Decode Joda DateTime with circe

CirceDateTimeDecoder.scala

import io.circe.generic.auto._
import io.circe._
import io.circe.parser._
import org.joda.time.DateTime
import org.joda.time.format.DateTimeFormat
import scala.util.control.NonFatal

object CirceDateTimeDecoder extends App {

  val dateFormatter = DateTimeFormat.forPattern("yyyyMMdd")
  implicit val decodeDateTime: Decoder[DateTime] = Decoder.decodeString.emap { s =>
    try {
      Right(DateTime.parse(s, dateFormatter))
    } catch {
      case NonFatal(e) => Left(e.getMessage)
    }
  }

  case class Model(date: DateTime)
  val str = """{"date": "20180101"}"""
  val data: Either[Error, Model] = decode[Model](str)
  data match {
    case Right(model) => println(model)
    case Left(e) => System.err.println(e)
  }

}