Blog jcwutil - Implicit Object Formatter http://blog.joecwu.com/2015/07/scava-scala-jcwutil-objformatter.html

blog-Scala-jcwutil-ObjFormatter-datetime-sample.scala

import com.joecwu.jcwutil.ObjFormatter._

object TestApp {
  def run = {
    implicit def timeZone = TIMEZONE_UTC
    println(System.currentTimeMillis().toStringRFC3339)
    println(System.currentTimeMillis().toStringISO8601)
  }
}

blog-Scala-jcwutil-ObjFormatter-datetime-test.scala

package com.joecwu.jcwutil.test

import java.text.SimpleDateFormat
import java.util.{TimeZone, Locale}

import org.scalatest.FlatSpec
import com.joecwu.jcwutil.ObjFormatter._

import scalaz._, Scalaz._
/**
 * Test spec for ObjFormatter
 * Created by Joe on 2015/7/19.
 */
class ObjFormatterTest extends FlatSpec {
  private val SDF_RFC3339 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ENGLISH)
  private val SDF_ISO8601 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)

  behavior of "LongFormatter"
  it should "convert Long to Date(RFC3339) format:(yyyy-MM-dd'T'HH:mm:ss'Z')" in {
    implicit def timeZone = TIMEZONE_UTC
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_RFC3339.setTimeZone(TimeZone.getTimeZone("UTC"))
    val dateStr = SDF_RFC3339.format(date)
    assertResult(ts.toStringRFC3339)(dateStr)
  }
  it should "convert Long to Date(RFC3339) format:(yyyy-MM-dd'T'HH:mm:ss'Z') with TimeZone" in {
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_RFC3339.setTimeZone(TimeZone.getTimeZone("GMT+8"))
    val dateStr = SDF_RFC3339.format(date)
    implicit def timeZone = TimeZone.getTimeZone("GMT+8").some
    println(ts.toStringRFC3339)
    assertResult(ts.toStringRFC3339)(dateStr)
  }
  it should "convert Long to Date(ISO8601) format:(yyyy-MM-dd'T'HH:mm:ss.SSSXXX)" in {
    implicit def timeZone = TIMEZONE_UTC
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_ISO8601.setTimeZone(TimeZone.getTimeZone("UTC"))
    val dateStr = SDF_ISO8601.format(date)
    println(ts.toStringISO8601)
    assertResult(ts.toStringISO8601)(dateStr)
  }
  it should "convert Long to Date(ISO8601) format:(yyyy-MM-dd'T'HH:mm:ss.SSSXXX) with TimeZone" in {
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_ISO8601.setTimeZone(TimeZone.getTimeZone("GMT+8"))
    val dateStr = SDF_ISO8601.format(date)
    implicit def timeZone = TimeZone.getTimeZone("GMT+8").some
    println(ts.toStringISO8601)
    assertResult(ts.toStringISO8601)(dateStr)
  }

  behavior of "DateFormatter"
  it should "convert Long to Date(RFC3339) format:(yyyy-MM-dd'T'HH:mm:ss'Z')" in {
    implicit def timeZone = TIMEZONE_UTC
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_RFC3339.setTimeZone(TimeZone.getTimeZone("UTC"))
    val dateStr = SDF_RFC3339.format(date)
    assertResult(date.toStringRFC3339)(dateStr)
  }
  it should "convert Long to Date(ISO8601) format:(yyyy-MM-dd'T'HH:mm:ss.SSSXXX)" in {
    implicit def timeZone = TIMEZONE_UTC
    val ts = System.currentTimeMillis()
    val date = new java.util.Date(ts)
    SDF_ISO8601.setTimeZone(TimeZone.getTimeZone("UTC"))
    val dateStr = SDF_ISO8601.format(date)
    assertResult(date.toStringISO8601)(dateStr)
  }

}

blog-Scala-jcwutil-ObjFormatter-datetime.scala

package com.joecwu.jcwutil

import java.text.SimpleDateFormat
import java.util.{Locale, TimeZone}
import scalaz._, Scalaz._

/**
 * Created by Joe on 2015/7/19.
 */
object ObjFormatter {
  private val SDF_RFC3339 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ENGLISH)
  private val SDF_ISO8601 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX", Locale.ENGLISH)
  val TIMEZONE_UTC = TimeZone.getTimeZone("UTC").some

  implicit def LongFormatter(v:Long) = LongFormatHandler(v)
  implicit def DateFormatter(date : java.util.Date) = DateFormatHandler(date)

  protected case class LongFormatHandler(v:Long) {
    def toStringRFC3339(implicit timeZone:Option[TimeZone]) : String = DateFormatHandler(new java.util.Date(v)).toStringRFC3339
    def toStringISO8601(implicit timeZone:Option[TimeZone]) : String = DateFormatHandler(new java.util.Date(v)).toStringISO8601
  }

  protected case class DateFormatHandler(date:java.util.Date) {
    def toStringRFC3339(implicit timeZone:Option[TimeZone]) : String = {
      timeZone.map(SDF_RFC3339.setTimeZone)
      SDF_RFC3339.format(date)
    }
    def toStringISO8601(implicit timeZone:Option[TimeZone]) : String = {
      timeZone.map(SDF_ISO8601.setTimeZone)
      SDF_ISO8601.format(date)
    }
  }
}