class SomeEntity {
    ...
    @Type( 
            type=NormalizedTimestamp.class.getName(),
            parameters = {
                    @Parameter( "storage_tz", "utc" )
            }
    )
    public Date getStoredAsUtc() { ... }

    @Type( 
            type=NormalizedTimestamp.class.getName(),
            parameters = {
                    @Parameter( "storage_tz", "cst" )
            }
    )
    public Date getStoredAsCst() { ... }
}