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Fix handling of CC (century) format spec in to_date/to_char. According to 

standard convention the 21st century runs from 2001-2100, not 2000-2099,
so make it work like that.  Per bug #2885 from Akio Iwaasa.

Backpatch to 8.2, but no further, since this is really a definitional
change; users of older branches are probably more interested in stability.
This commit is contained in:
Tom Lane 2007-01-12 23:34:55 +00:00
parent 113fbe1264
commit 9a54b76b39
4 changed files with 51 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
doc/src/sgml/func.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.349 2007/01/12 20:06:10 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.350 2007/01/12 23:34:54 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -4617,7 +4617,7 @@ SELECT SUBSTRING('XY1234Z', 'Y*?([0-9]{1,3})');
</row>
<row>
<entry><literal>CC</literal></entry>
<entry>century component of year (minimum 2 digits)</entry>
<entry>century (2 digits) (The twenty-first century starts on 2001-01-01.)</entry>
</row>
<row>
<entry><literal>J</literal></entry>

39
src/backend/utils/adt/formatting.c
View File

@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------
* formatting.c
*
* $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.117 2007/01/05 22:19:40 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/formatting.c,v 1.118 2007/01/12 23:34:54 tgl Exp $
*
*
* Portions Copyright (c) 1999-2007, PostgreSQL Global Development Group
@ -2445,7 +2445,10 @@ dch_date(int arg, char *inout, int suf, bool is_to_char, bool is_interval,
case DCH_CC:
if (is_to_char)
{
i = tm->tm_year / 100 + ((is_interval) ? 0 : 1);
if (is_interval) /* straight calculation */
i = tm->tm_year / 100;
else /* century 21 starts in 2001 */
i = (tm->tm_year - 1) / 100 + 1;
if (i <= 99 && i >= -99)
sprintf(inout, "%0*d", S_FM(suf) ? 0 : 2, i);
else
@ -3295,9 +3298,6 @@ do_to_timestamp(text *date_txt, text *fmt,
tm->tm_sec = x;
}
if (tmfc.cc)
tm->tm_year = (tmfc.cc - 1) * 100;
if (tmfc.ww)
tmfc.ddd = (tmfc.ww - 1) * 7 + 1;
@ -3347,24 +3347,27 @@ do_to_timestamp(text *date_txt, text *fmt,
if (tmfc.year)
{
if (tmfc.yysz == 2 && tmfc.cc)
/*
* If CC and YY (or Y) are provided, use YY as 2 low-order digits
* for the year in the given century. Keep in mind that the 21st
* century runs from 2001-2100, not 2000-2099.
*
* If a 4-digit year is provided, we use that and ignore CC.
*/
if (tmfc.cc && tmfc.yysz <= 2)
{
/*
* CC and YY defined why -[2000|1900]? See dch_date() DCH_YY code.
*/
tm->tm_year = (tmfc.cc - 1) * 100 + (tmfc.year >= 2000 ? tmfc.year - 2000 : tmfc.year - 1900);
}
else if (tmfc.yysz == 1 && tmfc.cc)
{
/*
* CC and Y defined
*/
tm->tm_year = (tmfc.cc - 1) * 100 + tmfc.year - 2000;
tm->tm_year = tmfc.year % 100;
if (tm->tm_year)
tm->tm_year += (tmfc.cc - 1) * 100;
else
tm->tm_year = tmfc.cc * 100;
}
else
/* set year (and ignore CC if defined) */
tm->tm_year = tmfc.year;
}
else if (tmfc.cc) /* use first year of century */
tm->tm_year = (tmfc.cc - 1) * 100 + 1;
if (tmfc.bc)
{
if (tm->tm_year > 0)

28
src/test/regress/expected/timestamp.out
View File

@ -867,11 +867,11 @@ SELECT '' AS to_char_3, to_char(d1, 'Y,YYY YYYY YYY YY Y CC Q MM WW DDD DD D J')
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 2 06 23 161 10 3 2450610
| 2,001 2001 001 01 1 21 3 09 38 265 22 7 2452175
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
@ -912,8 +912,8 @@ SELECT '' AS to_char_3, to_char(d1, 'Y,YYY YYYY YYY YY Y CC Q MM WW DDD DD D J')
| 1,997 1997 997 97 7 20 4 12 52 364 30 3 2450813
| 1,997 1997 997 97 7 20 4 12 53 365 31 4 2450814
| 1,999 1999 999 99 9 20 4 12 53 365 31 6 2451544
| 2,000 2000 000 00 0 21 1 01 01 001 01 7 2451545
| 2,000 2000 000 00 0 21 4 12 53 366 31 1 2451910
| 2,000 2000 000 00 0 20 1 01 01 001 01 7 2451545
| 2,000 2000 000 00 0 20 4 12 53 366 31 1 2451910
| 2,001 2001 001 01 1 21 1 01 01 001 01 2 2451911
(65 rows)
@ -938,11 +938,11 @@ SELECT '' AS to_char_4, to_char(d1, 'FMY,YYY FMYYYY FMYYY FMYY FMY FMCC FMQ FMMM
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 2 6 23 161 10 3 2450610
| 2,001 2001 001 01 1 21 3 9 38 265 22 7 2452175
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
@ -983,8 +983,8 @@ SELECT '' AS to_char_4, to_char(d1, 'FMY,YYY FMYYYY FMYYY FMYY FMY FMCC FMQ FMMM
| 1,997 1997 997 97 7 20 4 12 52 364 30 3 2450813
| 1,997 1997 997 97 7 20 4 12 53 365 31 4 2450814
| 1,999 1999 999 99 9 20 4 12 53 365 31 6 2451544
| 2,000 2000 000 00 0 21 1 1 1 1 1 7 2451545
| 2,000 2000 000 00 0 21 4 12 53 366 31 1 2451910
| 2,000 2000 000 00 0 20 1 1 1 1 1 7 2451545
| 2,000 2000 000 00 0 20 4 12 53 366 31 1 2451910
| 2,001 2001 001 01 1 21 1 1 1 1 1 2 2451911
(65 rows)

28
src/test/regress/expected/timestamptz.out
View File

@ -887,11 +887,11 @@ SELECT '' AS to_char_3, to_char(d1, 'Y,YYY YYYY YYY YY Y CC Q MM WW DDD DD D J')
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 2 06 23 161 10 3 2450610
| 2,001 2001 001 01 1 21 3 09 38 265 22 7 2452175
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 21 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 2,000 2000 000 00 0 20 1 03 11 075 15 4 2451619
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
| 1,997 1997 997 97 7 20 1 02 06 041 10 2 2450490
@ -933,8 +933,8 @@ SELECT '' AS to_char_3, to_char(d1, 'Y,YYY YYYY YYY YY Y CC Q MM WW DDD DD D J')
| 1,997 1997 997 97 7 20 4 12 52 364 30 3 2450813
| 1,997 1997 997 97 7 20 4 12 53 365 31 4 2450814
| 1,999 1999 999 99 9 20 4 12 53 365 31 6 2451544
| 2,000 2000 000 00 0 21 1 01 01 001 01 7 2451545
| 2,000 2000 000 00 0 21 4 12 53 366 31 1 2451910
| 2,000 2000 000 00 0 20 1 01 01 001 01 7 2451545
| 2,000 2000 000 00 0 20 4 12 53 366 31 1 2451910
| 2,001 2001 001 01 1 21 1 01 01 001 01 2 2451911
(66 rows)
@ -960,11 +960,11 @@ SELECT '' AS to_char_4, to_char(d1, 'FMY,YYY FMYYYY FMYYY FMYY FMY FMCC FMQ FMMM
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 2 6 23 161 10 3 2450610
| 2,001 2001 001 01 1 21 3 9 38 265 22 7 2452175
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 21 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 2,000 2000 000 00 0 20 1 3 11 75 15 4 2451619
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
| 1,997 1997 997 97 7 20 1 2 6 41 10 2 2450490
@ -1006,8 +1006,8 @@ SELECT '' AS to_char_4, to_char(d1, 'FMY,YYY FMYYYY FMYYY FMYY FMY FMCC FMQ FMMM
| 1,997 1997 997 97 7 20 4 12 52 364 30 3 2450813
| 1,997 1997 997 97 7 20 4 12 53 365 31 4 2450814
| 1,999 1999 999 99 9 20 4 12 53 365 31 6 2451544
| 2,000 2000 000 00 0 21 1 1 1 1 1 7 2451545
| 2,000 2000 000 00 0 21 4 12 53 366 31 1 2451910
| 2,000 2000 000 00 0 20 1 1 1 1 1 7 2451545
| 2,000 2000 000 00 0 20 4 12 53 366 31 1 2451910
| 2,001 2001 001 01 1 21 1 1 1 1 1 2 2451911
(66 rows)