如何在Joda中使用JDK GregorianCalendar对象日期

问题描述

我正在尝试使用Joda库，因为Java本机方法的计数周期令人头疼，而且我的所有尝试都给出了不准确的结果

I'm trying to use Joda library since count periods with Java native methods is a pain in the neck and all my attempts give unprecise results

我看过这个样本

int n = Days.daysBetween(start.toLocalDate(), end.toLocalDate()).getDays();

由于我所有的班级都管理GregorianCalendar，因此我需要一种计算支持GregorianCalendar的天数的方法，例如

since all my classes manage GregorianCalendar, I need that method that counts the days support GregorianCalendar, something like

 public int countDays(GregorianCalendar start, GregorianCalendar end){
     //convert to joda start and end
     ...
     return Days.daysBetween(start.toLocalDate(), end.toLocalDate()).getDays();
 }

所以我的问题是:如何将GregorianCalendar对象转换和重新转换为Joda管理的对象而没有副作用?

So my question:How to convert and reconvert GregorianCalendar object to the object managed by Joda without side effects?

推荐答案

使用带有Object的DateTime构造函数，该构造函数可以"包括ReadableInstant，字符串，日历和日期."它还特别提到了GregorianCalendar

Use the DateTime constructor that takes an Object, which can "include ReadableInstant, String, Calendar and Date." It specifically mentions GregorianCalendar, as well.

public int countDays(GregorianCalendar gregStart, GregorianCalendar gregEnd) {
    DateTime start = new DateTime(gregStart);
    DateTime end = new DateTime(gregEnd);
    return Days.daysBetween(start, end).getDays();
}

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