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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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26
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* 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
/* 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 */
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;
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);
#ifdef HAVE_INT64_TIMESTAMP
*result = date * USECS_PER_DAY + time;
/* check for major overflow */
@ -2673,7 +2673,7 @@ timestamp_text(PG_FUNCTION_ARGS)
result = palloc(len);
VARATT_SIZEP(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ));
memmove(VARDATA(result), str, len - VARHDRSZ);
pfree(str);
@ -2704,7 +2704,7 @@ text_timestamp(PG_FUNCTION_ARGS)
sp = VARDATA(str);
dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++)
for (i = 0; i < VARSIZE(str) - VARHDRSZ; i++)
*dp++ = *sp++;
*dp = '\0';
@ -2729,12 +2729,12 @@ timestamptz_text(PG_FUNCTION_ARGS)
str = DatumGetCString(DirectFunctionCall1(timestamptz_out, timestamp));
len = (strlen(str) + VARHDRSZ);
len = strlen(str) + VARHDRSZ;
result = palloc(len);
VARATT_SIZEP(result) = len;
memmove(VARDATA(result), str, (len - VARHDRSZ));
memmove(VARDATA(result), str, len - VARHDRSZ);
pfree(str);
@ -2764,7 +2764,7 @@ text_timestamptz(PG_FUNCTION_ARGS)
sp = VARDATA(str);
dp = dstr;
for (i = 0; i < (VARSIZE(str) - VARHDRSZ); i++)
for (i = 0; i < VARSIZE(str) - VARHDRSZ; i++)
*dp++ = *sp++;
*dp = '\0';
@ -2789,7 +2789,7 @@ interval_text(PG_FUNCTION_ARGS)
str = DatumGetCString(DirectFunctionCall1(interval_out,
IntervalPGetDatum(interval)));
len = (strlen(str) + VARHDRSZ);
len = strlen(str) + VARHDRSZ;
result = palloc(len);
@ -3084,7 +3084,7 @@ timestamptz_trunc(PG_FUNCTION_ARGS)
case DTK_MILLISEC:
#ifdef HAVE_INT64_TIMESTAMP
fsec = ((fsec / 1000) * 1000);
fsec = (fsec / 1000) * 1000;
#else
fsec = rint(fsec * 1000) / 1000;
#endif
@ -3181,7 +3181,7 @@ interval_trunc(PG_FUNCTION_ARGS)
case DTK_MILLISEC:
#ifdef HAVE_INT64_TIMESTAMP
fsec = ((fsec / 1000) * 1000);
fsec = (fsec / 1000) * 1000;
#else
fsec = rint(fsec * 1000) / 1000;
#endif
@ -3932,7 +3932,7 @@ timestamp_zone(PG_FUNCTION_ARGS)
{
text *zone = PG_GETARG_TEXT_P(0);
Timestamp timestamp = PG_GETARG_TIMESTAMP(1);
Timestamp result;
TimestampTz result;
int tz;
pg_tz *tzp;
char tzname[TZ_STRLEN_MAX+1];
@ -3968,7 +3968,7 @@ timestamp_zone(PG_FUNCTION_ARGS)
tzname)));
PG_RETURN_NULL();
}
PG_RETURN_TIMESTAMPTZ(timestamp2timestamptz(result));
PG_RETURN_TIMESTAMPTZ(result);
}
/* timestamp_izone()