Dates BC.

I find this a little strange:

select date_part('year', '0002-01-01 BC'::date);date_part
-----------       -1

It seems 1 BC and 0 are the same year.

In backend/utils/adt/formatting.c:
       if (tmfc.bc)       {               if (tm->tm_year > 0)                       tm->tm_year = -(tm->tm_year - 1);

It this normal or a bug?


Kurt