--- a/currency.c	Wed Aug 16 17:58:43 2006 +0000
+++ b/currency.c	Thu Aug 17 20:22:35 2006 +0000
@@ -79,7 +79,7 @@
 	uint i;
 
 	for (i = 0; i != lengthof(_currency_specs); i++) {
-		uint16 to_euro = _currency_specs[i].to_euro;
+		Year to_euro = _currency_specs[i].to_euro;
 
 		if (to_euro != CF_NOEURO && to_euro != CF_ISEURO && _cur_year >= to_euro) continue;
 		if (to_euro == CF_ISEURO && _cur_year < 2000) continue;

--- a/currency.h	Wed Aug 16 17:58:43 2006 +0000
+++ b/currency.h	Thu Aug 17 20:22:35 2006 +0000
@@ -11,7 +11,7 @@
 typedef struct {
 	uint16 rate;
 	char separator;
-	uint16 to_euro;
+	Year to_euro;
 	char prefix[16];
 	char suffix[16];
 } CurrencySpec;

--- a/depot.h	Wed Aug 16 17:58:43 2006 +0000
+++ b/depot.h	Thu Aug 17 20:22:35 2006 +0000
@@ -53,7 +53,7 @@
  * within the given bounds. @see MIN_SERVINT_PERCENT ,etc.
  * @param index proposed service interval
  */
-static inline uint16 GetServiceIntervalClamped(uint index)
+static inline Date GetServiceIntervalClamped(uint index)
 {
 	return (_patches.servint_ispercent) ? clamp(index, MIN_SERVINT_PERCENT, MAX_SERVINT_PERCENT) : clamp(index, MIN_SERVINT_DAYS, MAX_SERVINT_DAYS);
 }

--- a/engine.c	Wed Aug 16 17:58:43 2006 +0000
+++ b/engine.c	Thu Aug 17 20:22:35 2006 +0000
@@ -88,11 +88,10 @@
 
 static void AdjustAvailAircraft(void)
 {
-	uint16 date = _date;
 	byte avail = 0;
-	if (date >= 12784) avail |= 2; // big airport
-	if (date < 14610 || _patches.always_small_airport) avail |= 1;  // small airport
-	if (date >= 15706) avail |= 4; // enable heliport
+	if (_cur_year >= 1955) avail |= 2; // big airport
+	if (_cur_year <  1960 || _patches.always_small_airport) avail |= 1;  // small airport
+	if (_cur_year >= 1963) avail |= 4; // enable heliport
 
 	if (avail != _avail_aircraft) {
 		_avail_aircraft = avail;
@@ -151,7 +150,7 @@
 		// base intro date is before 1922 then the random number of days is not
 		// added.
 		r = Random();
-		e->intro_date = ei->base_intro <= 729 ? ei->base_intro : GB(r, 0, 9) + ei->base_intro;
+		e->intro_date = ei->base_intro <= ConvertYMDToDate(1922, 0, 1) ? ei->base_intro : (Date)GB(r, 0, 9) + ei->base_intro;
 		if (e->intro_date <= _date) {
 			e->age = (_date - e->intro_date) >> 5;
 			e->player_avail = (byte)-1;

--- a/industry_cmd.c	Wed Aug 16 17:58:43 2006 +0000
+++ b/industry_cmd.c	Thu Aug 17 20:22:35 2006 +0000
@@ -1647,8 +1647,8 @@
 
 	type = _new_industry_rand[_opt.landscape][GB(r, 16, 5)];
 
-	if (type == IT_OIL_WELL && _date > 10958) return;
-	if (type == IT_OIL_RIG  && _date < 14610) return;
+	if (type == IT_OIL_WELL && _cur_year > 1950) return;
+	if (type == IT_OIL_RIG  && _cur_year < 1960) return;
 
 	j = 2000;
 	for (;;) {

--- a/newgrf.c	Wed Aug 16 17:58:43 2006 +0000
+++ b/newgrf.c	Thu Aug 17 20:22:35 2006 +0000
@@ -1060,10 +1060,6 @@
 			FOR_EACH_OBJECT _bridge[brid + i].flags = grf_load_byte(&buf);
 			break;
 
-		case 0x0F: /* Long year -- must be set after property 8 */
-			FOR_EACH_OBJECT _bridge[brid + i].avail_year = grf_load_word(&buf);
-			break;
-
 		default:
 			ret = true;
 	}

--- a/openttd.h	Wed Aug 16 17:58:43 2006 +0000
+++ b/openttd.h	Thu Aug 17 20:22:35 2006 +0000
@@ -267,7 +267,7 @@
 typedef struct TileDesc {
 	StringID str;
 	byte owner;
-	uint16 build_date;
+	Date build_date;
 	uint32 dparam[2];
 } TileDesc;
 

--- a/yapf/yapf_costcache.hpp	Wed Aug 16 17:58:43 2006 +0000
+++ b/yapf/yapf_costcache.hpp	Thu Aug 17 20:22:35 2006 +0000
@@ -148,11 +148,11 @@
 	FORCEINLINE static Cache& stGetGlobalCache()
 	{
 		static int last_rail_change_counter = 0;
-		static uint32 last_day = 0;
+		static Date last_date = 0;
 
 		// some statistics
-		if (last_day != _date) {
-			last_day = _date;
+		if (last_date != _date) {
+			last_date = _date;
 			DEBUG(yapf, 1)("pf time today:%5d ms\n", _total_pf_time_us / 1000);
 			_total_pf_time_us = 0;
 		}