More details about the problem: link.
USA - Denmark (played on January 20th, 2007) was added to the database in the spring 2008 (probably March?) and for the point calculations the algorithm uses the March 2008 ranking for Denmark (33), not the January 2007 ranking (23). That's why I had an one point difference between my calculations and the values published by FIFA.
The deadline for matches according to FIFA's website is the Thursday prior to the release date. However, according to FIFA's Information Services department, they try to include most of the matches up to Sunday. Depends on the external company which is calculating the FIFA Rankings.
Many thanks to the guys at FIFA's Informations Services for explaining this issues.