Обсуждение: about date/time parser

regarding http://archives.postgresql.org/pgsql-hackers/2008-02/msg00826.php

I was wondering why we have a custom written parser to parse the date/time
from/to string and vice versa?
Is there a historical reason? Would a yacc/lex parser be better?

Regards,
Gevik 

"Gevik Babakhani" <pgdev@xs4all.nl> writes:
> Would a yacc/lex parser be better?

Almost certainly neither workable nor an improvement if you did make it
work.  Datetimes don't have enough structure to make yacc useful, and
it's not flexible enough either.
        regards, tom lane

> Almost certainly neither workable nor an improvement if you 
> did make it work.  Datetimes don't have enough structure to 
> make yacc useful, and it's not flexible enough either.

Understood. Thank you :)