From Apendix B to Part 203 of HMDA's A Guide to HMDA Reporting, Getting it Right!
A. You must ask the applicant for this information (but you cannot require the applicant to provide it) whether the application is taken in person, by mail or telephone, or on the Internet. For applications taken by telephone, the information in the collection form must be stated orally by the lender, except for that information which pertains uniquely to applications taken in writing.
Sounds like it would depend on what you consider the actual "application date". My procedures don't allow me to lock a rate unless I have enough information to complete an application, so in this case I would date my application as of 11/30, but your procedures may be different.
Hope that helps!