如何获取两个日期之间的天数？

Question

我需要计算两个日期之间的天数。我已经检查了这个链接给出的代码 How to calculate the number of days between two dates using JavaScript?.

在此示例中，如果输入 2012,02,29 和 2012,03,01，则输出为 3。实际答案应为 1。这些还有其他方法可以计算 2 个日期之间的天数吗？

Answer 1

对我有用 - 请记住 JS 中的月份从 0 开始，所以这里是 2012 年 2 月 29 日到 3 月 1 日

var oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
var firstDate = new Date(2012, 1, 29, 12, 0, 0, 0); // 29th of Feb at noon your timezone
var secondDate = new Date(2012, 2, 1, 12, 0, 0, 0); // 1st of March at noon

var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime()) / (oneDay)));
console.log(firstDate, "to", secondDate, "\nDifference: " + diffDays + " day");

Answer 2

我也遇到了同样的问题，成功为此浪费了半天的时间。终于解决了问题。可以看下面的例子：

注意：不要忘记包含 jquery 脚本：

$("#ToDate").change(function() {
  var start = new Date($('#FromDate').val());
  var end = new Date($('#ToDate').val());
  var diff = new Date(end - start);
  var days = 1;
  days = diff / 1000 / 60 / 60 / 24;
  if (days == NaN) {
    $('#TotalDays').val(0);
  } else {
    $('#TotalDays').val(days + 1);
  }
})

<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>


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  <div class="card-body">
    <h4 class="card-title">Apply Leave</h4>
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        <input type="date" min="{{date('Y-m-d')}}" name="from" class="form-control" id="FromDate">
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      <div class="col-sm-4">
        <input type="date" name="to" class="form-control" id="ToDate">
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    </div>
    <div class="form-group row">
      <label for="fname" class="col-sm-3 text-right control-label col-form-label">Days</label>
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    <div class="form-group row">
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