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diff --git a/calendar/cal-util/timeutil.h b/calendar/cal-util/timeutil.h
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+/* Miscellaneous time-related utilities
+ *
+ * Copyright (C) 1998 The Free Software Foundation
+ *
+ * Authors: Federico Mena <federico@nuclecu.unam.mx>
+ *          Miguel de Icaza <miguel@nuclecu.unam.mx>
+ */
+
+#ifndef TIMEUTIL_H
+#define TIMEUTIL_H
+
+
+#include <time.h>
+
+
+time_t time_from_isodate        (char *str);
+time_t time_from_start_duration (time_t start, char *duration);
+char   *isodate_from_time_t     (time_t t);
+int    get_time_t_hour          (time_t t);
+int    isodiff_to_secs          (char *str);
+char   *isodiff_from_secs       (int secs);
+
+time_t time_add_minutes (time_t time, int minutes);
+time_t time_add_day (time_t time, int days);
+time_t time_add_week (time_t time, int weeks);
+time_t time_add_month (time_t time, int months);
+time_t time_add_year (time_t time, int years);
+
+
+/* Returns pointer to a statically-allocated buffer with a string of the form
+ * 3am, 4am, 12pm, 08h, 17h, etc.
+ * The string is internationalized, hopefully correctly.
+ */
+char *format_simple_hour (int hour, int use_am_pm);
+
+/* Returns the number of days in the specified month.  Years are full years (starting from year 1).
+ * Months are in [0, 11].
+ */
+int time_days_in_month (int year, int month);
+
+/* Converts the specified date to a time_t at the start of the specified day.  Years are full years
+ * (starting from year 1).  Months are in [0, 11].  Days are 1-based.
+ */
+time_t time_from_day (int year, int month, int day);
+
+time_t time_day_hour     (time_t t, int hour);
+
+/* For the functions below, time ranges are considered to contain the start time, but not the end
+ * time.
+ */
+
+/* These two functions take a time value and return the beginning or end of the corresponding year,
+ * respectively.
+ */
+time_t time_year_begin (time_t t);
+time_t time_year_end (time_t t);
+
+/* These two functions take a time value and return the beginning or end of the corresponding month,
+ * respectively.
+ */
+time_t time_month_begin (time_t t);
+time_t time_month_end (time_t t);
+
+/* These functions take a time value and return the beginning or end of the corresponding week,
+ * respectively.  This takes into account the global week_starts_on_monday flag.
+ */
+time_t time_week_begin (time_t t);
+time_t time_week_end (time_t t);
+
+/* These two functions take a time value and return the beginning or end of the corresponding day,
+ * respectively.
+ */
+time_t time_day_begin (time_t t);
+time_t time_day_end (time_t t);
+
+
+time_t parse_date (char *str);
+void print_time_t (time_t t);
+
+
+#endif