Add more weekday arithmetic functions.

These aren't as efficient as possible, but are as clear as possible.

New functions:

    e_weekday_add_days()
    e_weekday_subtract_days()
    e_weekday_get_days_between()

1 files changed, 6 insertions, 0 deletions

diff --git a/e-util/e-misc-utils.h b/e-util/e-misc-utils.h
index 282b1fda04..20a17b8add 100644
--- a/e-util/e-misc-utils.h
+++ b/e-util/e-misc-utils.h
@@ -141,6 +141,12 @@ const gchar *	e_get_weekday_name		(GDateWeekday weekday,
 						 gboolean abbreviated);
 GDateWeekday	e_weekday_get_next		(GDateWeekday weekday);
 GDateWeekday	e_weekday_get_prev		(GDateWeekday weekday);
+GDateWeekday	e_weekday_add_days		(GDateWeekday weekday,
+						 guint n_days);
+GDateWeekday	e_weekday_subtract_days		(GDateWeekday weekday,
+						 guint n_days);
+guint		e_weekday_get_days_between	(GDateWeekday weekday1,
+						 GDateWeekday weekday2);
 
 gboolean	e_file_lock_create		(void);
 void		e_file_lock_destroy		(void);