diff --git a/calendar/base/public/calICalendarViewController.idl b/calendar/base/public/calICalendarViewController.idl
new file mode 100644
index 000000000000..c4a0cdd5e4da
--- /dev/null
+++ b/calendar/base/public/calICalendarViewController.idl
@@ -0,0 +1,83 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is calendar views.
+ *
+ * The Initial Developer of the Original Code is
+ *   Oracle Corporation
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+
+#include "nsISupports.idl"
+
+interface calICalendar;
+interface calIDateTime;
+interface calIEvent;
+
+[scriptable, uuid(1f783898-f4c2-4b2d-972e-360e0de38237)]
+interface calICalendarViewController : nsISupports
+{
+  /**
+   * Create an event, with an optional start time and optional end
+   * time in the given Calendar.  The Calendar will be the
+   * displayCalendar set on the View which invokes this method
+   * on the controller.
+   *
+   * If neither aStartTime or aEndTime are given, the user wants to
+   * create a generic event with no information prefilled.
+   *
+   * If aStartTime is given and is a date, the user wants to
+   * create an all day event, optionally a multi-all-day event if
+   * aEndTime is given (and is also a date).
+   *
+   * If aStartTime is given and is a time, but no aEndTime is
+   * given, the user wants to create an event starting at
+   * aStartTime and of the default duration.
+   *
+   * If both aStartTime and aEndTime are given as times, then
+   * the user wants to create an event going from aStartTime
+   * to aEndTime.
+   */
+  void createNewEvent (in calICalendar aCalendar,
+		       in calIDateTime aStartTime,
+		       in calIDateTime aEndTime);
+
+  /**
+   * Modify aEvent to start at aNewStartTime and end at
+   * aNewEndTime.
+   */
+  void modifyEventTime (in calICalendar aCalendar,
+			in calIEvent aEvent,
+			in calIDateTime aNewStartTime,
+			in calIDateTime aNewEndTime);
+};
+