What is the datatype of the column containing the bad data?

If it is not a DATE, DATETIME, DATETYPE2, or SMALLDATETIME datatype, what it the format of the data?

If you really suspect database corruption, have you run DBCC CHECKDB against that database?

DBCC CHECKDB ( MyDatabase )

WITH NO_INFOMSGS, EXTENDED_LOGICAL_CHECKS, DATA_PURITY;