diff --git a/addons/calendar/models/calendar.py b/addons/calendar/models/calendar.py
index 3c7e24c9187..fc296be5abc 100644
--- a/addons/calendar/models/calendar.py
+++ b/addons/calendar/models/calendar.py
@@ -58,6 +58,23 @@ def get_real_ids(ids):
 def real_id2calendar_id(record_id, date):
     return '%s-%s' % (record_id, date.strftime(VIRTUALID_DATETIME_FORMAT))
 
+def any_id2key(record_id):
+    """ Creates a (real_id: int, thing: str) pair which allows ordering mixed
+    collections of real and virtual events.
+
+    The first item of the pair is the event's real id, the second one is
+    either an empty string (for real events) or the datestring (for virtual
+    ones)
+
+    :param record_id:
+    :type record_id: int | str
+    :rtype: (int, str)
+    """
+    if isinstance(record_id, pycompat.integer_types):
+        return record_id, u''
+
+    (real_id, virtual_id) = record_id.split('-')
+    return int(real_id), virtual_id
 
 def is_calendar_id(record_id):
     return len(str(record_id).split('-')) != 1
@@ -1124,9 +1141,15 @@ class Meeting(models.Model):
             for key in (order or self._order).split(',')
         ))
         def key(record):
-            return [
-                tools.Reverse(record[name]) if desc else record[name]
+            # first extract the values for each key column (ids need special treatment)
+            vals_spec = (
+                (any_id2key(record[name]) if name == 'id' else record[name], desc)
                 for name, desc in sort_spec
+            )
+            # then Reverse if the value matches a "desc" column
+            return [
+                (tools.Reverse(v) if desc else v)
+                for v, desc in vals_spec
             ]
         return [r['id'] for r in sorted(result_data, key=key)]
 
diff --git a/doc/cla/individual/manhg.md b/doc/cla/individual/manhg.md
new file mode 100644
index 00000000000..d15e6e91fe9
--- /dev/null
+++ b/doc/cla/individual/manhg.md
@@ -0,0 +1,11 @@
+Japan, 2017-10-19
+
+I hereby agree to the terms of the Odoo Individual Contributor License
+Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this
+declaration.
+
+Signed,
+
+Giang Manh manhg@users.noreply.github.com https://github.com/manhg
\ No newline at end of file