How to store the timestamp in the server side for Cassandra?

I've tried using the code below:

    final Session session = connection.getSession();
    final String keyspaceName = session.getLoggedKeyspace();
    psInsert = session.prepare(QueryBuilder
            .insertInto(keyspaceName, CampaignConstants.TABLE_NAME_SAMPLE)
            .value("ID", QueryBuilder.bindMarker())
            .value("NAME", QueryBuilder.bindMarker())
            .value("UPDATE_TIME", QueryBuilder.now()));

The column "UPDATE_TIME" is of type "timestamp". I can't modify it to "TimeUUID" type.

I'm getting this error:

> com.datastax.driver.core.exceptions.InvalidQueryException: Type error:
> cannot assign result of function system.now (type timeuuid) to
> update_time (type timestamp)

The function call QueryBuilder.now() returns a Java instance of class: com.datastax.driver.core.querybuilder.Utils$FCall.

I've searched around, but the documentation doesn't specify how to use this now() function using the driver.

in CQL you need to use following expression: toTimestamp(now()).

For Java driver 4.x it's translated into the following: instead of QueryBuilder.now(), you need to use QueryBuilder.toTimestamp(QueryBuilder.now().

For Java driver 3.x, you need to wrap QueryBuilder.now() into the QueryBuilder.fcall, something like this: QueryBuilder.fcall("toTimestamp", QueryBuilder.now())