Json4s date to unixtimestamp

Question

How to create wrapper for Json4s? Default json4s formater date converted all to SimpleDateFormat. I want convert all date field to unixtime format.

what do you mean "unixtime" format? a unix timestamp? ie: a signed 32bit integer? — Marc B, Jan 07 '15 at 16:56
yes. long interpretation of date. https://en.wikipedia.org/wiki/Unix_time such as new Date().getTime() — Rinat Mukhamedgaliev, Jan 07 '15 at 16:58

edi · Accepted Answer · 2015-01-09T13:36:38.047

-1

You should be able to implement your own Formats. Here is a simplified example, which is based on the SerializationExamples.

EDIT: updated example

import java.util.Date
import org.json4s._
import org.json4s.jackson.Serialization

object Main extends App {

  implicit val formats = new DefaultFormats {
    override val dateFormat: DateFormat = new DateFormat {
      override def parse(s: String): Option[Date] = Some(new Date(s.toLong * 1000))
      override def format(d: Date): String = (d.getTime/1000).toString
    }
  }

  case class Lotto(id: Long, drawDate: Date)

  val lotto = Lotto(3L, new Date())

  val ser: String = Serialization.write(lotto)
  println(ser) // prints value 'drawDate' as unix time
  println(Serialization.read[Lotto](ser)) // prints deserialized Lotto instance
}

edited Jan 09 '15 at 13:36

answered Jan 07 '15 at 19:29

edi

3,112
21
16

Serius? I can do it in DTO level with convert all dates to LONG "new Date().getTime" – Rinat Mukhamedgaliev Jan 11 '15 at 21:45
Then why don't you do it? What's the point of your question then, when not changing the serialization format of dates? – edi Jan 11 '15 at 21:52

score -1 · Answer 2 · answered Jan 09 '15 at 13:21

-1

If your project allow it... instead of writing any new piece of code, why no to use moment.js. It certainly give you the option to have unix output there.

unix function in moment.js

answered Jan 09 '15 at 13:21

Chasky

60
6

I write not only JS. And string as dates sucks. – Rinat Mukhamedgaliev Jan 11 '15 at 21:50
momentjs is just a way to manipulate the date, you can always have it back for internal storing in date datatype. Down voter, nice to know the reason so I can try to improve the answer... which besides was more of a comment... but I didn't have the privileges before :) ... or to have a better non-opinion based question :) – Chasky Jan 14 '15 at 09:06

Json4s date to unixtimestamp

2 Answers2