添加几天到JodaTime Instant [英] Adding a number of days to a JodaTime Instant

问题描述

我正在尝试编写一个简单的实用程序方法，用于在Joda时间添加一天的天数即时。这是我的第一个刺。

I'm trying to write a simple utility method for adding aninteger number of days to a Joda time instant. Here is my first stab.

/**
 * Adds a number of days specified to the instant in time specified.
 *
 * @param instant - the date to be added to
 * @param numberOfDaysToAdd - the number of days to be added to the instant specified
 * @return an instant that has been incremented by the number of days specified
 */
public static Instant addNumberOfDaysToInstant(final Instant instant, final int numberOfDaysToAdd) {
    Days days = Days.days(numberOfDaysToAdd);
    Interval interval = new Interval(instant, days);
    return interval.getEnd().toInstant();
}

大部分工作正常，除非你考虑例子的天数会带您穿越BST / GMT边界。这是一个小例子。

This works fine for the most part except when you consider the example when the number of days added takes you across the BST / GMT boundary. Here is a small example.

public class DateAddTest {

/ **
*用于输入和输出的区域
* /
private static final DateTimeZone ZONE = DateTimeZone.forId（Europe / London）;

/** * Zone to use for input and output */ private static final DateTimeZone ZONE = DateTimeZone.forId("Europe/London");

/**
 * Formatter used to translate Instant objects to & from strings.
 */
private static final DateTimeFormatter FORMATTER = DateTimeFormat.forPattern(DATE_FORMAT).withZone(ZONE);


/**
 * Date format to be used
 */
private static final String DATE_FORMAT = "dd/MM/yyyy";


public static void main(String[] args) {

 DateTime dateTime = FORMATTER.parseDateTime("24/10/2009");
 Instant toAdd = dateTime.toInstant();
 Instant answer = JodaTimeUtils.addNumberOfDaysToInstant(toAdd, 2);

 System.out.println(answer.toString(FORMATTER)); //25/10/2009
}

}

我认为这个问题是因为间隔没有涉及到它跨越bst边界的事实。

I think this problem is because the interval does not take into acount the fact that it has crossing the bst boundary. Any ideas of a better way to implement this would be appreciated.

推荐答案

这是选择的解决方案。

/**
* Zone to use for input and output
*/
private static final DateTimeZone ZONE = DateTimeZone.forId("Europe/London");

/**
 * Adds a number of days specified to the instant in time specified.
 *
 * @param instant - the date to be added to
 * @param numberOfDaysToAdd - the number of days to be added to the instant specified
 * @return an instant that has been incremented by the number of days specified
 */
public static Instant addNumberOfDaysToInstant(final Instant instant, final int numberOfDaysToAdd) {
    return instant.toDateTime(ZONE).withFieldAdded(DurationFieldType.days(), numberOfDaysToAdd).toInstant();
}

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