转换日期格式：Java 中的转换错误？

Question

我正在尝试将此日期转换为其他格式。不幸的是，未能成功解析日期并正确保留所有信息。

2017 年 12 月 6 日 07:14:56.656PM 至 2017-12-06 19:14:56.656

如果我尝试解析输入日期

LocalDateTime.parse("06-Dec-2017 07:14:56.656PM",
        DateTimeFormatter.ofPattern("D-MMM-yyyy HH:mm:ss.SSSa"));

我收到以下错误 - 不确定这是什么意思？

Exception in thread "main" java.time.format.DateTimeParseException: Text '06-Dec-2017 07:14:56.656PM' could not be parsed: Conflict found: Field MonthOfYear 1 differs from MonthOfYear 12 derived from 2017-01-06
    at java.time.format.DateTimeFormatter.createError(Unknown Source)
    at java.time.format.DateTimeFormatter.parse(Unknown Source)
    at java.time.LocalDateTime.parse(Unknown Source)
    at com.cordys.coe.alf.logger.DBLogger.main(DBLogger.java:366)
Caused by: java.time.DateTimeException: Conflict found: Field MonthOfYear 1 differs from MonthOfYear 12 derived from 2017-01-06
    at java.time.format.Parsed.crossCheck(Unknown Source)
    at java.time.format.Parsed.crossCheck(Unknown Source)

如果尝试

System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS")
        .format((new SimpleDateFormat("DD-MMM-yyyy HH:mm:ss.SSSa")
                .parse("06-Dec-2017 07:14:56.656PM"))));

它给出的以下内容令人困惑，而且可能不正确。 2017-01-06 07:14:56:656

Answer 1

您有 2 个问题

D应该是d

D represents day of year

d represents day-of-month

HH 应该是 hh

H represents hour-of-day (0-23)

h represents clock-hour-of-am-pm (1-12)

请将D-MMM-yyyy HH:mm:ss.SSSa改为d-MMM-yyyy hh:mm:ss.SSSa

有关详细信息，请查看 oracle docs

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