Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commit9e9724e

Browse files
committed
Fix wrong week returnded by date_trunc('week') for early dates in
January --- would return wrong year for 2005-01-01 and 2006-01-01.per report from Robert Creager.Backpatch to 8.0.X.
1 parenta70574d commit9e9724e

File tree

2 files changed

+34
-6
lines changed

2 files changed

+34
-6
lines changed

‎doc/src/sgml/func.sgml

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.243 2005/03/30 04:52:49 neilc Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.244 2005/04/01 14:25:22 momjian Exp $
33
PostgreSQL documentation
44
-->
55

@@ -5472,6 +5472,12 @@ SELECT EXTRACT(SECOND FROM TIME '17:12:28.5');
54725472
week starts on Monday.) In other words, the first Thursday of
54735473
a year is in week 1 of that year. (for <type>timestamp</type> values only)
54745474
</para>
5475+
<para>
5476+
Because of this, it is possible for early January dates to be part of the
5477+
52nd or 53rd week of the previous year. For example, <literal>2005-01-01</>
5478+
is part of the 53rd week of year 2004, and <literal>2006-01-01</> is part of
5479+
the 52nd week of year 2005.
5480+
</para>
54755481

54765482
<screen>
54775483
SELECT EXTRACT(WEEK FROM TIMESTAMP '2001-02-16 20:38:40');

‎src/backend/utils/adt/timestamp.c

Lines changed: 27 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.117 2004/12/31 22:01:22 pgsql Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.118 2005/04/01 14:25:23 momjian Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -2754,12 +2754,23 @@ timestamp_trunc(PG_FUNCTION_ARGS)
27542754
switch (val)
27552755
{
27562756
caseDTK_WEEK:
2757-
isoweek2date(date2isoweek(tm->tm_year,tm->tm_mon,tm->tm_mday),&(tm->tm_year),&(tm->tm_mon),&(tm->tm_mday));
2757+
{
2758+
intwoy;
2759+
2760+
woy=date2isoweek(tm->tm_year,tm->tm_mon,tm->tm_mday);
2761+
/*
2762+
*If it is week 52/53 and the month is January,
2763+
*then the week must belong to the previous year.
2764+
*/
2765+
if (woy >=52&&tm->tm_mon==1)
2766+
--tm->tm_year;
2767+
isoweek2date(woy,&(tm->tm_year),&(tm->tm_mon),&(tm->tm_mday));
27582768
tm->tm_hour=0;
27592769
tm->tm_min=0;
27602770
tm->tm_sec=0;
27612771
fsec=0;
27622772
break;
2773+
}
27632774
caseDTK_MILLENNIUM:
27642775
/* see comments in timestamptz_trunc */
27652776
if (tm->tm_year>0)
@@ -2874,13 +2885,24 @@ timestamptz_trunc(PG_FUNCTION_ARGS)
28742885
switch (val)
28752886
{
28762887
caseDTK_WEEK:
2877-
isoweek2date(date2isoweek(tm->tm_year,tm->tm_mon,tm->tm_mday),&(tm->tm_year),&(tm->tm_mon),&(tm->tm_mday));
2888+
{
2889+
intwoy;
2890+
2891+
woy=date2isoweek(tm->tm_year,tm->tm_mon,tm->tm_mday);
2892+
/*
2893+
*If it is week 52/53 and the month is January,
2894+
*then the week must belong to the previous year.
2895+
*/
2896+
if (woy >=52&&tm->tm_mon==1)
2897+
--tm->tm_year;
2898+
isoweek2date(woy,&(tm->tm_year),&(tm->tm_mon),&(tm->tm_mday));
28782899
tm->tm_hour=0;
28792900
tm->tm_min=0;
28802901
tm->tm_sec=0;
28812902
fsec=0;
28822903
redotz= true;
28832904
break;
2905+
}
28842906
/* one may consider DTK_THOUSAND and DTK_HUNDRED... */
28852907
caseDTK_MILLENNIUM:
28862908

@@ -3142,7 +3164,7 @@ date2isoweek(int year, int mon, int mday)
31423164
* Sometimes the last few days in a year will fall into the first week
31433165
* of the next year, so check for this.
31443166
*/
3145-
if (result >=53)
3167+
if (result >=52)
31463168
{
31473169
day4=date2j(year+1,1,4);
31483170

@@ -3198,7 +3220,7 @@ date2isoyear(int year, int mon, int mday)
31983220
* Sometimes the last few days in a year will fall into the first week
31993221
* of the next year, so check for this.
32003222
*/
3201-
if (result >=53)
3223+
if (result >=52)
32023224
{
32033225
day4=date2j(year+1,1,4);
32043226

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp