如何计算两个选定日历日期之间的总天数。

Question

假设我有开始日期=2015年7月16日和结束日期=2015年7月20日。这两个日期存储在SharePoint列表中。

如果用户选择与SharePoint列表中的日期相同的确切日期，则可以计算总天数=2，这意味着不计算其他日期。

请问是否有人能帮忙解决这个问题？

我使用以下代码计算不包括周末在内的日期差异的总天数。但我找不出如何计算选定日期的总天数而不计算其他日期的方法。

function workingDaysBetweenDates(startDate,endDate) {

// Validate input
if (endDate < startDate)
    return 'Invalid !';

// Calculate days between dates
var millisecondsPerDay = 86400 * 1000; // Day in milliseconds
startDate.setHours(0,0,0,1);  // Start just after midnight
endDate.setHours(23,59,59,999);  // End just before midnight
var diff = endDate - startDate;  // Milliseconds between datetime objects    
var days = Math.ceil(diff / millisecondsPerDay);

// Subtract two weekend days for every week in between
var weeks = Math.floor(days / 7);
var days = days - (weeks * 2);

// Handle special cases
var startDay = startDate.getDay();
var endDay = endDate.getDay();

// Remove weekend not previously removed.   
if (startDay - endDay > 1)         
    days = days - 2;


// Remove start day if span starts on Sunday but ends before Saturday
if (startDay == 0 && endDay != 6)
    days = days - 1; 

// Remove end day if span ends on Saturday but starts after Sunday
if (endDay == 6 && startDay != 0)
    days = days - 1;

return days;

}

- Bryan

Answer 1

以下函数计算两个日期之间的工作日数

function getBusinessDatesCount(startDate, endDate) {
    var count = 0;
    var curDate = startDate;
    while (curDate <= endDate) {
        var dayOfWeek = curDate.getDay();
        if(!((dayOfWeek == 6) || (dayOfWeek == 0)))
           count++;
        curDate.setDate(curDate.getDate() + 1);
    }
    return count;
}


//Usage

var startDate = new Date('7/16/2015');
var endDate = new Date('7/20/2015');
var numOfDates = getBusinessDatesCount(startDate,endDate);
$('div#result').text(numOfDates);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="result"/>

- Vadim Gremyachev

---

根据 https://www.w3schools.com/jsref/jsref_obj_date.asp，getDate() 返回月份中的日期。这是您想要的吗？ - user1522973

当夏令时变为冬令时时，此代码会失效。例如：开始日期为 10/27/17 ，结束日期为 10/30/17 。代码只会计算一天而不是两天。 - Markus

Answer 2

首先你需要计算时间差，然后将时间转换为天数。

var calculateDifference = function(date1, date2){
    var timeDifference = Math.abs(date2.getTime() - date1.getTime());
    return Math.ceil(timeDifference / (1000 * 3600 * 24));//ms * seconds * hours
}

var difference = calculateDifference(new Date("7/16/2015"), new Date("7/20/2015"));

未经测试，但应该可以工作...

- Kevin Kuyl

Answer 3

使用 moment 的 startDate 和 endDate：

function getBusinessDaysCount(startDate, endDate) {
  let relativeDaySequence = [...Array(endDate.diff(startDate, "days")).keys()];
  let daySequence = relativeDaySequence.map(relativeDay => {
    let startDateClone = startDate.clone();
    return startDateClone.add(relativeDay, "days");
  });
  return daySequence.reduce(
    (dayCount, currentDay) => dayCount + (currentDay.day() === 0 || currentDay.day() === 6 ? 0 : 1),
    0
  );
}

- Prophet Daniel

Answer 4

可以试试这个，它也会起作用。

//fromDate is start date and toDate is end Date
    var timeDiff = Math.abs(toDate.getTime() - fromDate.getTime());
    var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)) ;
//  var startDay = fromDate.getDay();
    debugger;
    var diffDayWeek = diffDays + fromDate.getDay();
    var diffDiv = Math.floor(parseInt(diffDayWeek/7));
    diffDiv *= 2; "Saturday and Sunday are Weekend
    diffDays += 1 - diffDiv;

- Oubaid Ahmed