> > I have no idea if this in Oracle or not. But it's something I

> > needed, and other people in the past asked about it too.
>
> It is in Oracle, but you aren't exactly on the spot.  It should be
>
> IYYY - 4 digits  ('2003')
> IYY  - 3 digits  ('003')
> IY   - 2 digits  ('03')
> I    - 1 digit   ('3')

Here is an updated patch that does that.

Kurt Roeckx

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 16ed17b118ab0bdf92292a03209192fd157b4809..c7c0f23c8faf33d4e4f0c80fda3f7c4838101561 100644 (file)
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -1,5 +1,5 @@
 
 
@@ -3983,6 +3983,22 @@ substring('foobar' from 'o(.)b')   o
    Y
    last digit of year
        
+       
+   IYYY
+   ISO year (4 and more digits)
+       
+       
+   IYY
+   last 3 digits of ISO year
+       
+       
+   IY
+   last 2 digits of ISO year
+       
+       
+   I
+   last digits of ISO year
+       
        
    BC or B.C. or
    AD or A.D.

diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
index 0f5487dbb779b8ba83b9dc2121d1cc2cb976d383..d808ac90e25d66b8754cc1044824d64faa241976 100644 (file)
--- a/src/backend/utils/adt/formatting.c
+++ b/src/backend/utils/adt/formatting.c
@@ -1,7 +1,7 @@
 /* -----------------------------------------------------------------------
  * formatting.c
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.70 2003/11/29 19:51:58 pgsql Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.71 2003/12/25 03:36:23 momjian Exp $
  *
  *
  *  Portions Copyright (c) 1999-2003, PostgreSQL Global Development Group
@@ -525,6 +525,10 @@ typedef enum
    DCH_HH12,
    DCH_HH,
    DCH_IW,
+   DCH_IYYY,
+   DCH_IYY,
+   DCH_IY,
+   DCH_I,
    DCH_J,
    DCH_MI,
    DCH_MM,
@@ -565,6 +569,10 @@ typedef enum
    DCH_hh12,
    DCH_hh,
    DCH_iw,
+   DCH_iyyy,
+   DCH_iyy,
+   DCH_iy,
+   DCH_i,
    DCH_j,
    DCH_mi,
    DCH_mm,
@@ -659,6 +667,10 @@ static KeyWord DCH_keywords[] = {
    {"HH12", 4, dch_time, DCH_HH12, TRUE},
    {"HH", 2, dch_time, DCH_HH, TRUE},
    {"IW", 2, dch_date, DCH_IW, TRUE},  /* I */
+   {"IYYY", 4, dch_date, DCH_IYYY, TRUE},
+   {"IYY", 3, dch_date, DCH_IYY, TRUE},
+   {"IY", 2, dch_date, DCH_IY, TRUE},
+   {"I", 1, dch_date, DCH_I, TRUE},
    {"J", 1, dch_date, DCH_J, TRUE},    /* J */
    {"MI", 2, dch_time, DCH_MI, TRUE},
    {"MM", 2, dch_date, DCH_MM, TRUE},
@@ -699,6 +711,10 @@ static KeyWord DCH_keywords[] = {
    {"hh12", 4, dch_time, DCH_HH12, TRUE},
    {"hh", 2, dch_time, DCH_HH, TRUE},
    {"iw", 2, dch_date, DCH_IW, TRUE},  /* i */
+   {"iyyy", 4, dch_date, DCH_IYYY, TRUE},
+   {"iyy", 3, dch_date, DCH_IYY, TRUE},
+   {"iy", 2, dch_date, DCH_IY, TRUE},
+   {"i", 1, dch_date, DCH_I, TRUE},
    {"j", 1, dch_time, DCH_J, TRUE},    /* j */
    {"mi", 2, dch_time, DCH_MI, TRUE},  /* m */
    {"mm", 2, dch_date, DCH_MM, TRUE},
@@ -2447,12 +2463,26 @@ dch_date(int arg, char *inout, int suf, int flag, FormatNode *node, void *data)
            }
            break;
        case DCH_YYYY:
+       case DCH_IYYY:
            if (flag == TO_CHAR)
            {
                if (tm->tm_year <= 9999 && tm->tm_year >= -9998)
-                   sprintf(inout, "%0*d", S_FM(suf) ? 0 : 4, YEAR_ABS(tm->tm_year));
+                   sprintf(inout, "%0*d",
+                       S_FM(suf) ? 0 : 4,
+                       arg == DCH_YYYY ?
+                       YEAR_ABS(tm->tm_year) :
+                       YEAR_ABS(date2isoyear(
+                           tm->tm_year,
+                           tm->tm_mon,
+                           tm->tm_mday)));
                else
-                   sprintf(inout, "%d", YEAR_ABS(tm->tm_year));
+                   sprintf(inout, "%d",
+                       arg == DCH_YYYY ?
+                       YEAR_ABS(tm->tm_year) :
+                       YEAR_ABS(date2isoyear(
+                           tm->tm_year,
+                           tm->tm_mon,
+                           tm->tm_mday)));
                if (S_THth(suf))
                    str_numth(p_inout, inout, S_TH_TYPE(suf));
                return strlen(p_inout) - 1;
@@ -2472,9 +2502,14 @@ dch_date(int arg, char *inout, int suf, int flag, FormatNode *node, void *data)
            }
            break;
        case DCH_YYY:
+       case DCH_IYY:
            if (flag == TO_CHAR)
            {
-               snprintf(buff, sizeof(buff), "%03d", YEAR_ABS(tm->tm_year));
+               snprintf(buff, sizeof(buff), "%03d",
+                   arg == DCH_YYY ?
+                   YEAR_ABS(tm->tm_year) :
+                   YEAR_ABS(date2isoyear(tm->tm_year,
+                       tm->tm_mon, tm->tm_mday)));
                i = strlen(buff);
                strcpy(inout, buff + (i - 3));
                if (S_THth(suf))
@@ -2502,9 +2537,14 @@ dch_date(int arg, char *inout, int suf, int flag, FormatNode *node, void *data)
            }
            break;
        case DCH_YY:
+       case DCH_IY:
            if (flag == TO_CHAR)
            {
-               snprintf(buff, sizeof(buff), "%02d", YEAR_ABS(tm->tm_year));
+               snprintf(buff, sizeof(buff), "%02d",
+                   arg == DCH_YY ?
+                   YEAR_ABS(tm->tm_year) :
+                   YEAR_ABS(date2isoyear(tm->tm_year,
+                       tm->tm_mon, tm->tm_mday)));
                i = strlen(buff);
                strcpy(inout, buff + (i - 2));
                if (S_THth(suf))
@@ -2532,9 +2572,14 @@ dch_date(int arg, char *inout, int suf, int flag, FormatNode *node, void *data)
            }
            break;
        case DCH_Y:
+       case DCH_I:
            if (flag == TO_CHAR)
            {
-               snprintf(buff, sizeof(buff), "%1d", YEAR_ABS(tm->tm_year));
+               snprintf(buff, sizeof(buff), "%1d",
+                   arg == DCH_Y ?
+                   YEAR_ABS(tm->tm_year) :
+                   YEAR_ABS(date2isoyear(tm->tm_year,
+                       tm->tm_mon, tm->tm_mday)));
                i = strlen(buff);
                strcpy(inout, buff + (i - 1));
                if (S_THth(suf))

diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index 5cd5b92f59754c0dc0248bcb7c78c92ce7f112f6..7aab2455a268f933e719b7d90c5ced7a05b43df5 100644 (file)
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *   $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.97 2003/11/29 19:51:59 pgsql Exp $
+ *   $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.98 2003/12/25 03:36:23 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2840,7 +2840,7 @@ interval_trunc(PG_FUNCTION_ARGS)
 
 /* isoweek2date()
  * Convert ISO week of year number to date.
- * The year field must be specified!
+ * The year field must be specified with the ISO year!
  * karel 2000/08/07
  */
 void
@@ -2920,6 +2920,64 @@ date2isoweek(int year, int mon, int mday)
 }
 
 
+/* date2isoyear()
+ *
+ * Returns ISO 8601 year number.
+ */
+int
+date2isoyear(int year, int mon, int mday)
+{
+   float8  result;
+   int day0,
+       day4,
+       dayn;
+
+   /* current day */
+   dayn = date2j(year, mon, mday);
+
+   /* fourth day of current year */
+   day4 = date2j(year, 1, 4);
+
+   /* day0 == offset to first day of week (Monday) */
+   day0 = j2day(day4 - 1);
+
+   /*
+    * We need the first week containing a Thursday, otherwise this day
+    * falls into the previous year for purposes of counting weeks
+    */
+   if (dayn < (day4 - day0))
+   {
+       day4 = date2j(year - 1, 1, 4);
+
+       /* day0 == offset to first day of week (Monday) */
+       day0 = j2day(day4 - 1);
+
+       year--;
+   }
+
+   result = (((dayn - (day4 - day0)) / 7) + 1);
+
+   /*
+    * Sometimes the last few days in a year will fall into the first week
+    * of the next year, so check for this.
+    */
+   if (result >= 53)
+   {
+       day4 = date2j(year + 1, 1, 4);
+
+       /* day0 == offset to first day of week (Monday) */
+       day0 = j2day(day4 - 1);
+
+       if (dayn >= (day4 - day0))
+       {
+           year++;
+       }
+   }
+
+   return year;
+}
+
+
 /* timestamp_part()
  * Extract specified field from timestamp.
  */

diff --git a/src/include/utils/timestamp.h b/src/include/utils/timestamp.h
index 2e20298a77bebd62dbcbe5c60521a3a0a82fa8d3..d70a6f1833f0aacc0e03a2e96a3463e330061595 100644 (file)
--- a/src/include/utils/timestamp.h
+++ b/src/include/utils/timestamp.h
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.32 2003/11/29 22:41:16 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.33 2003/12/25 03:36:24 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -248,5 +248,6 @@ extern void GetEpochTime(struct tm * tm);
 
 extern void isoweek2date(int woy, int *year, int *mon, int *mday);
 extern int date2isoweek(int year, int mon, int mday);
+extern int date2isoyear(int year, int mon, int mday);
 
 #endif   /* TIMESTAMP_H */

diff --git a/src/test/regress/expected/timestamptz.out b/src/test/regress/expected/timestamptz.out
index 3453c49d775419918ea1a05800ab2c36697b7bec..a76e09a0f544be3bac2a994d4db161f836a41fa9 100644 (file)
--- a/src/test/regress/expected/timestamptz.out
+++ b/src/test/regress/expected/timestamptz.out
@@ -1317,6 +1317,76 @@ SELECT '' AS to_char_9, to_char(d1, 'YYYY A.D. YYYY a.d. YYYY bc HH:MI:SS P.M. H
            | 2001 A.D. 2001 a.d. 2001 ad 05:32:01 P.M. 05:32:01 p.m. 05:32:01 pm
 (64 rows)
 
+SELECT '' AS to_char_10, to_char(d1, 'YYYY WW IYYY IYY IY I IW')
+   FROM TIMESTAMPTZ_TBL;
+ to_char_10 |     to_char
+------------+--------------------------
+            | 
+            | 
+            | 1969 53 1970 970 70 0 01
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 01 1997 997 97 7 01
+            | 1997 01 1997 997 97 7 01
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 23 1997 997 97 7 24
+            | 2001 38 2001 001 01 1 38
+            | 2000 11 2000 000 00 0 11
+            | 2000 11 2000 000 00 0 11
+            | 2000 11 2000 000 00 0 11
+            | 2000 11 2000 000 00 0 11
+            | 2000 11 2000 000 00 0 11
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 23 1997 997 97 7 24
+            | 1997 06 1997 997 97 7 07
+            | 1997 06 1997 997 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 0097 07 0097 097 97 7 07
+            | 0097 07 0097 097 97 7 07
+            | 0597 07 0597 597 97 7 07
+            | 1097 07 1097 097 97 7 07
+            | 1697 07 1697 697 97 7 07
+            | 1797 07 1797 797 97 7 07
+            | 1897 07 1897 897 97 7 07
+            | 1997 07 1997 997 97 7 07
+            | 2097 07 2097 097 97 7 07
+            | 1996 09 1996 996 96 6 09
+            | 1996 09 1996 996 96 6 09
+            | 1996 09 1996 996 96 6 09
+            | 1996 53 1997 997 97 7 01
+            | 1996 53 1997 997 97 7 01
+            | 1997 01 1997 997 97 7 01
+            | 1997 09 1997 997 97 7 09
+            | 1997 09 1997 997 97 7 09
+            | 1997 52 1998 998 98 8 01
+            | 1997 53 1998 998 98 8 01
+            | 1999 53 1999 999 99 9 52
+            | 2000 01 1999 999 99 9 52
+            | 2000 53 2000 000 00 0 52
+            | 2001 01 2001 001 01 1 01
+(64 rows)
+
 -- TO_TIMESTAMP()
 SELECT '' AS to_timestamp_1, to_timestamp('0097/Feb/16 --> 08:14:30', 'YYYY/Mon/DD --> HH:MI:SS');
  to_timestamp_1 |       to_timestamp       
@@ -1402,4 +1472,16 @@ SELECT '' AS to_timestamp_14, to_timestamp('995-1116', 'YYY-MMDD');
                  | Thu Nov 16 00:00:00 1995 PST
 (1 row)
 
+SELECT '' AS to_timestamp_15, to_timestamp('200401', 'IYYYIW');
+ to_timestamp_15 |         to_timestamp         
+-----------------+------------------------------
+                 | Mon Dec 29 00:00:00 2003 PST
+(1 row)
+
+SELECT '' AS to_timestamp_16, to_timestamp('200401', 'YYYYWW');
+ to_timestamp_16 |         to_timestamp         
+-----------------+------------------------------
+                 | Thu Jan 01 00:00:00 2004 PST
+(1 row)
+
 SET DateStyle TO DEFAULT;

diff --git a/src/test/regress/sql/timestamptz.sql b/src/test/regress/sql/timestamptz.sql
index 71414f198e16047dcaa5444c800efb7bd7c212be..2a789b87bd259f9e4f6c2f422a78a5fa2759517d 100644 (file)
--- a/src/test/regress/sql/timestamptz.sql
+++ b/src/test/regress/sql/timestamptz.sql
@@ -189,6 +189,9 @@ SELECT '' AS to_char_8, to_char(d1, 'YYYYTH YYYYth Jth')
 SELECT '' AS to_char_9, to_char(d1, 'YYYY A.D. YYYY a.d. YYYY bc HH:MI:SS P.M. HH:MI:SS p.m. HH:MI:SS pm') 
    FROM TIMESTAMPTZ_TBL;   
 
+SELECT '' AS to_char_10, to_char(d1, 'YYYY WW IYYY IYY IY I IW') 
+   FROM TIMESTAMPTZ_TBL;
+
 -- TO_TIMESTAMP()
 SELECT '' AS to_timestamp_1, to_timestamp('0097/Feb/16 --> 08:14:30', 'YYYY/Mon/DD --> HH:MI:SS');
    
@@ -220,4 +223,9 @@ SELECT '' AS to_timestamp_13, to_timestamp('95-1116', 'YY-MMDD');
 
 SELECT '' AS to_timestamp_14, to_timestamp('995-1116', 'YYY-MMDD');
 
+SELECT '' AS to_timestamp_15, to_timestamp('200401', 'IYYYIW');
+
+SELECT '' AS to_timestamp_16, to_timestamp('200401', 'YYYYWW');
+
+
 SET DateStyle TO DEFAULT;