--- a/src/date_type.h	Fri Jun 20 20:40:47 2008 +0000
+++ b/src/date_type.h	Fri Jun 20 21:14:10 2008 +0000
@@ -46,8 +46,8 @@
 
 struct YearMonthDay {
 	Year  year;
-	Month month;
-	Day   day;
+	Month month; ///< 0 - 11
+	Day   day;   ///< 1 - 31
 };
 
 static const Year INVALID_YEAR = -1;