Day of Year Behaviour

[Hector Villafuerte]

Hi all!
I have 2 fields:
YEAR
DAY_OF_YEAR

and I need to get the complete date out of this, e.g.:
YEAR=2004
DAY_OF_YEAR=1
-> DATE=2004/Jan/1

YEAR=2004
DAY_OF_YEAR=33
-> DATE=2004/Feb/2

I'm using the time module without success:
>>> time.localtime(time.mktime((2004, 0, 0, 0, 0, 0, 0, 1, 0)))
(2003, 11, 30, 0, 0, 0, 6, 334, 0)

Any suggestions? Thanks in advance!
Hector Villafuerte