乔达时间:将UTC转换为本地时间 [英] Joda Time: Convert UTC to local

问题描述

我想将Joda Time UTC DateTime对象转换为本地时间.

I want to convert a Joda Time UTC DateTime object to local time.

这是一种行之有效的方法，似乎很奏效.但是必须有更好的方法.

Here's a laborious way to do it which seems to work. But there must be a better way.

这是没有周围声明的代码(在Scala中):

Here's the code (in Scala) without surrounding declarations:

    val dtUTC = new DateTime("2010-10-28T04:00")
    println("dtUTC = " + dtUTC)
    val dtLocal = timestampLocal(dtUTC)
    println("local = " + dtLocal)

 def timestampLocal(dtUTC: DateTime): String = {
    // This is a laborious way to convert from UTC to local. There must be a better way.
    val instantUTC = dtUTC.getMillis
    val localDateTimeZone = DateTimeZone.getDefault
    val instantLocal = localDateTimeZone.convertUTCToLocal(instantUTC)
    val dtLocal = new DateTime(instantLocal)
    dtLocal.toString
  }

这是输出:

dtUTC = 2010-10-28T04:00:00.000 + 11:00 本地= 2010-10-28T15:00:00.000 + 11:00

dtUTC = 2010-10-28T04:00:00.000+11:00 local = 2010-10-28T15:00:00.000+11:00

推荐答案

这是我在当前项目中使用的内容.

Here's what I use on a current project.

val marketCentreTime = timeInAnotherTimezone.withZone(DateTimeZone.forID("Australia/Melbourne"))

有帮助吗?

在当前TZ中，这需要花费一些时间，并转换为布里斯班时间.您可以使用相同的原理.

Here's something that takes a time in the current TZ and converts to Brisbane time. You can use the same principle.

Welcome to Scala version 2.8.0.final (Java HotSpot(TM) Client VM, Java 1.6.0_21).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import org.joda.time._                                            
import org.joda.time._

scala> def timestampBrisbane(date: DateTime): String = {                      
     |   date.withZone(DateTimeZone.forID("Australia/Brisbane")).toString 
     | }
timestampBrisbane: (date: org.joda.time.DateTime)String

scala> val date = new DateTime
date: org.joda.time.DateTime = 2010-10-28T16:22:03.481+11:00

scala> val dateBrisbane = timestampBrisbane(date)
dateBrisbane: String = 2010-10-28T15:22:03.481+10:00

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