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我正在使用 Joda 时间来验证带有时区的时间戳。当我通过无效的日期或时间时，它按预期工作。例如，当我以秒为单位传递 99 时，它给出了以下错误：

Exception in thread "main" org.joda.time.IllegalFieldValueException: Cannot  
parse "20131231235999+00": Value 99 for secondOfMinute must be in the range [0,59]

我期待它会抛出类似的异常，因为我也通过了无效的时区。我期待 UTC 偏移值小于 -12 且大于 +14 小时（http://en.wikipedia.org/wiki/List_of_time_zones_by_UTC_offset）。当偏移值超过 23 小时时，它确实给出了以下错误。

Exception in thread "main" java.lang.IllegalArgumentException: Invalid
format: "20131231235959+24" is malformed at "24"

我想我遗漏了一些东西，因为它表明 24 小时内出现错误。有人可以解释为什么它允许偏移值 < -12 和 > 14 小时。

下面给出了一个示例程序，输出不同的偏移量：

public static void main(String[] args) throws ParseException, DatatypeConfigurationException
{
    DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyyMMddHHmmssZ").withZoneUTC();
    String dateString = "";

    for (int i = 0; i < 24; i++)
    {
        if (i < 10)
        {
            dateString = "20131231235959+0" + i;
            DateTime dt1 = dtf.parseDateTime(dateString);
            System.err.println(dateString + " = " + dt1);
        }
        else
        {
            dateString = "20131231235959+" + i;
            DateTime dt1 = dtf.parseDateTime(dateString);
            System.err.println(dateString + " = " + dt1);
        }
    }


    for (int i = 0; i < 24; i++)
    {
        if (i < 10)
        {
            dateString = "20131231235959-0" + i;
            DateTime dt1 = dtf.parseDateTime(dateString);
            System.err.println(dateString + " = " + dt1);
        }
        else
        {
            dateString = "20131231235959-" + i;
            DateTime dt1 = dtf.parseDateTime(dateString);
            System.err.println(dateString + " = " + dt1);
        }
    }
}

Output:

20131231235959+00 = 2013-12-31T23:59:59.000Z  20131231235959-00 = 2013-12-31T23:59:59.000Z
20131231235959+01 = 2013-12-31T22:59:59.000Z  20131231235959-01 = 2014-01-01T00:59:59.000Z
20131231235959+02 = 2013-12-31T21:59:59.000Z  20131231235959-02 = 2014-01-01T01:59:59.000Z
20131231235959+03 = 2013-12-31T20:59:59.000Z  20131231235959-03 = 2014-01-01T02:59:59.000Z
20131231235959+04 = 2013-12-31T19:59:59.000Z  20131231235959-04 = 2014-01-01T03:59:59.000Z
20131231235959+05 = 2013-12-31T18:59:59.000Z  20131231235959-05 = 2014-01-01T04:59:59.000Z
20131231235959+06 = 2013-12-31T17:59:59.000Z  20131231235959-06 = 2014-01-01T05:59:59.000Z
20131231235959+07 = 2013-12-31T16:59:59.000Z  20131231235959-07 = 2014-01-01T06:59:59.000Z
20131231235959+08 = 2013-12-31T15:59:59.000Z  20131231235959-08 = 2014-01-01T07:59:59.000Z
20131231235959+09 = 2013-12-31T14:59:59.000Z  20131231235959-09 = 2014-01-01T08:59:59.000Z
20131231235959+10 = 2013-12-31T13:59:59.000Z  20131231235959-10 = 2014-01-01T09:59:59.000Z
20131231235959+11 = 2013-12-31T12:59:59.000Z  20131231235959-11 = 2014-01-01T10:59:59.000Z
20131231235959+12 = 2013-12-31T11:59:59.000Z  20131231235959-12 = 2014-01-01T11:59:59.000Z
20131231235959+13 = 2013-12-31T10:59:59.000Z  20131231235959-13 = 2014-01-01T12:59:59.000Z
20131231235959+14 = 2013-12-31T09:59:59.000Z  20131231235959-14 = 2014-01-01T13:59:59.000Z
20131231235959+15 = 2013-12-31T08:59:59.000Z  20131231235959-15 = 2014-01-01T14:59:59.000Z
20131231235959+16 = 2013-12-31T07:59:59.000Z  20131231235959-16 = 2014-01-01T15:59:59.000Z
20131231235959+17 = 2013-12-31T06:59:59.000Z  20131231235959-17 = 2014-01-01T16:59:59.000Z
20131231235959+18 = 2013-12-31T05:59:59.000Z  20131231235959-18 = 2014-01-01T17:59:59.000Z
20131231235959+19 = 2013-12-31T04:59:59.000Z  20131231235959-19 = 2014-01-01T18:59:59.000Z
20131231235959+20 = 2013-12-31T03:59:59.000Z  20131231235959-20 = 2014-01-01T19:59:59.000Z
20131231235959+21 = 2013-12-31T02:59:59.000Z  20131231235959-21 = 2014-01-01T20:59:59.000Z
20131231235959+22 = 2013-12-31T01:59:59.000Z  20131231235959-22 = 2014-01-01T21:59:59.000Z
20131231235959+23 = 2013-12-31T00:59:59.000Z  20131231235959-23 = 2014-01-01T22:59:59.000Z

谢谢，

阿南德

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1 回答 1

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来自 ISO 8601：

当需要表示当地时间与当天UTC的差异时，差异的表示可以用小时和分钟表示，也可以只用小时表示。如果当地时间早于或等于当天的 UTC，则应表示为正数（即带前导加号 [+]），如果晚于 UTC，则应表示为负数（即带前导减号 [-]）天。仅当时间刻度之间的差异恰好是整数小时时，才可以省略差异的分钟时间元素。基本格式：±hhmm 示例：+0100 ±hh +01 扩展格式：±hh:mm 示例：+01:00

它没有明确提到范围，但它们确实使用了与小时相同的字母。鉴于joda 时间默认使用 ISO 8601，似乎暗示偏移的范围与时间表示的小时值的范围相同。

于 2013-04-04T17:04:20.360 回答