I'm giving it a try:
I've replaced the php code and setup a .csv file with columns to match steve098.
When I import an event with dtstart of 07/31/2013 11:00:00 and dtendof 07/31/2013 11:45:00. The actual date that is shows on the event itself is 07/07/2015 11:00:00 and 07/07/2015 11:45:00.
I've created the csv file in Excel and tried messing with formatting the cell as text and date.