diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index d2678f06..0c340a76 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -332,18 +332,6 @@ void
 _notmuch_message_add_reply (notmuch_message_t *message,
 			    notmuch_message_node_t *reply);
 
-/* date.c */
-
-/* Parse an RFC 8222 date string to a time_t value.
- *
- * The tz_offset argument can be used to also obtain the time-zone
- * offset, (but can be NULL if the call is not interested in that).
- *
- * Returns 0 on error.
- */
-time_t
-notmuch_parse_date (const char *str, int *tz_offset);
-
 /* sha1.c */
 
 char *