使用Java 8的给定日期（UTC日期）和当前日期（以天为单位）之间的差异

Question

String dateString = "2019-06-18T16:23:41.575 UTC";
final DateTimeFormatter formatter1 = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS 'UTC'").withZone(ZoneId.of("UTC"));
OffsetDateTime parsedDate  = OffsetDateTime.parse(dateString, formatter1);
System.out.println("======================:"+parsedDate.format(formatter1));


OffsetDateTime currentUTC = OffsetDateTime.now(ZoneOffset.UTC);
System.out.println("Until (with crono): " + parsedDate.until(currentUTC, ChronoUnit.DAYS));

我需要int中的结果（即天数）。

offsetdatetime parsedDate=offsetdatetime.parse（dateString,formatter1)；这一行抛出一个异常，其中包含以下堆栈跟踪：

Exception in thread "main" java.time.format.DateTimeParseException: Text '2019-06-18T16:23:41.575 UTC' could not be parsed: Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1560875021},ISO,UTC resolved to 2019-06-18T16:23:41.575 of type java.time.format.Parsed
    at java.base/java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1959)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1894)
    at java.base/java.time.OffsetDateTime.parse(OffsetDateTime.java:402)
    at thiagarajanramanathan.misc.App.main(App.java:86)
Caused by: java.time.DateTimeException: Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1560875021},ISO,UTC resolved to 2019-06-18T16:23:41.575 of type java.time.format.Parsed
    at java.base/java.time.OffsetDateTime.from(OffsetDateTime.java:370)
    at java.base/java.time.format.Parsed.query(Parsed.java:235)
    at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1890)
    ... 3 more
Caused by: java.time.DateTimeException: Unable to obtain ZoneOffset from TemporalAccessor: {InstantSeconds=1560875021},ISO,UTC resolved to 2019-06-18T16:23:41.575 of type java.time.format.Parsed
    at java.base/java.time.ZoneOffset.from(ZoneOffset.java:348)
    at java.base/java.time.OffsetDateTime.from(OffsetDateTime.java:359)
    ... 5 more

Answer 1

从下面的线程中可以看到：无法从TemporalAccessor获取OffsetDateTime
，我更改了以下行：

//OffsetDateTime parsedDate  = OffsetDateTime.parse(dateString, formatter1);
ZonedDateTime parsedDate = ZonedDateTime.parse(dateString, formatter1);

当使用此修改运行代码时，我可以得到以下结果

对于“世界协调时2019-06-18T16:23:41.575”：

======================:2019-06-17T16:23:41.575 UTC
Until (with crono): 0

======================:2019-06-17T16:23:41.575 UTC
Until (with crono): 1