رد: BUG #16419: wrong parsing BC year in to_date() function

Any one suppose that these functions return the same:
make_date(-1,1,1)
to_date('-1-01-01','yyyy-mm-dd')
But make_date will give 0001-01-01 BC
And to_date will give 0002-01-01 BC

If you think this is right behavior I think this must be documented


من: David G. Johnston <david.g.johnston@gmail.com>
‏‏تم الإرسال: Thursday, May 7, 2020 1:45:14 AM
إلى: dar_alathar@hotmail.com <dar_alathar@hotmail.com>; PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
‏‏الموضوع: Re: BUG #16419: wrong parsing BC year in to_date() function

On Wed, May 6, 2020 at 2:58 PM PG Bug reporting form <noreply@postgresql.org<mailto:noreply@postgresql.org>> wrote:
The following bug has been logged on the website:

Bug reference:      16419
Logged by:          Saeed Hubaishan
Email address:      dar_alathar@hotmail.com<mailto:dar_alathar@hotmail.com>
PostgreSQL version: 12.2
Operating system:   Windows 10x64
Description:

select to_date('-1-01-01','yyyy-mm-dd');
will get
0002-01-01 BC

Yep...

select to_date('1','YYYY')::text; // Year 1 AD
select to_date('0','YYYY')::text; // Year 1 BC (there is no year zero)
select to_date('-1','YYYY')::text; // Year 2 BC

to_date tries very hard to not error - if you need to use it make sure your data conforms to the format you specify.

David J.

من: David G. Johnston<mailto:david.g.johnston@gmail.com>
إرسال: ‏الخميس,‏ ‏14 ‏رمضان,‏ ‏1441 ‏01:45 ‏ص
الموضوع: Re: BUG #16419: wrong parsing BC year in to_date() function

On Wed, May 6, 2020 at 2:58 PM PG Bug reporting form <noreply@postgresql.org<mailto:noreply@postgresql.org>> wrote:
The following bug has been logged on the website:

Bug reference:      16419
Logged by:          Saeed Hubaishan
Email address:      dar_alathar@hotmail.com<mailto:dar_alathar@hotmail.com>
PostgreSQL version: 12.2
Operating system:   Windows 10x64
Description:

select to_date('-1-01-01','yyyy-mm-dd');
will get
0002-01-01 BC

Yep...

select to_date('1','YYYY')::text; // Year 1 AD
select to_date('0','YYYY')::text; // Year 1 BC (there is no year zero)
select to_date('-1','YYYY')::text; // Year 2 BC

to_date tries very hard to not error - if you need to use it make sure your data conforms to the format you specify.

David J.