to_date function

Hi all:

i am use postgres 8.2 on windows XP, following select statement

"select to_date('10 August 2007','DD Month YYYY');"
return me 0007-08-10,

if i do "select to_date('10 September 2007','DD Month YYYY');"
result is correct 2007-09-10

seems like "to_date" function only work correctly for current month.
any one know why?

regards,