How to convert the dd/mm/yyyy to yyyymmdd in scala by using joda time

Question

How can I convert the dd/mm/yyyy to yyyymmdd format and also dd/m/yyyy to yyyymmdd format by using joda time in Scala.

am using this dependency

 "joda-time" % "joda-time" % "2.9.9",

Answer 1

This answer already answers your question in Java, but here it is translated into Scala:

import org.joda.time.DateTime
import org.joda.time.format.{DateTimeFormat, DateTimeFormatter}

// define original date format
val originalFormat: DateTimeFormatter = DateTimeFormat.forPattern("dd/MM/yyyy")
val input: DateTime = originalFormat.parseDateTime("02/09/2017")

// define new format
val newFormat: DateTimeFormatter = DateTimeFormat.forPattern("yyyyMMdd")
val output: String = newFormat.print(input) // 20170902

This code will already account for missing a leading 0 from your date (ie it will see 02/9/2017 and 2/9/2017 as the same thing). It will not predict missing parts of the year though, so 2/9/17 will be outputted as 00170902 instead of 20170902.

As the answer I linked to earlier mentions though, you can just use java.time to do the same thing:

import java.time.LocalDate
import java.time.format.DateTimeFormatter

val originalFormat = DateTimeFormatter.ofPattern("dd/MM/yyyy")
val input = LocalDate.parse("02/09/2017", originalFormat)
val newFormat = DateTimeFormatter.ofPattern("yyyyMMdd")
val output = input.format(newFormat)

Answer 2

import org.joda.time.DateTime
import org.joda.time.format._

val fmt = DateTimeFormat.forPattern("dd/mm/yyyy")
val dt = fmt.parseDateTime("02/02/2017")
val fmt2 = DateTimeFormat.forPattern("yyyymmdd")
fmt2.print(dt)