After some investigation, this appears to come from some misinterpreted information in a highly technical article discussing how one might calculate trajetories of a hypothetical object similar to the asteroid Toutatis, which will approach the Earth to within perhaps a million miles in September. The results of this hypothetical orbit were back-calculated to give the impact date in Sept. of this year. This was probably a mathematical exercise by advanced astronomy students that got blown all out of proportion. People should read things more carefully. I don't know if the Maxim article is tongue-in-cheek or the guy was really that confused, I suspect the former.
Below is a list of close approaches by asteroids for Sept. of this year. From Harvard website. The distance from the earth to the moon is about .0026 AU I think.
LINK
OBJECT--------------DATE-------------DISTANCE (AU)-----ORBIT ARC
2000 AE205----------2004 Sept. 4.62----0.1611-------1-opposition, arc = 53 days MPC 39582
2002 CE26-----------2004 Sept. 5.47----0.1019-------2 oppositions, 2002-2003 MPO 47171
2003 UX34-----------2004 Sept. 8.85----0.05239------1-opposition, arc = 26 days MPO 57991
2001 CC21-----------2004 Sept.14.11---0.08536------5 oppositions, 1982-2004 MPO 57800
1998 OX4------------2004 Sept.14.43----0.06429------3 oppositions, 1998-2003 MPO 47733
(11066) Sigurd------2004 Sept.15.54----0.1367-------5 oppositions, 1992-1999 MPC 35228
(66063) 1998 RO1--2004 Sept.26.89----0.09213------7 oppositions, 1996-2003 E2003-R23
2002 VZ91-----------2004 Sept.28.94----0.04882------1-opposition, arc = 16 days MPO 41866
(4179) Toutatis------2004 Sept.29.57----0.01036------8 oppositions, 1988-2000 MPO 6175