Mongo DateTime Parser in Scala

gistfile1.txt

package models

import play.api.libs.json._
import org.joda.time.{DateTimeZone, DateTime, LocalDateTime}
import reactivemongo.bson.BSONDateTime
import reactivemongo.bson.BSONReader
import reactivemongo.bson.BSONWriter

object MongoDateTime {

  implicit val localDateTimeRead: Reads[LocalDateTime] =
    (__ \ "$date").read[Long].map { dateTime => new LocalDateTime(dateTime, DateTimeZone.UTC) }


  implicit val localDateTimeWrite: Writes[LocalDateTime] = new Writes[LocalDateTime] {
    def writes(dateTime: LocalDateTime): JsValue = Json.obj(
      "$date" -> dateTime.toDateTime(DateTimeZone.UTC).getMillis
    )
  }

  implicit val dateTimeRead: Reads[DateTime] =
    (__ \ "$date").read[Long].map { dateTime =>
      new DateTime(dateTime, DateTimeZone.UTC)
    }


  implicit val dateTimeWrite: Writes[DateTime] = new Writes[DateTime] {
    def writes(dateTime: DateTime): JsValue = Json.obj(
      "$date" -> dateTime.getMillis
    )
  }

  implicit val dateTimeFormats = Format(dateTimeRead, dateTimeWrite)
  implicit val localDateTimeFormats = Format(localDateTimeRead, localDateTimeWrite)

  implicit object DatetimeReader extends BSONReader[BSONDateTime, DateTime] {
    def read(bson: BSONDateTime): DateTime = new DateTime(bson.value)
  }

  implicit object DatetimeWriter extends BSONWriter[DateTime, BSONDateTime] {
    def write(t: DateTime): BSONDateTime = BSONDateTime(t.getMillis)
  }

}