Assuming a range of dates, such as:

9/26/2000
2/13/2001
9/11/2001
2/12/2002
9/16/2002
2/3/2003
2/4/2003
9/29/2003
9/30/2003
2/24/2004
2/25/2004
6/7/2004
6/8/2004
10/4/2004
10/5/2004
12/22/2004
2/15/2005
2/16/2005

Anyone have an algorithym that might predict future recurring events?