首页 > 解决方案 > java时间戳用间隔计算重叠持续时间

问题描述

我有许多时间戳 ( start, end),它们定义了一个间隔,并希望有效地检查它们是否与另一个单个间隔重叠。如果是,计算重叠持续时间,否则返回 0。

间隔:18:00同一天到08:00第二天。

start                  | end
2018-01-02 14:59:18.922|2018-01-02 14:59:38.804
2018-01-02 18:32:59.348|2018-01-02 20:30:41.192
2018-01-02 01:54:59.363|2018-01-02 01:54:59.363
2018-01-03 00:10:38.831|2018-01-03 00:11:53.103

我不确定如何有效地定义第二天

编辑

LocalDate

有方法toInterval().overlaps(anotherInterval)。我只是不确定如何以通用方式获得拟合间隔(第二天 18:00 - 08:00),即无需手动读取YYYMMDD然后创建新对象。

编辑 2

toInterval仅存在于 jodatime - 不是java.time/ JSR-310。用 java.time 计算重叠持续时间的可行方法是什么?

https://stackoverflow.com/questions/325933/determine-whether-two-date-ranges-overlap

编辑3

jodaTime 的解决方案:

val begin = new DateTime(new java.sql.Timestamp().getTime())
val stop = new DateTime(new java.sql.Timestamp().getTime())
val i1 = new Interval(begin, stop)

val start = new DateTime(begin.year.get   , begin.monthOfYear.get, begin.dayOfMonth.get, startHour, 0, 0, 0);
val endIntermediate =stop.toDateTime.plusDays(1)
val end = new DateTime(endIntermediate.year.get   , endIntermediate.monthOfYear.get, endIntermediate.dayOfMonth.get, endHour, 0, 0, 0);
val i2 = new Interval(start, end)

val overlap = i1.overlap(i2)
val overlapDurationOrNull = overlap.toDuration

似乎有效,但仍然很笨拙。

标签: javatimeintervalsoverlapduration

解决方案


我相信以下方法为您提供了与您的 Joda-Time 解决方案等效的方法。

private static final LocalTime START = LocalTime.of(18, 0);
private static final LocalTime END = LocalTime.of(8, 0);

public static Duration overlap(ZonedDateTime currentStart, ZonedDateTime currentEnd) {
    ZonedDateTime singleIntervalStart = currentStart.with(START);
    ZonedDateTime singleIntervalEnd = currentStart.plusDays(1).with(END);
    if (currentEnd.isBefore(singleIntervalStart)) {
        // no overlap
        return Duration.ZERO;
    }
    ZonedDateTime overlapStart = currentStart.isBefore(singleIntervalStart)
            ? singleIntervalStart : currentStart;
    ZonedDateTime overlapEnd = currentEnd.isBefore(singleIntervalEnd)
            ? currentEnd : singleIntervalEnd;
    return Duration.between(overlapStart, overlapEnd);
}

为了使用您问题中的时间戳进行尝试,我正在使用以下实用程序方法:

private static void demo(String from, String to) {
    ZoneId zone = ZoneId.of("Atlantic/Stanley");
    Duration overlapDuration = overlap(LocalDateTime.parse(from).atZone(zone),
            LocalDateTime.parse(to).atZone(zone));
    System.out.println("" + from + " - " + to + ": " + overlapDuration);
}

现在我这样称呼它:

    demo("2018-01-02T14:59:18.922", "2018-01-02T14:59:38.804");
    demo("2018-01-02T18:32:59.348", "2018-01-02T20:30:41.192");
    demo("2018-01-02T01:54:59.363", "2018-01-02T01:54:59.363");
    demo("2018-01-03T00:10:38.831", "2018-01-03T00:11:53.103");

输出是:

2018-01-02T14:59:18.922 - 2018-01-02T14:59:38.804: PT0S
2018-01-02T18:32:59.348 - 2018-01-02T20:30:41.192: PT1H57M41.844S
2018-01-02T01:54:59.363 - 2018-01-02T01:54:59.363: PT0S
2018-01-03T00:10:38.831 - 2018-01-03T00:11:53.103: PT0S

在第一个示例中,14:59 在 18:00 之前,因此结果是重叠 0。在第二个示例中,整个间隔被计为重叠(近 2 小时)。请注意,在最后两个示例中,没有报告重叠,因为时间是 18:00 之前的几个小时。我不确定这是否是您想要的,因为时间也在 08:00 之前。


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