Hi Tom,
thanks for the response.
Tom Lane wrote:
jgirvin <james.gir...@oasissystems.com.au> writes:
Australia will come out of DST on the 4th April 2010 at 03:00:00 and
will be +9:30 from utc, currently we are +10:30 utc.
OK, so this is a "fall back" transition for you guys, right?
Yes this is correct Adelaide, South Aust will be coming out of
(Australian) CDT back into (Australian) CST.
This is 4 seconds into the last hour prior to dst changeover, now the
to_timestamp result is showing +09:30 as the offset and now() correctly
shows +10:30
# select now(), to_timestamp( to_char(now(),'yyyy-mm-dd
hh24:mi:ss'),'yyyy-mm-dd hh24:mi:ss');
now | to_timestamp
----------------------------------+---------------------------
2010-04-04 02:00:04.841797+10:30 | 2010-04-04 02:00:04+09:30
(1 row)
Can someone explain as to why the output from the to_timestamp shows the
offset at +09:30 when within the hour of the dst changeover and is this
expected....
The problem is that the output of to_char() is ambiguous, since you
didn't include the timezone in the format spec. Times between 02:00 and
03:00 occur twice on that date, and there's no way to know which time
"02:00:04" refers to. The assumption that to_timestamp uses (along with
our other datetime input code) is that an ambiguous time should be
resolved as standard time, ie, the second occurrence of "02:00:04".
Okay, that makes sense.
regards, tom lane
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James Girvin
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