Multi calendar system for pgsql

Hi everyone,

I want to try to add a multi calendar system for pgsql. I want to know if it will be accepted as a patch to pgsql?

More details:

Multi calendar systems are useful for several languages and countries using different calendar: Hijri, Persian, Hebrew, etc.

For implementation I think it is better to add this support in date fields like this: 

create table tb (dt date calendar persian);

if no calendar is defined, it will be Gregorian so no problem is made for old sql commands.

I am new in pgsql dev but if I know this patch will be accepted, I am happy to work on it.

Regards,

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__ \ /_\\_-//_ Mohsen Alimomeni