scala 如何将时间格式化为 UTC 时区？
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How do I format time to UTC time zone?
提问by user626528
I have some date/time in a Date object; how can I format it to a string, so it represents appropriate date/time in UTCtime zone?
我在 Date 对象中有一些日期/时间；如何将其格式化为字符串，以便在UTC时区表示适当的日期/时间？
回答by Andrzej Jozwik
I'm in central europe TZ. It is my code with joda-time:
我在中欧TZ。这是我的 joda-time 代码：
scala> val myTz = DateTimeZone.getDefault()
myTz: org.joda.time.DateTimeZone = Europe/Warsaw
scala> val now = new Date()
now: java.util.Date = Tue Sep 23 12:06:05 CEST 2014
scala> val utcString = new DateTime(now).withZone(DateTimeZone.UTC).toString()
utcString: String = 2014-09-23T10:06:05.302Z
Java 8:
爪哇8：
Welcome to Scala version 2.11.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_20).
欢迎使用 Scala 版本 2.11.2（Java HotSpot(TM) 64 位服务器 VM，Java 1.8.0_20）。
scala> import java.time._
import java.time._
scala> val utcZoneId = ZoneId.of("UTC")
utcZoneId: java.time.ZoneId = UTC
scala> val zonedDateTime = ZonedDateTime.now
zonedDateTime: java.time.ZonedDateTime = 2014-09-24T09:45:31.165+02:00[Europe/Warsaw]
scala> val utcDateTime = zonedDateTime.withZoneSameInstant(utcZoneId)
utcDateTime: java.time.ZonedDateTime = 2014-09-24T07:45:31.165Z[UTC]
回答by Daniel Olszewski
The solution without Joda Time:
没有 Joda Time 的解决方案：
val date = new Date()
val format = new SimpleDateFormat()
format.setTimeZone(new SimpleTimeZone(SimpleTimeZone.UTC_TIME, "UTC"))
val dateAsString = format.format(date)
