On 06/23/2011 01:07 PM, Steve Crawford wrote: > On 06/23/2011 12:30 PM, hernan gonzalez wrote: >> >> >> On Thu, Jun 23, 2011 at 4:15 PM, Adrian Klaver >> <adrian.klaver@xxxxxxxxx <mailto:adrian.klaver@xxxxxxxxx>> wrote: >> >> On 06/23/2011 11:40 AM, hernan gonzalez wrote: >> >> Rather than being not viable, I'd argue that is is not correct. >> Rather, a simple direct cast will suffice: >> '2011-12-30 00:30:00'::timestamp without time zone >> >> >> That works only for that particular format. The point is that, for >> example, if I have some local date time >> stored as a string in other format ('30/12/2011 00:30:00') I >> cannot >> reliably parse it as a TIMESTAMP. Which I should. >> >> >> Works here. I am in US PDT: >> >> select to_timestamp('30/12/2011 00:30:00', 'DD/MM/YYYY HH24:MI:SS >> ')::timestamp with time zone; >> >> to_timestamp >> ------------------------ >> 2011-12-30 00:30:00-08 >> >> >> My point is to parse a TIMESTAMP WITHOUT TIME ZONE - and that that >> should NOT depend on the server/session TIMEZONE. >> >> Try this: >> >> # set TIMEZONE='XXX8'; >> # select to_timestamp('2007-12-30 00:30:00','YYYY-MM-DD >> HH24:MI:SS')::timestamp; >> 2007-12-30 00:30:00 >> # set TIMEZONE='America/Argentina/Buenos_Aires'; >> select to_timestamp('2007-12-30 00:30:00','YYYY-MM-DD >> HH24:MI:SS')::timestamp; >> 2007-12-30 01:30:00 > ...snip... > > Every example here starts, at its core, with to_timestamp. That function > returns a timestamp *with* time zone so of-course the current timezone > setting will influence it. Stop using it - it doesn't do what you want. > > If you cast directly to a timestamp *without* time zone you can take > advantage of the many formats PostgreSQL supports. > > See: > http://www.postgresql.org/docs/9.0/interactive/datatype-datetime.html#DATATYPE-DATETIME-DATE-TABLE > for supported formats. Note also that you can use "set datestyle" to > match your MDY or DMY date formatting. > > If the format you require is so obscure that PostgreSQL can't handle it > out-of-the-box (and the one you have presented is completely vanilla), > use the many string-handling functions to alter your input as necessary. Possibly: test=> select (to_date('30/12/2007','DD/MM/YYYY') + '00:30'::time)::timestamp; timestamp --------------------- 2007-12-30 00:30:00 (1 row) > > Cheers, > Steve > -- Adrian Klaver adrian.klaver@xxxxxxxxx
test=# SET datestyle to DMY;
SET
test=# select '30/12/2011 00:30:00'::timestamp;
timestamp
---------------------
2011-12-30 00:30:00
(1 row)
test=#
