kotlin - 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目的。我正在使用 ThreeTenBp作为日期/时间库。

字符串 -> 本地日期时间

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

本地日期时间 -> 字符串

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:

expected: <...6-12-27T08:15:05.674[+01:00]"> but was:<...6-12-27T08:15:05.674[]">
Expected :"2016-12-27T08:15:05.674+01:00"
Actual :"2016-12-27T08:15:05.674"

Answer 1

LocalDateTime是偏移/时区不可知类。您需要一个 OffsetDateTime类(class)。

字符串 -> 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 -> 字符串

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")