java 我的 Joda 时间格式模式在解析的 DateTime 输出中生成“T”和“Z”是否不正确？
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Is my Joda Time format pattern incorrect to produce a `T` and `Z` inside the parsed DateTime output?
提问by Tree
Using Joda Time's pattern syntaxbelow, this input string:
使用以下Joda Time 的模式语法，此输入字符串：
Sunday, January 09, 2011 6:15:00 PM
becomes this datetime:
成为这个日期时间：
2011-01-09T06:15:00.000Z
Code:
代码：
String start = "Sunday, January 09, 2011 6:15:00 PM";
DateTimeFormatter parser1 =
DateTimeFormat.forPattern("EEEE, MMMM dd, yyyy H:mm:ss aa");
DateTime startTime = parser1.parseDateTime(start);
Is this format pattern incorrect? If not, what are the Tand Zdoing inside the DateTime output?
这种格式模式不正确吗？如果不是，DateTime 输出中的T和Z做什么？
2011-01-09T06:15:00.000Z
回答by cheekoo
T: Denotes start of "time part" of the string. Zone: 'Z' outputs offset. I suppose in thise case is GMT. Source:http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html
T：表示字符串“时间部分”的开始。区域：'Z' 输出偏移。我想在这种情况下是格林威治标准时间。来源：http: //joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html
I always use this format string: yyyy-MM-dd'T'HH:mm:ss.SSSZ
我总是使用这种格式字符串： yyyy-MM-dd'T'HH:mm:ss.SSSZ
And, yes, they are not incorrect, if they are present in your string.
而且，是的，如果它们出现在您的字符串中，它们并没有错。
回答by Jon Skeet
You've only shown the parsingcode - not how you've converted the DateTimevalue back to a String.
您只显示了解析代码 - 而不是您如何将DateTime值转换回String.
I strongly suspect you're just calling toString(), which use the default DateTimeISO8601 format.
我强烈怀疑您只是在调用toString()，它使用默认的DateTimeISO8601 格式。
Don't forget that a DateTimevalue represents an instant in time in a particular time zone and calendar system - it has no concept of format patterns. The "T" and "Z" aren't in the DateTimevalue - they're just in the default representationof the value. It's like when you convert an intto a string - it happens to use decimal, but the number itself is just a number.
不要忘记一个DateTime值代表特定时区和日历系统中的一个瞬间——它没有格式模式的概念。“T”和“Z”不在DateTime值中——它们只是在值的默认表示中。就像将 an 转换int为字符串一样 - 它恰好使用十进制，但数字本身只是一个数字。
If you want to format a DateTimein a specific way, you should use
如果要以DateTime特定方式格式化 a ，则应使用
String text = formatter.print(startTime);
回答by Carlos Vilchez
Instead of creating your own formatter, you can use one predefined by Joda time.
You will find them in org.joda.time.format.ISODateTimeFormat.
您可以使用 Joda 时间预定义的格式化程序，而不是创建自己的格式化程序。您会在org.joda.time.format.ISODateTimeFormat.
In fact, in your case I would use ISODateTimeFormat.basicDateTimeNoMillisformatter. I think it has the pattern you were looking for: yyyyMMdd'T'HHmmssZ
事实上，在你的情况下，我会使用ISODateTimeFormat.basicDateTimeNoMillis格式化程序。我认为它具有您正在寻找的模式：yyyyMMdd'T'HHmmssZ
