You might have discovered by now...

[Gilbert Sebenste]

LDM 6.6.4 has a serious bug in it. Starting at 18Z today, NIDS (level 3) 
files are now being dated one month ahead of schedule. Bug report filed 
with UNIDATA. 6.6.3 is affected by a bug which dates the files a 
month ahead starting at 0Z tonight. Bug report with UNIDATA has been filed.

*******************************************************************************
Gilbert Sebenste                                                     ********
(My opinions only!)                                                  ******
Staff Meteorologist, Northern Illinois University                      ****
E-mail: sebenste at weather.admin.niu.edu                                  ***
web: http://weather.admin.niu.edu                                      **
*******************************************************************************