如何在Joda中使用JDK GregorianCalendar对象日期 [英] How to use JDK GregorianCalendar object dates with Joda

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"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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