I presume that you are using something similar to:

Select DATEADD(MI,LastPostDate,'20000101')
from ActiveForums_ForumTopics

To convert the integer field into a usable date format.

Can you confirm the method you use please?

The value in that field is being generated as follows.
DATEDIFF(ss,'01/01/1970 00:00:00 AM',DATECREATED)

You will notice that there are a couple other date fields also in that table. We are only using the LastPostDate for indexing/sorting purposes since it will produce better results than a typical datetime field.

Thanks Will,

Got it.