如何将LocalDateTime对象转换为包含时区的ISO字符串？

Question

我正在尝试将日期/时间字符串来回转换为LocalDateTime对象。我使用ThreeTenBp作为日期/时间库。

字符串 - ＆gt; LocalDateTime

val actual = LocalDateTime.parse("2016-12-27T08:15:05.674+01:00", 
                                 DateTimeFormatter.ISO_DATE_TIME)
val expected = LocalDateTime.of(2016, 12, 27, 8, 15, 5, 674000000)
assertThat(actual).isEqualTo(expected) // Successful

LocalDateTime - ＆gt;串

val dateTime = LocalDateTime.of(2016, 12, 27, 8, 15, 5, 674000000)
val actual  = dateTime.format(DateTimeFormatter.ISO_DATE_TIME)
assertThat(actual).isEqualTo("2016-12-27T08:15:05.674+01:00") // Fails

由于某种原因，时区丢失了：

  

预期：＆lt; ... 6-12-27T08：15：05.674 [+01：00]＆＃34;＆gt;但是：＆lt; ... 6-12-27T08：15：05.674 []＆＃34;＆gt;
  预计：＆＃34; 2016-12-27T08：15：05.674 + 01:00＆＃34;
  实际：＆＃34; 2016-12-27T08：15：05.674＆＃34;

Answer 1

LocalDateTime是偏移/时区不可知类。您需要OffsetDateTime课程。

字符串 - ＆gt; OffsetDateTime

val actual = OffsetDateTime.parse("2016-12-27T08:15:05.674+01:00", DateTimeFormatter.ISO_DATE_TIME)
val expected = OffsetDateTime.of(2016, 12, 27, 8, 15, 5, 674000000, ZoneOffset.of("+01:00"))
assertThat(actual).isEqualTo(expected)

OffsetDateTime - ＆gt;串

val dateTime = OffsetDateTime.of(2016, 12, 27, 8, 15, 5, 674000000, ZoneOffset.of("+01:00"))
val actual  = dateTime.format(DateTimeFormatter.ISO_DATE_TIME)
assertThat(actual).isEqualTo("2016-12-27T08:15:05.674+01:00")