Date columns/fields to be imported

The import works very well for many fields-- thanks!

I wish it could recognize dates. For example, I have a table of upcoming events. The node_import skips over the date columns. I tried formatting the dates in a few ways, but I couldn't get node_import to work with those columns.

Here are a few rows of my data:

Biomembrane Organization and Protein Function / From Computation to Experiment,http://CECAM/workshop.memphys.sdu.dk/,2005/04/04,2005/04/06,yes,webmaste...
Water dimers and Weakly Interacting Species in Atmospheric Modeling,,2005/04/25,2005/04/27,yes,webmaster@university.edu,yes
EXC!TiNG Symposium on Excited/state properties of solids,http://cmt.physik.uni/kl.de/XSM05/,2005/05/16,2005/05/19,yes,webmaster@u...
Simulation of rare events: The reaction coordinate problem in complex systems,http://www.titus.cecam.fr/cecamworkshop/,2005/06/02,2005/06/04,yes,webma...

My content type's fields are:
Event
URL
Start date
End date
Location
Email contact
Consider for Travel Program

My system is running:
Drupal 6.12
MySQL database 5.0.37
PHP 5.2.4

Thanks! The module works well, and the interface is clear.