I am using Endnote v 9 and regularly import citations from PubMed (save as a file from PubMed, open Endnote, import using a slightly modified PubMed filter).
As citations are starting to have 2010 publication dates, these citations show up without a number in the year field in my library.
The filter has the following form for date of publication:
which worked just fine for 2009 citations, but it does not seem able to handle citations with
DP - 2010 Jan