Feature: NewGRF string codes for 0-based dates.

diff -r acfd32f81907 src/newgrf_text.cpp
--- a/src/newgrf_text.cpp	Sat Aug 20 15:11:18 2011 +0200
+++ b/src/newgrf_text.cpp	Sat Aug 20 15:11:53 2011 +0200
@@ -567,6 +567,9 @@
 						}
 						break;
 
+					case 0x16:
+					case 0x17: d += Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD_DATE + code - 0x16); break;
+
 					default:
 						grfmsg(1, "missing handler for extended format code");
 						break;
@@ -1017,7 +1020,6 @@
 			case SCC_NEWGRF_PRINT_DWORD:           *argv = _newgrf_textrefstack.PopSignedDWord();   break;
 
 			case SCC_NEWGRF_PRINT_HEX_BYTE:        *argv = _newgrf_textrefstack.PopUnsignedByte();  break;
-			case SCC_NEWGRF_PRINT_HEX_DWORD:       *argv = _newgrf_textrefstack.PopUnsignedDWord(); break;
 			case SCC_NEWGRF_PRINT_HEX_QWORD:       *argv = _newgrf_textrefstack.PopSignedQWord(); break;
 
 			case SCC_NEWGRF_PRINT_HEX_WORD:
@@ -1030,6 +1032,10 @@
 			case SCC_NEWGRF_PRINT_WORD_DATE:
 			case SCC_NEWGRF_PRINT_WORD_MONTH_YEAR: *argv = _newgrf_textrefstack.PopUnsignedWord() + DAYS_TILL_ORIGINAL_BASE_YEAR; break;
 
+			case SCC_NEWGRF_PRINT_DWORD_DATE:
+			case SCC_NEWGRF_PRINT_DWORD_MONTH_YEAR:
+			case SCC_NEWGRF_PRINT_HEX_DWORD:       *argv = _newgrf_textrefstack.PopUnsignedDWord(); break;
+
 			case SCC_NEWGRF_DISCARD_WORD:          _newgrf_textrefstack.PopUnsignedWord(); break;
 
 			case SCC_NEWGRF_ROTATE_TOP_4_WORDS:    _newgrf_textrefstack.RotateTop4Words(); break;
@@ -1064,9 +1070,11 @@
 			return SCC_NEWGRF_PRINT_STRING_ID;
 
 		case SCC_NEWGRF_PRINT_WORD_DATE:
+		case SCC_NEWGRF_PRINT_DWORD_DATE:
 			return SCC_DATE_LONG;
 
 		case SCC_NEWGRF_PRINT_WORD_MONTH_YEAR:
+		case SCC_NEWGRF_PRINT_DWORD_MONTH_YEAR:
 			return SCC_DATE_SHORT;
 
 		case SCC_NEWGRF_PRINT_WORD_SPEED:
diff -r acfd32f81907 src/table/control_codes.h
--- a/src/table/control_codes.h	Sat Aug 20 15:11:18 2011 +0200
+++ b/src/table/control_codes.h	Sat Aug 20 15:11:53 2011 +0200
@@ -118,6 +118,8 @@
 	SCC_NEWGRF_PRINT_UNSIGNED_WORD,            ///< Read 2 bytes from the stack as unsigned value
 	SCC_NEWGRF_PRINT_DWORD_CURRENCY,           ///< Read 4 bytes from the stack as currency
 	SCC_NEWGRF_PRINT_STRING_ID,                ///< Read 2 bytes from the stack as String ID
+	SCC_NEWGRF_PRINT_DWORD_DATE,               ///< Read 4 bytes from the stack as base 0 date
+	SCC_NEWGRF_PRINT_DWORD_MONTH_YEAR,         ///< Read 4 bytes from the stack as base 0 date
 	SCC_NEWGRF_PRINT_WORD_DATE,                ///< Read 2 bytes from the stack as base 1920 date
 	SCC_NEWGRF_PRINT_WORD_MONTH_YEAR,          ///< Read 2 bytes from the stack as base 1920 date
 	SCC_NEWGRF_PRINT_WORD_SPEED,               ///< Read 2 bytes from the stack as signed speed