java 使用特定模式将 Instant 格式化为字符串
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Formatting Instant to String with specific pattern
提问by RandomQuestion
I'm trying to format Instantto Stringwith a specific format. Based on the question here Format Instant to String, I'm doing this -
我试图格式Instant，以String与特定的格式。基于这里的问题Format Instant to String，我正在这样做 -
DateTimeFormatter formatter = DateTimeFormatter
.ofPattern("YYYY-MM-DD'T'hh:mm'Z'")
.withZone(ZoneOffset.UTC);
// Fails for current time with error 'Field DayOfYear cannot be printed as the
// value 148 exceeds the maximum print width of 2'
LocalDateTime
.ofInstant(Instant.now(), ZoneOffset.UTC)
.format(DATE_TIME_FORMATTER);
// But works for smaller values of Instant
LocalDateTime
.ofInstant(Instant.ofEpochMilli(604800000), ZoneOffset.UTC)
.format(DATE_TIME_FORMATTER));
Any suggestions on why is this happening?
关于为什么会发生这种情况的任何建议？
Thanks
谢谢
回答by Andreas
Pattern YYYY-MM-DD'T'hh:mm'Z'is wrong:
模式YYYY-MM-DD'T'hh:mm'Z'错误：
YYYY- week-based-year wrong: useuuuuyearMM- month-of-yearDD- day-of-year wrong: useddday-of-monthhh- clock-hour-of-am-pm (1-12) without AM/PM you probably wantHHhour-of-day (0-23)mm- minute-of-hour
YYYY- 基于周的年份 错误：使用uuuu年份MM- 每年的月份DD- 年日 错误：使用dd月日hh-clock-hour-of-am-pm (1-12) 没有 AM/PM 您可能想要HH一天中的小时 (0-23)mm- 分时
It's weird, because you even referenced a link that had the right pattern characters. Unless of course you thought upper- vs lower-case didn't matter, but if so, how did you think MM(month) vs mm(minute) worked?
这很奇怪，因为您甚至引用了具有正确模式字符的链接。当然，除非您认为大写与小写无关紧要，但如果是这样，您认为MM（月）与mm（分钟）如何工作？
You might want to actually read the documentation.
您可能想要实际阅读文档。
回答by T. Claverie
Take a look at the documentation of the DateTimeFormatter. So, Dstands for the day of the year, while dis the day of the month, which is what you want.
查看DateTimeFormatter的文档。因此，D代表一年d中的第几天，而代表月份中的第几天，这就是您想要的。
Plus, there are several formats that are already defined. The one you want is almost like DateTimeFormatter.ISO_INSTANT.
另外，已经定义了几种格式。你想要的几乎就像DateTimeFormatter.ISO_INSTANT.
