here is a patch for formatting.c (to_char/timestampt()), for 7.1

 it fixing Y,YY,YYY,YYYY conversion, the docs and regress tests update
 are included too.

  During the patch testing I found small bug in miscadmin.h in
convertstr() declaration. Here it's fixed too.

 Thanks

        Karel

doc/src/sgml/func.sgml

@@ -962,6 +962,20 @@
        keyword (example: <literal>'"Hello Year: "YYYY'</literal>).
       </para>
      </listitem>
+
+     <listitem>
+      <para>
+       <literal>YYYY</literal> conversion from string to timestamp or
+       date is limited if you use year great than 4-digits. You must
+       use after <literal>YYYY</literal> some non-digit char or template
+       else year is always interpreted as 4-digits. For example (with year
+       20000):
+       <literal> to_date('200001131', 'YYYYMMDD') <literal> will bad 
+       interpreded as 4-digits year, right is use after year non-digit 
+       separator <literal> to_date('20000-1131', 'YYYY-MMDD')<literal> or
+       <literal> to_date('20000Nov31', 'YYYYMonDD')<literal>.
+      </para>
+     </listitem>
     </itemizedlist>
    </para>
 

src/include/miscadmin.h

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: miscadmin.h,v 1.72 2000/11/21 21:16:04 petere Exp $
+ * $Id: miscadmin.h,v 1.73 2000/11/25 05:00:30 momjian Exp $
  *
  * NOTES
  *	  some of the information in this file will be moved to
@@ -142,7 +142,7 @@ extern int	FindExec(char *full_path, const char *argv0, const char *binary_name)
 extern int	CheckPathAccess(char *path, char *name, int open_mode);
 
 #ifdef CYR_RECODE
-extern char *convertstr(char *, int, int);
+extern char *convertstr(unsigned char *buff, int len, int dest);
 #endif
 
 /*****************************************************************************

src/test/regress/expected/timestamp.out

@@ -1560,9 +1560,9 @@ SELECT '' AS to_timestamp_5, to_timestamp('1,582nd VIII 21', 'Y,YYYth FMRM DD');
 
 SELECT '' AS to_timestamp_6, to_timestamp('15 "text bettween quote marks" 98 54 45', 
                     'HH "\\text bettween quote marks\\"" YY MI SS');
- to_timestamp_6 |       to_timestamp       
-----------------+--------------------------
-                | Wed Jan 01 15:54:45 0098
+ to_timestamp_6 |         to_timestamp         
+----------------+------------------------------
+                | Thu Jan 01 15:54:45 1998 PST
 (1 row)
 
     
@@ -1578,4 +1578,36 @@ SELECT '' AS to_timestamp_8, to_timestamp('2000January09Sunday', 'YYYYFMMonthDDF
                 | Sun Jan 09 00:00:00 2000 PST
 (1 row)
 
+SELECT '' AS to_timestamp_9, to_timestamp('97/Feb/16', 'YYMonDD');
+ERROR:  to_timestamp(): bad value for MON/Mon/mon
+SELECT '' AS to_timestamp_10, to_timestamp('19971116', 'YYYYMMDD');
+ to_timestamp_10 |         to_timestamp         
+-----------------+------------------------------
+                 | Sun Nov 16 00:00:00 1997 PST
+(1 row)
+
+SELECT '' AS to_timestamp_11, to_timestamp('20000-1116', 'YYYY-MMDD');
+ to_timestamp_11 |       to_timestamp        
+-----------------+---------------------------
+                 | Thu Nov 16 00:00:00 20000
+(1 row)
+
+SELECT '' AS to_timestamp_12, to_timestamp('9-1116', 'Y-MMDD');
+ to_timestamp_12 |         to_timestamp         
+-----------------+------------------------------
+                 | Mon Nov 16 00:00:00 2009 PST
+(1 row)
+
+SELECT '' AS to_timestamp_13, to_timestamp('95-1116', 'YY-MMDD');
+ to_timestamp_13 |         to_timestamp         
+-----------------+------------------------------
+                 | Thu Nov 16 00:00:00 1995 PST
+(1 row)
+
+SELECT '' AS to_timestamp_14, to_timestamp('995-1116', 'YYY-MMDD');
+ to_timestamp_14 |         to_timestamp         
+-----------------+------------------------------
+                 | Thu Nov 16 00:00:00 1995 PST
+(1 row)
+
 SET DateStyle TO DEFAULT;

src/test/regress/sql/timestamp.sql

@@ -223,4 +223,16 @@ SELECT '' AS to_timestamp_7, to_timestamp('05121445482000', 'MMDDHHMISSYYYY');
 
 SELECT '' AS to_timestamp_8, to_timestamp('2000January09Sunday', 'YYYYFMMonthDDFMDay');
 
+SELECT '' AS to_timestamp_9, to_timestamp('97/Feb/16', 'YYMonDD');
+
+SELECT '' AS to_timestamp_10, to_timestamp('19971116', 'YYYYMMDD');
+
+SELECT '' AS to_timestamp_11, to_timestamp('20000-1116', 'YYYY-MMDD');
+
+SELECT '' AS to_timestamp_12, to_timestamp('9-1116', 'Y-MMDD');
+
+SELECT '' AS to_timestamp_13, to_timestamp('95-1116', 'YY-MMDD');
+
+SELECT '' AS to_timestamp_14, to_timestamp('995-1116', 'YYY-MMDD');
+
 SET DateStyle TO DEFAULT;