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Change EXTRACT(EPOCH FROM timestamp) so that a timestamp without time zone

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is assumed to be in local time, not GMT.  This improves consistency with
other operations, which all assume local timezone when it matters.  Per
bug #897.
This commit is contained in:
Tom Lane 2003-02-27 21:36:58 +00:00
parent 3d1a1e85cf
commit 191ef2b407
1 changed files with 17 additions and 4 deletions
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21
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.78 2003/02/22 05:57:45 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.79 2003/02/27 21:36:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2865,13 +2865,26 @@ timestamp_part(PG_FUNCTION_ARGS)
switch (val)
{
case DTK_EPOCH:
{
int tz;
TimestampTz timestamptz;
/* convert to timestamptz to produce consistent results */
if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL) != 0)
elog(ERROR, "Unable to convert TIMESTAMP to TIMESTAMP WITH TIME ZONE (tm)");
tz = DetermineLocalTimeZone(tm);
if (tm2timestamp(tm, fsec, &tz, &timestamptz) != 0)
elog(ERROR, "Unable to convert TIMESTAMP to TIMESTAMP WITH TIME ZONE");
#ifdef HAVE_INT64_TIMESTAMP
result = ((timestamp - SetEpochTimestamp()) / 1000000e0);
result = ((timestamptz - SetEpochTimestamp()) / 1000000e0);
#else
result = timestamp - SetEpochTimestamp();
result = timestamptz - SetEpochTimestamp();
#endif
break;
}
case DTK_DOW:
if (timestamp2tm(timestamp, NULL, tm, &fsec, NULL) != 0)
elog(ERROR, "Unable to encode TIMESTAMP");