m_planner->appointments().changed().connect([this](const std::vector<Appointment>&){
+        g_debug("AlarmQueue %p calling requeue() due to appointments changed", this);
+        requeue();
+    });
+
+    m_clock->minute_changed.connect([=]{
+        const auto now = m_clock->localtime();
+        constexpr auto skew_threshold_usec = int64_t{90} * G_USEC_PER_SEC;
+        const bool clock_jumped = std::abs(now - m_datetime) > skew_threshold_usec;
+        m_datetime = now;
+        if (clock_jumped) {
+            g_debug("AlarmQueue %p calling requeue() due to clock skew", this);
+            requeue();
+        }
+    });
+
+    m_timer->timeout().connect([this](){
+        g_debug("AlarmQueue %p calling requeue() due to timeout", this);
+        requeue();
+    });
+
+    requeue();
+}
+
+SimpleAlarmQueue::~SimpleAlarmQueue()
+{
+}
+
+core::Signal<const Appointment&>& SimpleAlarmQueue::alarm_reached()
+{
+    return m_alarm_reached;
+}
+
+/***
+****
+***/
+
+void SimpleAlarmQueue::requeue()
+{
+    // kick any current alarms
+    for (auto current : find_current_alarms())
+    {
+        const std::pair<std::string,DateTime> trig {current.uid, current.begin};
+        m_triggered.insert(trig);
+        m_alarm_reached(current);
+    }
+
+    // idle until the next alarm
+    Appointment next;
+    if (find_next_alarm(next))
+    {
+        g_debug ("setting timer to wake up for next appointment '%s' at %s", 
+                 next.summary.c_str(),
+                 next.begin.format("%F %T").c_str());
+
+        m_timer->set_wakeup_time(next.begin);
+    }
+}
+
+// find the next alarm that will kick now or in the future
+bool SimpleAlarmQueue::find_next_alarm(Appointment& setme) const
+{
+    bool found = false;
+    Appointment tmp;
+    const auto now = m_clock->localtime();
+    const auto beginning_of_minute = now.add_full (0, 0, 0, 0, 0, -now.seconds());
+
+    const auto appointments = m_planner->appointments().get();
+    g_debug ("planner has %zu appointments in it", (size_t)appointments.size());
+
+    for(const auto& walk : appointments)
+    {
+        const std::pair<std::string,DateTime> trig {walk.uid, walk.begin};
+        if (m_triggered.count(trig))
+            continue;
+
+        if (walk.begin < beginning_of_minute) // has this one already passed?
+            continue;
+
+        if (found && (tmp.begin < walk.begin)) // do we already have a better match?
+            continue;
+
+        tmp = walk;
+        found = true;
+    }
+
+    if (found)
+      setme = tmp;
+
+    return found;
+}
+
+// find the alarm(s) that should kick right now
+std::vector<Appointment> SimpleAlarmQueue::find_current_alarms() const
+{
+    std::vector<Appointment> appointments;
+
+    const auto now = m_clock->localtime();
+
+    for(const auto& walk : m_planner->appointments().get())
+    {
+        const std::pair<std::string,DateTime> trig {walk.uid, walk.begin};
+        if (m_triggered.count(trig)) // did we already use this one?
+            continue;
+        if (!DateTime::is_same_minute(now, walk.begin))
+            continue;
+
+        appointments.push_back(walk);
+    }
+
+    return appointments;
+}
+
+/***
+****
+***/
+
+} // namespace datetime
+} // namespace indicator
+} // namespace unity