DateTypes or TimestampTypes using createDF

[apple-corps]

I tried to figure out how to use createDF to validate dataFrames with DateTypes. I tried creating DateType while using createDF. It appears that DateType might be a private class of Spark, so perhaps it's not possible. But mentioning that in the Readme, or having an issue might help someone else out if it isn't possible. Otherwise perhaps I am just explaining my ignorance.

val expectedDF = spark.createDF(
        List
        (DateTimeUtils.stringToDate(UTF8String.fromString("1995-07-25"), ZoneId.of("UTC")).get, "nextDayTopRanking", "4", "1"),

        List(
          ("date", DateType, true),
          ("source", StringType, false),
          ("count", LongType, false),
          ("dense_rank", IntegerType, true)
        )
      )