Previous Month used when using CCK Date tokens

I have created a CCK Date field in a content type. I'm calling this new field "month". Its granularity is set as Year, Month. Data seems to be stored properly, because when viewing and editing a node, this date field displays the same year and month that I entered.

However, when I use a token, the previous month is used for replacement. A couple of examples:

I'm using these tokens in autonodetitle for date and year, coming from the Date CCK field:
[field_month-month] [field_month-yyyy]
I have entered Jan 2009 as the month field. Then "December 2008" gets inserted into the title, to replace the tokens.

I'm using these tokens as part of the filepath (made available by filefield_path module):
my-files/[field_month-yyyy]-[field_month-mm]
After entering Jan 2009 as the month, the filefield becomes this:
my-files/2008-12

Or if I enter Apr 2008, the path becomes my-files/2008-03