I had a colleague point out to me yesterday that if you are using the Smallworld FME interface for CST 4.1 you need to verify that your date (and date_time I suppose) attributes are being exported correctly. After further analysis both I and he discovered that dates prior to 01Jan1970 and after 07Feb2106 will not be copied across correctly. The 07Feb2106 threshold may not be problematic for most Smallworld users but the 01Jan1970 threshold definitely is.
For example, if you have an "installed date" attribute of 04Dec1969 and you extracted it using the Smallworld FME 4.1 interface you would notice that FME recognizes it as 10Jan2106. So your feature ends up going back to the future but your users of the exported data come back to you.
I have raised a case with GE Help Desk on this issue and they are looking into it.
(I have not tested this on the Smallworld FME interface for CST 4.0.)