OffsetDateTime解析

Question

需要解析格式2016-06-24T13:39:44.687680中的日期时间。

第一步使用，尝试分析时间没有微秒与行。

System.out.println(OffsetDateTime.parse("2011-12-03T10:15:30", DateTimeFormatter.ISO_LOCAL_DATE_TIME));

有异常

Exception in thread "main" java.time.format.DateTimeParseException: Text '2011-12-03T10:15:30' could not be parsed: Unable to obtain OffsetDateTime from TemporalAccessor: {},ISO resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1920)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1855)
    at java.time.OffsetDateTime.parse(OffsetDateTime.java:402)
    at timeread.TimeReading.main(TimeReading.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.time.DateTimeException: Unable to obtain OffsetDateTime from TemporalAccessor: {},ISO resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.OffsetDateTime.from(OffsetDateTime.java:370)
    at java.time.format.Parsed.query(Parsed.java:226)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
    ... 7 more
Caused by: java.time.DateTimeException: Unable to obtain ZoneOffset from TemporalAccessor: {},ISO resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.ZoneOffset.from(ZoneOffset.java:348)
    at java.time.OffsetDateTime.from(OffsetDateTime.java:359)
    ... 9 more

尝试将DateTimeFormatter与TimeZone结合使用

System.out.println(OffsetDateTime.parse("2011-12-03T10:15:30", DateTimeFormatter.ISO_LOCAL_DATE_TIME.withZone(ZoneId.systemDefault())));

类似的异常

Exception in thread "main" java.time.format.DateTimeParseException: Text '2011-12-03T10:15:30' could not be parsed: Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1322892930},ISO,Europe/Moscow resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1920)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1855)
    at java.time.OffsetDateTime.parse(OffsetDateTime.java:402)
    at timeread.TimeReading.main(TimeReading.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.time.DateTimeException: Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1322892930},ISO,Europe/Moscow resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.OffsetDateTime.from(OffsetDateTime.java:370)
    at java.time.format.Parsed.query(Parsed.java:226)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
    ... 7 more
Caused by: java.time.DateTimeException: Unable to obtain ZoneOffset from TemporalAccessor: {InstantSeconds=1322892930},ISO,Europe/Moscow resolved to 2011-12-03T10:15:30 of type java.time.format.Parsed
    at java.time.ZoneOffset.from(ZoneOffset.java:348)
    at java.time.OffsetDateTime.from(OffsetDateTime.java:359)
    ... 9 more

Answer 1

OffsetDateTime.parse需要一个包含偏移量(+/-hh:mm)的字符串，而"2011-12-03T10:15:30"没有。用LocalDateTime.parse解析它，并使用OffsetDateTime.of转换结果。

Answer 2

OffsetDateTime是带有偏移量的日期时间的表示形式.要创建一个OffsetDateTime，需要一个区域偏移量。

在ISO-8601日历系统中与UTC/格林威治相抵的日期时间，如2007-12-03T10:15:30+01:00。

请参阅：https://docs.oracle.com/javase/8/docs/api/java/time/OffsetDateTime.html

例如：

OffsetDateTime.parse("2011-12-03T10:15:30+01:00", DateTimeFormatter.ISO_OFFSET_DATE_TIME);

如果尝试使用ZoneId解析日期时间，则应该使用ZonedDateTime。

在ISO-8601日历系统中有时区的日期时间，如2007-12-03T10:15:30+01:00欧洲/巴黎。

请参阅：https://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html

例如：

ZonedDateTime.parse("2011-12-03T10:15:30", DateTimeFormatter.ISO_LOCAL_DATE_TIME.withZone(ZoneId.systemDefault()));

如果您需要的是在ISO-8601日历系统中没有时区的日期时间，则可以使用LocalDateTime。

在ISO-8601日历系统中没有时区的日期时间，如2007-12-03T10:15:30。

请参阅：https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html

例如：

LocalDateTime.parse("2016-06-24T13:39:44.687680", DateTimeFormatter.ISO_LOCAL_DATE_TIME);

Answer 3

我有一个稍微不符合标准的ISO(!)解析2021-01-14T09:25:33+0000的日期

一个标准的DateTimeFormatter.ISO_OFFSET_DATE_TIME不会处理它，但是DateTimeFormatterBuilder可以用来根据现有的DateTimeFormatterBuilder格式来创建它。

DateTimeFormatter customFormatter = new DateTimeFormatterBuilder()
   .append(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
   .appendOffset("+HHMM","Z")
   .toFormatter();

重要的是.appendOffset()方法，因为使用.ofPattern()似乎不适用于偏移量解析。