Did you get anywhere with this? I appreciate I am reopening a 12+ month old thread, but I am having the same problem and don't see a fix anywhere online.
I've tried formatting the cells in Excel as custom mmm dd hh:mm:ss as it appears on screen in the event log, however all the dates then revert to the first of the month in which they occurred.
In my case I am exporting a months worth of event log, so am looking back to the 30th September. When I format as described above, events which occured on the 30th September in the event log now appear as the 1st September which is not correct.