Java(Joda):从LocalDateTime午夜开始经过的秒数 [英] Java (Joda): Seconds from midnight of LocalDateTime

问题描述

我试图用这个:

secondsFromMidnight = Seconds.secondsBetween(localDateTime.toLocalDate(),    
    localDateTime).getSeconds();

，但会引发异常(请参见下文).我认为这是一种很好的方法，但是我尚未成功地使其适应我的情况.如果我这样写:

but it throws an exception (cf. below). I think this is a good approach, but I did not succeed in adapt it to my case yet. If I write this:

    DateTime dateTimeFromMidnight = new DateMidnight(localDateTime.getChronology()).toDateTime();
    Duration duration = new Duration(dateTimeFromMidnight, localDateTime.toDateTime());

它弄乱了时区(我少了1小时).

it messes up with time zones (I get 1 hour less).

如果您的解决方案还可以轻松适应小时，分钟等，那就是加分.

If your solution is also easily adaptable for hours, minutes and so on, that's a plus.

我绝对需要使用LocalDateTime作为输入类型，请不要与其他类一起发布解决方案.

I need absolutely to use LocalDateTime as input type, please do not post solutions with other classes.

Exception in thread "main" java.lang.IllegalArgumentException: ReadablePartial objects must have the same set of fields
at org.joda.time.base.BaseSingleFieldPeriod.between(BaseSingleFieldPeriod.java:92)
at org.joda.time.Seconds.secondsBetween(Seconds.java:124)

推荐答案

如果您想了解一天中的时间，以午夜后的秒数为单位，则只需使用

If you want to know the time of day, in seconds since midnight, it would be easiest to just use getMillisOfDay():

int secondsOfDay = localDateTime.getMillisOfDay() / 1000;

(如果确实要使用DateTimeConstants.MILLIS_PER_SECOND-在这种情况下，我认为每秒1000毫秒"的知识就很容易.)

(Use DateTimeConstants.MILLIS_PER_SECOND if you really want to - in this case I think the knowledge of "1000 milliseconds per second" is easy enough.)

您当然可以在几分钟和几小时内使用相同的方法.

You can use the same approach for minutes and hours, of course.

如果您确实希望将其作为期间，则可以使用LocalDateTime.withMillisOfDay(0)在同一天的午夜获取LocalDateTime，例如

If you really want it as a period, you could use LocalDateTime.withMillisOfDay(0) to obtain a LocalDateTime at midnight of the same day, e.g.

secondsFromMidnight = Seconds.secondsBetween(localDateTime.withMillisOfDay(0), 
                                             localDateTime)
                             .getSeconds();

...但是我个人可能只使用getMillisOfDay.

... but personally I'd probably just use getMillisOfDay.

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