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diff --git a/calendar/cal-util/cal-recur.h b/calendar/cal-util/cal-recur.h
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+++ b/calendar/cal-util/cal-recur.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * Evolution calendar recurrence rule functions
+ *
+ * Copyright (C) 2000 Helix Code, Inc.
+ *
+ * Author: Damon Chaplin <damon@helixcode.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef CAL_RECURL_H
+#define CAL_RECUR_H
+
+#include <libgnome/gnome-defs.h>
+#include <glib.h>
+
+BEGIN_GNOME_DECLS
+
+
+/* FIXME: I've put modified versions of RecurType and Recurrence here, since
+   the ones in calobj.h don't support all of iCalendar. Hopefully Seth will
+   update those soon and these can be removed. */
+
+enum RecurType {
+	RECUR_YEARLY,
+	RECUR_MONTHLY,
+	RECUR_WEEKLY,
+	RECUR_DAILY,
+	RECUR_HOURLY,
+	RECUR_MINUTELY,
+	RECUR_SECONDLY,
+};
+
+typedef struct {
+	enum RecurType type;
+
+	int            interval;
+
+	int            weekday;
+
+	int	       month_pos;
+
+	int	       month_day;
+
+
+	/* For BYMONTH modifier. A list of GINT_TO_POINTERs, 0-11. */
+	GList	      *bymonth;
+
+
+	/* For BYHOUR modifier. A list of GINT_TO_POINTERs, 0-23. */
+	GList	      *byhour;
+
+	/* For BYMINUTE modifier. A list of GINT_TO_POINTERs, 0-59. */
+	GList	      *byminute;
+
+	/* For BYSECOND modifier. A list of GINT_TO_POINTERs, 0-60. */
+	GList	      *bysecond;
+
+} Recurrence;
+
+
+
+/* This is what we use to represent a date & time. */
+typedef struct _CalObjTime CalObjTime;
+struct _CalObjTime {
+	guint16 year;
+	guint8 month;		/* 0 - 11 */
+	guint8 day;		/* 1 - 31 */
+	guint8 hour;		/* 0 - 23 */
+	guint8 minute;		/* 0 - 59 */
+	guint8 second;		/* 0 - 59 (maybe 60 for leap second) */
+};
+
+
+
+/* Returns an unsorted array of time_t's resulting from expanding the
+   recurrence within the given interval. Each iCalendar event can have any
+   number of recurrence rules specifying occurrences of the event, as well as
+   any number of recurrence rules specifying exceptions. */
+GArray*
+cal_obj_expand_recurrence		(CalObjTime	*event_start,
+					 CalObjTime	*event_end,
+					 Recurrence	*recur,
+					 CalObjTime	*interval_start,
+					 CalObjTime	*interval_end);
+
+END_GNOME_DECLS
+
+#endif