Import departure boards patch

src/date_func.h

@@ -24,6 +24,8 @@ void SetDate(Date date, DateFract fract);
 void ConvertDateToYMD(Date date, YearMonthDay *ymd);
 Date ConvertYMDToDate(Year year, Month month, Day day);
 
+#define YMD_TO_DATE(ymd) (ConvertYMDToDate(ymd.year, ymd.month, ymd.day))
+
 /**
  * Checks whether the given year is a leap year or not.
  * @param yr The year to check.