找出距离确切日期时间还有多少天、几小时和几分钟

Question

我试图做这样的事情但失败了。我可以在一天内编写代码，但还剩多少小时和分钟。

示例图片：

Answer 1

如果您想将Duration 转换为天、分、小时和秒，您可以这样做：

var days = duration.inDays;
var hours = duration.inHours % 24;
var minutes = duration.inMinutes % 60;
var seconds = duration.inSeconds % 60;

（如果您从总秒数而不是从 Duration 对象开始，您可以轻松地首先构造一个 Duration 对象：Duration(seconds: totalSeconds)。）

请参阅https://stackoverflow.com/a/68685066/ 了解更复杂的版本，它将Duration 格式化为String 的1d2h3.45s 形式。

Answer 2

我为个人项目做了类似的东西，这就是 sn-p。这是一个辅助函数，你必须给它ms，即EndDateInMs - StartDateInMs。还有一个TimeFrame 类型，但你不需要它；只需计算周/天/小时/分钟的逻辑即可。

import '../enums/enums.dart';

Map<TimeFrame, int> msConverter(double ms) {
  int minutes;
  int hours;
  int days;
  int weeks;

  const msInWeek = 6.048e+8;
  weeks = (ms / msInWeek).floor();

  final msLeftForDays = ms - (msInWeek * weeks);
  const msInDay = 8.64e+7;
  days = (msLeftForDays / msInDay).floor();

  final msLeftForHours = msLeftForDays - (msInDay * days);
  const msInHour = 3.6e+6;
  hours = (msLeftForHours / msInHour).floor();

  final msLeftForMinutes = msLeftForHours - (msInHour * hours);
  const msInMinute = 60000;
  minutes = (msLeftForMinutes / msInMinute).round();

  return <TimeFrame, int>{
    TimeFrame.Weeks: weeks,
    TimeFrame.Days: days,
    TimeFrame.Hours: hours,
    TimeFrame.Minutes: minutes,
  };
}