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Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL convention

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for the sign of timezone offsets, ie, positive is east from UTC.  These
were previously out of step with other operations that accept or show
timezones, such as I/O of timestamptz values.
This commit is contained in:
Tom Lane 2003-07-17 00:55:37 +00:00
parent 93236b58e0
commit 764f72dc82
10 changed files with 74 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.159 2003/07/15 19:19:55 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.160 2003/07/17 00:55:36 tgl Exp $
PostgreSQL documentation
-->
@ -5016,16 +5016,16 @@ SELECT EXTRACT(SECOND FROM TIME '17:12:28.5');
</screen>
</listitem>
</varlistentry>
<!--
<varlistentry>
<term><literal>timezone</literal></term>
<listitem>
<para>
The time zone offset. XXX But in what units?
The time zone offset from UTC, measured in seconds. Positive values
correspond to time zones east of UTC, negative values to
zones west of UTC.
</para>
</listitem>
</varlistentry>
-->
<varlistentry>
<term><literal>timezone_hour</literal></term>

10
doc/src/sgml/ref/set.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.78 2003/07/15 19:19:56 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.79 2003/07/17 00:55:36 tgl Exp $
PostgreSQL documentation
-->
@ -182,16 +182,16 @@ SELECT setseed(<replaceable>value</replaceable>);
</listitem>
</varlistentry>
<varlistentry>
<term><literal>7</literal></term>
<term><literal>-7</literal></term>
<listitem>
<para>
The time zone 7 hours west from UTC (equivalent
to PDT). Negative values are east from UTC.
to PDT). Positive values are east from UTC.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>INTERVAL '08:00' HOUR TO MINUTE</literal></term>
<term><literal>INTERVAL '-08:00' HOUR TO MINUTE</literal></term>
<listitem>
<para>
The time zone 8 hours west from UTC (equivalent
@ -205,7 +205,7 @@ SELECT setseed(<replaceable>value</replaceable>);
<listitem>
<para>
Set the time zone to your local time zone (the one that
your operating system defaults to).
the server's operating system defaults to).
</para>
</listitem>
</varlistentry>

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

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.197 2003/07/15 19:19:55 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.198 2003/07/17 00:55:36 tgl Exp $
-->
<appendix id="release">
@ -24,6 +24,8 @@ CDATA means the content is "SGML-free", so you can write without
worries about funny characters.
-->
<literallayout><![CDATA[
EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE now follow SQL sign convention
(positive = east of UTC)
Output of SHOW DATESTYLE is now in the same format accepted by SET DATESTYLE
PL/Python is now an untrusted language, and is renamed to 'plpythonu'
Dollar sign ($) is no longer allowed in operator names

13
src/backend/commands/variable.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.81 2003/07/15 19:34:43 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.82 2003/07/17 00:55:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -429,7 +429,8 @@ assign_timezone(const char *value, bool doit, bool interactive)
}
if (doit)
{
CTimeZone = interval->time;
/* Here we change from SQL to Unix sign convention */
CTimeZone = - interval->time;
HasCTZSet = true;
}
pfree(interval);
@ -444,7 +445,8 @@ assign_timezone(const char *value, bool doit, bool interactive)
{
if (doit)
{
CTimeZone = hours * 3600;
/* Here we change from SQL to Unix sign convention */
CTimeZone = - hours * 3600;
HasCTZSet = true;
}
}
@ -557,7 +559,8 @@ assign_timezone(const char *value, bool doit, bool interactive)
return NULL;
if (HasCTZSet)
snprintf(result, sizeof(tzbuf), "%.5f", (double) CTimeZone / 3600.0);
snprintf(result, sizeof(tzbuf), "%.5f",
(double) (-CTimeZone) / 3600.0);
else if (tzbuf[0] == 'T')
strcpy(result, tzbuf + 3);
else
@ -579,7 +582,7 @@ show_timezone(void)
Interval interval;
interval.month = 0;
interval.time = CTimeZone;
interval.time = - CTimeZone;
tzn = DatumGetCString(DirectFunctionCall1(interval_out,
IntervalPGetDatum(&interval)));

13
src/backend/utils/adt/date.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.83 2003/06/16 18:56:45 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.84 2003/07/17 00:55:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2031,17 +2031,18 @@ timetz_part(PG_FUNCTION_ARGS)
switch (val)
{
case DTK_TZ:
result = tz;
result = -tz;
break;
case DTK_TZ_MINUTE:
result = tz / 60;
TMODULO(result, dummy, 60e0);
result = -tz;
result /= 60;
FMODULO(result, dummy, 60e0);
break;
case DTK_TZ_HOUR:
dummy = tz;
TMODULO(dummy, result, 3600e0);
dummy = -tz;
FMODULO(dummy, result, 3600e0);
break;
case DTK_MICROSEC:

16
src/backend/utils/adt/nabstime.c
View File

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.108 2003/05/12 23:08:50 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.109 2003/07/17 00:55:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -825,12 +825,14 @@ reltimesend(PG_FUNCTION_ARGS)
static void
reltime2tm(RelativeTime time, struct tm * tm)
{
TMODULO(time, tm->tm_year, 31557600);
TMODULO(time, tm->tm_mon, 2592000);
TMODULO(time, tm->tm_mday, 86400);
TMODULO(time, tm->tm_hour, 3600);
TMODULO(time, tm->tm_min, 60);
TMODULO(time, tm->tm_sec, 1);
double dtime = time;
FMODULO(dtime, tm->tm_year, 31557600);
FMODULO(dtime, tm->tm_mon, 2592000);
FMODULO(dtime, tm->tm_mday, 86400);
FMODULO(dtime, tm->tm_hour, 3600);
FMODULO(dtime, tm->tm_min, 60);
FMODULO(dtime, tm->tm_sec, 1);
}

13
src/backend/utils/adt/timestamp.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.85 2003/07/04 18:21:13 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.86 2003/07/17 00:55:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3080,17 +3080,18 @@ timestamptz_part(PG_FUNCTION_ARGS)
switch (val)
{
case DTK_TZ:
result = tz;
result = -tz;
break;
case DTK_TZ_MINUTE:
result = tz / 60;
TMODULO(result, dummy, 60e0);
result = -tz;
result /= 60;
FMODULO(result, dummy, 60e0);
break;
case DTK_TZ_HOUR:
dummy = tz;
TMODULO(dummy, result, 3600e0);
dummy = -tz;
FMODULO(dummy, result, 3600e0);
break;
case DTK_MICROSEC:

6
src/include/miscadmin.h
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.125 2003/06/27 19:08:38 tgl Exp $
* $Id: miscadmin.h,v 1.126 2003/07/17 00:55:37 tgl Exp $
*
* NOTES
* some of the information in this file should be moved to
@ -147,7 +147,9 @@ extern DLLIMPORT Oid MyDatabaseId;
* EuroDates if client prefers dates interpreted and written w/European conventions.
*
* HasCTZSet is true if user has set timezone as a numeric offset from UTC.
* If so, CTimeZone is the timezone offset in seconds.
* If so, CTimeZone is the timezone offset in seconds (using the Unix-ish
* sign convention, ie, positive offset is west of UTC, rather than the
* SQL-ish convention that positive is east of UTC).
*/
#define MAXTZLEN 10 /* max TZ name len, not counting tr. null */

17
src/include/utils/datetime.h
View File

@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: datetime.h,v 1.39 2003/05/18 01:06:26 tgl Exp $
* $Id: datetime.h,v 1.40 2003/07/17 00:55:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -196,12 +196,23 @@ typedef struct
} datetkn;
/* TMODULO()
/* FMODULO()
* Macro to replace modf(), which is broken on some platforms.
* t = input and remainder
* q = integer part
* u = divisor
*/
#define FMODULO(t,q,u) \
do { \
q = ((t < 0) ? ceil(t / u): floor(t / u)); \
if (q != 0) t -= rint(q * u); \
} while(0)
/* TMODULO()
* Like FMODULO(), but work on the timestamp datatype (either int64 or float8).
* We assume that int64 follows the C99 semantics for division (negative
* quotients truncate towards zero).
*/
#ifdef HAVE_INT64_TIMESTAMP
#define TMODULO(t,q,u) \
do { \
@ -211,7 +222,7 @@ do { \
#else
#define TMODULO(t,q,u) \
do { \
q = ((t < 0)? ceil(t / u): floor(t / u)); \
q = ((t < 0) ? ceil(t / u): floor(t / u)); \
if (q != 0) t -= rint(q * u); \
} while(0)
#endif

15
src/interfaces/ecpg/pgtypeslib/dt.h
View File

@ -183,12 +183,23 @@ typedef struct
} datetkn;
/* TMODULO()
/* FMODULO()
* Macro to replace modf(), which is broken on some platforms.
* t = input and remainder
* q = integer part
* u = divisor
*/
#define FMODULO(t,q,u) \
do { \
q = ((t < 0) ? ceil(t / u): floor(t / u)); \
if (q != 0) t -= rint(q * u); \
} while(0)
/* TMODULO()
* Like FMODULO(), but work on the timestamp datatype (either int64 or float8).
* We assume that int64 follows the C99 semantics for division (negative
* quotients truncate towards zero).
*/
#ifdef HAVE_INT64_TIMESTAMP
#define TMODULO(t,q,u) \
do { \
@ -198,7 +209,7 @@ do { \
#else
#define TMODULO(t,q,u) \
do { \
q = ((t < 0)? ceil(t / u): floor(t / u)); \
q = ((t < 0) ? ceil(t / u): floor(t / u)); \
if (q != 0) t -= rint(q * u); \
} while(0)
#endif