Re: Question on cast string to date

2022年5月10日(火) 13:28 正华吕 <kainwen(at)gmail(dot)com>:
>
> Hi,
>
> I test the following SQL in pg15dev (seems same behavior as the previous version).
>
> select '2020701'::date;
> date
> ------------
> 0202-07-01
> (1 row)
>
> At the first glance, the result seems quite strange.
>
> Go through the code, postgres use date_in to do the cast, and firstly use last 2 chars to
> get the day, and the 2 chars to get the month, and all remaining chars as year.
>
> The question here is: should we throw error for such input? Or what standard postgres is
> using to cast such kind of string?

This is ISO-8601 format, see here for a list of possible input formats:

https://www.postgresql.org/docs/current/datatype-datetime.html#id-1.5.7.13.18.5

Regards

Ian Barwick

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