0 - 1 of 1 tags for createdate

CreateDate and RemoveDate are two fields in many of the tables related to TDWM e.g. in WlcDefs. The values and their meanings (according to me) are like:

1100301 - 2010/03/01 1091114 - 2009/11/14

What does the first '1' represent in these date fields? and is my interpretation correct?