You are using trace32 to view CM2012 log files but the date/time field is blank.  Why?  Well, you are more than likely using the "old" version of trace (the CM2007 version).  Close the version you are using and go to the Tools folder in the CM2012 source media and copy the new trace32.exe.  For CM2012 beta 2 the timestamp for the updated trace32.exe file is 3/15/2011.