Question

我有多个日期范围。我想检查它们是否在javascript中重叠。当只有两个很容易时，我使用：

if(start_times1 <= end_times2 && end_times1 >= start_times2) {}

但是当有超过2个日期范围时，公式是什么？

Answer 1

您可以使用for

的嵌套arguements循环

function dateRangeOverlaps(a_start, a_end, b_start, b_end) {
    if (a_start <= b_start && b_start <= a_end) return true; // b starts in a
    if (a_start <= b_end   && b_end   <= a_end) return true; // b ends in a
    if (b_start <  a_start && a_end   <  b_end) return true; // a in b
    return false;
}
function multipleDateRangeOverlaps() {
    var i, j;
    if (arguments.length % 2 !== 0)
        throw new TypeError('Arguments length must be a multiple of 2');
    for (i = 0; i < arguments.length - 2; i += 2) {
        for (j = i + 2; j < arguments.length; j += 2) {
            if (
                dateRangeOverlaps(
                    arguments[i], arguments[i+1],
                    arguments[j], arguments[j+1]
                )
            ) return true;
        }
    }
    return false;
}

Answer 2

以下是保罗发布的内容的精炼版本：

添加了过滤器和空检查以允许任意数量的条目
更改了逻辑，以便可以将其应用于数组。例如：[{“ from”：值，“ to”：值}]
调整重叠检查以允许结束时间和开始时间相同

脚本：

function dateRangeOverlaps(a_start, a_end, b_start, b_end) {
    if (a_start < b_start && b_start < a_end) return true; // b starts in a
    if (a_start < b_end   && b_end   < a_end) return true; // b ends in a
    if (b_start <  a_start && a_end   <  b_end) return true; // a in b
    return false;
}

function multipleDateRangeOverlaps(timeEntries) {
    let i = 0, j = 0;
    let timeIntervals = timeEntries.filter(entry => entry.from != null && entry.to != null && entry.from.length === 8 && entry.to.length === 8);

    if (timeIntervals != null && timeIntervals.length > 1)
    for (i = 0; i < timeIntervals.length - 1; i += 1) {
        for (j = i + 1; j < timeIntervals.length; j += 1) {
                if (
                dateRangeOverlaps(
            timeIntervals[i].from.getTime(), timeIntervals[i].to.getTime(),
            timeIntervals[j].from.getTime(), timeIntervals[j].to.getTime()
                    )
                ) return true;
            }
        }
   return false;
}

Answer 3

以下代码来自我的项目，也许它会对您有所帮助：

function dateRangeOverlaps(startDateA, endDateA, startDateB, endDateB) {

    if ((endDateA < startDateB) || (startDateA > endDateB)) {
        return null
    }

    var obj = {};
    obj.startDate = startDateA <= startDateB ? startDateB : startDateA;
    obj.endDate = endDateA <= endDateB ? endDateA : endDateB;

    return obj;
}

Answer 4

递归不会太难。创建一个方法overlap，返回两个日期的重叠日期范围。然后在您的hasOverlap(list dates)方法中，如果列表是两个项目，则很简单，否则返回hasoverlap(overlap(dates[0], dates[1]), rest of list)

Answer 5

//存储现有日期以进行比较

public multipleExistingDates=[
         {startDate:'02/03/2020 05:00:00',endDate:'02/03/2020 05:30:00'},
         {startDate:02/04/2020 05:00:00'',endDate:'02/05/2020 05:00:00'},]

/ 要与现有日期进行比较的日期，以检查新日期是否与现有日期重叠 /

public checkOverlappingDsates(startDate:Date, endDate:Date):boolean{
  return this.multipleExistingDates.some((elem)=>{
       return( !((moment(endDate).diff(moment(elem.startDate))) < 0 || 
              (moment(startDate).diff(moment(elem.endDate))) > 0;})

注意：如果日期重叠，则函数返回true，否则返回false。另外，您还需要安装片刻以进行日期比较。

Answer 6

为什么我们不使用 moment 和 moment-range，不是所有浏览器都支持吗？ ?

window['moment-range'].extendMoment(moment);

const events1 = [{
    "Date": "05/15/2021",
    "EndTime": "17:00",
    "StartTime": "16:00"
},
{
    "Date": "05/15/2021",
    "EndTime": "18:00",
    "StartTime": "17:00"
},
{
    "Date": "05/15/2021",
    "EndTime": "18:45",
    "StartTime": "17:45"
}
];

const events2 = [{
    "Date": "05/15/2021",
    "EndTime": "17:00",
    "StartTime": "16:00"
},
{
    "Date": "05/15/2021",
    "EndTime": "18:00",
    "StartTime": "17:00"
},
{
    "Date": "05/15/2021",
    "EndTime": "19:45",
    "StartTime": "18:45"
}
];

function checkOverlap(timeSegments) {

    var overlap = timeSegments
        .map(r =>
            timeSegments.filter(q => q != r).map(q =>
                moment.range(
                    moment(q.Date + " " + q.StartTime),
                    moment(q.Date + " " + q.EndTime)
                ).overlaps(
                    moment.range(
                        moment(r.Date + " " + r.StartTime),
                        moment(r.Date + " " + r.EndTime)
                    )
                )
            )
        );

    console.log(overlap.map(x => x.includes(true)).includes(true));
}

checkOverlap(events1);
checkOverlap(events2);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-range/4.0.2/moment-range.js"></script>

检查是否有两个以上的日期范围重叠

6 个答案: