Pavel Stehule wrote:
On 14/12/2007, Andrew Chernow <ac@xxxxxxxxx> wrote:
Ran across something that is confusing me. The docs for to_char
indicates that julian day 0 is January 1, 4712 BC at midnight.
http://www.postgresql.org/docs/8.3/static/functions-formatting.html
When I run to_char, I don't get 0 for that date.
postgres=# select to_char('4712-01-01 BC'::date, 'J');
to_char
---------
404
I get julian day 0 for 4714-11-24 BC.
postgres=# select to_char('4714-11-24 BC'::date, 'J');
to_char
---------
0
Output of 'select version()'
PostgreSQL 8.3devel on x86_64-unknown-linux-gnu, compiled by GCC gcc
(GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
andrew
there is more strange things
postgres=# select to_date('0', 'J');
to_date
---------------
0001-01-01 BC
(1 row)
it's wrong, correct is probably ERROR: timestamp out of range
postgres=# select to_date('1', 'J');
to_date
---------------
4714-11-25 BC
(1 row)
Regards
Pavel Stehule
Looks like a difference in calendars: I think the docs give the starting
date in Julian proleptic Calendar while to_char returns Gregorian
proleptic Calendar.
andrew
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