(svn r20592) -Fix (r2041): no (proper) savegame conversion was done when _date_fract got a new value range

src/date.cpp

@@ -34,6 +34,8 @@ uint16 _tick_counter;  ///< Ever incrementing (and sometimes wrapping) tick coun
  */
 void SetDate(Date date, DateFract fract)
 {
+	assert(fract < DAY_TICKS);
+
 	YearMonthDay ymd;
 
 	_date = date;

src/saveload/afterload.cpp

@@ -569,6 +569,9 @@ bool AfterLoadGame()
 		default: break;
 	}
 
+	/* The value of _date_fract got divided, so make sure that old games are converted correctly. */
+	if (CheckSavegameVersionOldStyle(11, 1)) _date_fract /= 885;
+
 	/* Update current year
 	 * must be done before loading sprites as some newgrfs check it */
 	SetDate(_date, _date_fract);