The Sage 100 Library Master Date is set automatically from Windows. This is related to when you enter a two digit year, which Century the date defaults to. For example a date like 10/10/31 it displays as 10/10/1931. In MAS 3.71 it was controlled or set in File/Preferences. But I cannot find a place to reset the field (from Default 30) in the MAS front end.