如何将 Twitter API 日期解析为 java.time.Instant？

Question

I am trying to parse the dates that come from the Twitter API into the new Instant class from Java 8. FYI, this is the format Wed Aug 09 17:11:53 +0000 2017 .

I don't want to deal with / set a time zone, as one is specified in the string already. I just want an Instant instance.

Answer 1

Follow the documentation of DateTimeFormatter :

    DateTimeFormatter dtf 
            = DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss X uuuu", Locale.ROOT);
    Instant asInstant = OffsetDateTime.parse(dateStr, dtf).toInstant();

With your example string the result is an Instant of

2017-08-09T17:11:53Z

It seems from the Twitter documentation that offset will always be +0000 . Depending on how strongly you trust this to be the case, you may use small x or capital Z instead of capital X in the format pattern. If you want stricter validation, you may also check that the OffsetDateTime 's .getOffset().equals(ZoneOffset.UTC) yields true before you convert to Instant .

Answer 2

找到解决方案

Instant.from(DateTimeFormatter.ISO_OFFSET_DATE_TIME.parse(dateStr))