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Fix AT TIME ZONE for timestamps without time zones:

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test=> select ('2005-07-20 00:00:00'::timestamp without time zone) at
	time zone 'Europe/Paris';
	        timezone
	------------------------
	 2005-07-19 22:00:00-04

Udpate documentation.
This commit is contained in:
Bruce Momjian 2005-07-22 21:16:15 +00:00
parent 4749e914ae
commit 261026575d
2 changed files with 22 additions and 22 deletions
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18
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.268 2005/07/20 16:42:29 momjian Exp $ $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.269 2005/07/22 21:16:14 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -5693,7 +5693,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>timestamp without time zone</type> AT TIME ZONE <replaceable>zone</></literal> <literal><type>timestamp without time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry> </entry>
<entry><type>timestamp with time zone</type></entry> <entry><type>timestamp with time zone</type></entry>
<entry>Convert local time in given time zone to UTC</entry> <entry>Treat given timestamp <emphasis>without time zone</> as located in the specified time zone</entry>
</row> </row>
<row> <row>
@ -5701,7 +5701,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>timestamp with time zone</type> AT TIME ZONE <replaceable>zone</></literal> <literal><type>timestamp with time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry> </entry>
<entry><type>timestamp without time zone</type></entry> <entry><type>timestamp without time zone</type></entry>
<entry>Convert UTC to local time in given time zone</entry> <entry>Convert given timestamp <emphasis>with time zone</> to the new time zone</entry>
</row> </row>
<row> <row>
@ -5709,7 +5709,7 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
<literal><type>time with time zone</type> AT TIME ZONE <replaceable>zone</></literal> <literal><type>time with time zone</type> AT TIME ZONE <replaceable>zone</></literal>
</entry> </entry>
<entry><type>time with time zone</type></entry> <entry><type>time with time zone</type></entry>
<entry>Convert local time across time zones</entry> <entry>Convert given time <emphasis>with time zone</> to the new time zone</entry>
</row> </row>
</tbody> </tbody>
</tgroup> </tgroup>
@ -5720,7 +5720,8 @@ SELECT date_trunc('year', TIMESTAMP '2001-02-16 20:38:40');
specified either as a text string (e.g., <literal>'PST'</literal>) specified either as a text string (e.g., <literal>'PST'</literal>)
or as an interval (e.g., <literal>INTERVAL '-08:00'</literal>). or as an interval (e.g., <literal>INTERVAL '-08:00'</literal>).
In the text case, the available zone names are those shown in In the text case, the available zone names are those shown in
<xref linkend="datetime-timezone-set-table">. <xref linkend="datetime-timezone-set-table">. The time zone can
also be implied using the default time zone for that session.
</para> </para>
<para> <para>
@ -5732,10 +5733,9 @@ SELECT TIMESTAMP '2001-02-16 20:38:40' AT TIME ZONE 'MST';
SELECT TIMESTAMP WITH TIME ZONE '2001-02-16 20:38:40-05' AT TIME ZONE 'MST'; SELECT TIMESTAMP WITH TIME ZONE '2001-02-16 20:38:40-05' AT TIME ZONE 'MST';
<lineannotation>Result: </lineannotation><computeroutput>2001-02-16 18:38:40</computeroutput> <lineannotation>Result: </lineannotation><computeroutput>2001-02-16 18:38:40</computeroutput>
</screen> </screen>
The first example takes a zone-less time stamp and interprets it as MST time The first example takes a time stamp without time zone and interprets it as MST time
(UTC-7) to produce a UTC time stamp, which is then rotated to PST (UTC-8) (UTC-7), which is then converted to PST (UTC-8) for display. The second example takes
for display. The second example takes a time stamp specified in EST a time stamp specified in EST (UTC-5) and converts it to local time in MST (UTC-7).
(UTC-5) and converts it to local time in MST (UTC-7).
</para> </para>
<para> <para>

26
src/backend/utils/adt/timestamp.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.141 2005/07/22 19:00:54 momjian Exp $ * $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.142 2005/07/22 21:16:15 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1035,7 +1035,7 @@ timestamp2tm(Timestamp dt, int *tzp, struct pg_tm *tm, fsec_t *fsec, char **tzn,
#endif #endif
/* add offset to go from J2000 back to standard Julian date */ /* add offset to go from J2000 back to standard Julian date */
date +=POSTGRES_EPOCH_JDATE; date += POSTGRES_EPOCH_JDATE;
/* Julian day routine does not work for negative Julian days */ /* Julian day routine does not work for negative Julian days */
if (date <0 || date >(Timestamp) INT_MAX) if (date <0 || date >(Timestamp) INT_MAX)
@ -1147,8 +1147,8 @@ tm2timestamp(struct pg_tm *tm, fsec_t fsec, int *tzp, Timestamp *result)
return -1; return -1;
date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE; date = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;
time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec); time = time2t(tm->tm_hour, tm->tm_min, tm->tm_sec, fsec);
#ifdef HAVE_INT64_TIMESTAMP #ifdef HAVE_INT64_TIMESTAMP
*result = date * USECS_PER_DAY + time; *result = date * USECS_PER_DAY + time;
/* check for major overflow */ /* check for major overflow */
@ -2673,7 +2673,7 @@ timestamp_text(PG_FUNCTION_ARGS)
result = palloc(len); result = palloc(len);
VARATT_SIZEP(result) = len; VARATT_SIZEP(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ)); memmove(VARDATA(result), str, len - VARHDRSZ);
pfree(str); pfree(str);
@ -2704,7 +2704,7 @@ text_timestamp(PG_FUNCTION_ARGS)
sp = VARDATA(str); sp = VARDATA(str);
dp = dstr; dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++) for (i = 0; i < VARSIZE(str) - VARHDRSZ; i++)
*dp++ = *sp++; *dp++ = *sp++;
*dp = '\0'; *dp = '\0';
@ -2729,12 +2729,12 @@ timestamptz_text(PG_FUNCTION_ARGS)
str = DatumGetCString(DirectFunctionCall1(timestamptz_out, timestamp)); str = DatumGetCString(DirectFunctionCall1(timestamptz_out, timestamp));
len = (strlen(str) + VARHDRSZ); len = strlen(str) + VARHDRSZ;
result = palloc(len); result = palloc(len);
VARATT_SIZEP(result) = len; VARATT_SIZEP(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ)); memmove(VARDATA(result), str, len - VARHDRSZ);
pfree(str); pfree(str);
@ -2764,7 +2764,7 @@ text_timestamptz(PG_FUNCTION_ARGS)
sp = VARDATA(str); sp = VARDATA(str);
dp = dstr; dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++) for (i = 0; i < VARSIZE(str) - VARHDRSZ; i++)
*dp++ = *sp++; *dp++ = *sp++;
*dp = '\0'; *dp = '\0';
@ -2789,7 +2789,7 @@ interval_text(PG_FUNCTION_ARGS)
str = DatumGetCString(DirectFunctionCall1(interval_out, str = DatumGetCString(DirectFunctionCall1(interval_out,
IntervalPGetDatum(interval))); IntervalPGetDatum(interval)));
len = (strlen(str) + VARHDRSZ); len = strlen(str) + VARHDRSZ;
result = palloc(len); result = palloc(len);
@ -3084,7 +3084,7 @@ timestamptz_trunc(PG_FUNCTION_ARGS)
case DTK_MILLISEC: case DTK_MILLISEC:
#ifdef HAVE_INT64_TIMESTAMP #ifdef HAVE_INT64_TIMESTAMP
fsec = ((fsec / 1000) * 1000); fsec = (fsec / 1000) * 1000;
#else #else
fsec = rint(fsec * 1000) / 1000; fsec = rint(fsec * 1000) / 1000;
#endif #endif
@ -3181,7 +3181,7 @@ interval_trunc(PG_FUNCTION_ARGS)
case DTK_MILLISEC: case DTK_MILLISEC:
#ifdef HAVE_INT64_TIMESTAMP #ifdef HAVE_INT64_TIMESTAMP
fsec = ((fsec / 1000) * 1000); fsec = (fsec / 1000) * 1000;
#else #else
fsec = rint(fsec * 1000) / 1000; fsec = rint(fsec * 1000) / 1000;
#endif #endif
@ -3932,7 +3932,7 @@ timestamp_zone(PG_FUNCTION_ARGS)
{ {
text *zone = PG_GETARG_TEXT_P(0); text *zone = PG_GETARG_TEXT_P(0);
Timestamp timestamp = PG_GETARG_TIMESTAMP(1); Timestamp timestamp = PG_GETARG_TIMESTAMP(1);
Timestamp result; TimestampTz result;
int tz; int tz;
pg_tz *tzp; pg_tz *tzp;
char tzname[TZ_STRLEN_MAX+1]; char tzname[TZ_STRLEN_MAX+1];
@ -3968,7 +3968,7 @@ timestamp_zone(PG_FUNCTION_ARGS)
tzname))); tzname)));
PG_RETURN_NULL(); PG_RETURN_NULL();
} }
PG_RETURN_TIMESTAMPTZ(timestamp2timestamptz(result)); PG_RETURN_TIMESTAMPTZ(result);
} }
/* timestamp_izone() /* timestamp_izone()