javascript - 如何从 bootstrap-datepicker 获取 UTC 时间戳？

Question

如何让 bootstrap-datepicker 返回 UTC 时间戳而不是基于用户时区的时间戳？

我正在使用 bootstrap-datepicker 的 1.8.0 版本

以下示例显示选择日期时 bootstrap-datepicker 返回的时间戳:

HTML

<div class="container">
  <div class="row">
    <div class="col-sm-6">
      <div class="input-group date">
        <input type="text" class="form-control" id="js-date">
        <div class="input-group-addon">
          <span class="glyphicon glyphicon-th"></span>
        </div>
      </div>
    </div>
  </div>
  <div class="row">
    <span id="timestamp-output"></span>
  </div>
</div>

JavaScript

$(document).ready(function() {
  $('#js-date').datepicker();
});

$('#js-date').datepicker().on('changeDate', function (ev) {
  $('#timestamp-output').text(ev.date.getTime());
});

fiddle 示例

bootstrap-datepicker example

输出

当您运行示例并选择日期 11/29/2018 时，显示的时间戳为 1543478400000，对应于:

GMT: Thursday, November 29, 2018 8:00:00 AM

我需要的是它返回时间戳 1543449600000，它对应于:

GMT: Thursday, November 29, 2018 12:00:00 AM

摘要

bootstrap-datepicker 中有为此的配置选项吗？或者也许有一些可靠的方法将返回的本地化时间戳转换为 UTC 时间戳？

Answer 1

您可能想查看Moment.js 。 已更新我将本地时间戳转换为 UTC 时间戳。

$(document).ready(function() {
  $('#js-date').datepicker();
});

$('#js-date').datepicker().on('changeDate', function (ev) {
  
  var datetime = new Date(ev.date.getTime());
  // Convert local timestamp to UTC timestamp
  var local = moment(datetime).valueOf();
  var utc = (moment(datetime).add(-(moment().utcOffset()), 'm'));
  utc = moment.parseZone(utc).utc().valueOf();
  
  $('#timestamp-local').text('Local Timestamp is ' + local);
  $('#timestamp-utc').text('UTC Timestamp is ' + utc);
  
  console.log('UTC Offset is ' + moment().utcOffset());
});

<script src="https://rawgit.com/moment/moment/2.22.2/min/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/js/bootstrap-datepicker.js"></script>

<div class="container">
  <div class="row">
    <div class="col-sm-6">
      <div class="input-group date">
        <input type="text" class="form-control" id="js-date">
        <div class="input-group-addon">
          <span class="glyphicon glyphicon-th"></span>
        </div>
      </div>
    </div>
  </div>
  <div class="row">
    <span id="timestamp-local"></span><br/>
    <span id="timestamp-utc"></span>
  </div>
</div>