implicits not found/working - Long to java.sql.Timestamp, Long to java.sql.Date

[RanUser]

Slick 2.1

My case classes use Longs instead of java.sql.Timestamp or java.sql.Date

Queries in Slick throw errors like this (Postgres is db):

org.postgresql.util.PSQLException: ERROR: operator does not exist: timestamp with time zone >= bigint
  Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.
  Position: 325

I have believe I have the implicits defined correctly and their imported in the proper places:

implicit val LongToTimestamp = MappedColumnType.base[Long, Timestamp](
  longTS => new Timestamp(longTS),
  sqlTS => sqlTS.getTime
)

implicit val LongToDate = MappedColumnType.base[Long, java.sql.Date](
  longTS => new java.sql.Date(longTS),
   sqlDate => sqlDate.getTime
)

What's wrong?  I have implicits for other tables working that convert between JodaTime.DateTime / LocalDate and the SQL counterparts.   Completely stuck on this one...

Thank you

[RanUser]

Forgot to add, this is Scala 2.11.7