luxon - 使用luxon库显示相对于给定时间

Question

luxon是否支持显示相对于给定时间的功能？

时刻具有“日历时间”功能:

https://momentjs.com/docs/#/displaying/calendar-time/

moment().calendar(null, {
   sameDay: '[Today]',
   nextDay: '[Tomorrow]',
   nextWeek: 'dddd',
   lastDay: '[Yesterday]',
   lastWeek: '[Last] dddd',
   sameElse: 'DD/MM/YYYY'
});

我可以使用luxon达到同样的效果吗？

Answer 1

从 1.9.0 版本开始，您可以使用 toRelativeCalendar :

Returns a string representation this date relative to today, such as "yesterday" or "next month" platform supports Intl.RelativeDateFormat.

const DateTime = luxon.DateTime;

const now = DateTime.local();
// Some test values
[ now,
  now.plus({days: 1}),
  now.plus({days: 4}),
  now.minus({days: 1}),
  now.minus({days: 4}),
  now.minus({days: 20}),
].forEach((k) => {
  console.log( k.toRelativeCalendar() );
});

<script src="https://cdn.jsdelivr.net/npm/luxon@1.10.0/build/global/luxon.js"></script>

在 1.9.0版本之前，Luxon中没有 calendar() 等效项。

DateTime方法等效项=>输出=> For Moment users部分中声明的 Humanization手册页:

Luxon doesn't support these, and won't until the Relative Time Format proposal lands in browsers.

Operation       | Moment     | Luxon
---------------------------------------------------------------------------------------
"Calendar time" | calendar() | None (before 1.9.0) / toRelativeCalendar() (after 1.9.0)

如果需要，您可以自己编写一些东西，这里是一个自定义函数示例，该示例具有moment的 calendar()的类似输出:

const DateTime = luxon.DateTime;

function getCalendarFormat(myDateTime, now) {
  var diff = myDateTime.diff(now.startOf("day"), 'days').as('days');
  return diff < -6 ? 'sameElse' :
    diff < -1 ? 'lastWeek' :
    diff < 0 ? 'lastDay' :
    diff < 1 ? 'sameDay' :
    diff < 2 ? 'nextDay' :
    diff < 7 ? 'nextWeek' : 'sameElse';
}

function myCalendar(dt1, dt2, obj){
  const format = getCalendarFormat(dt1, dt2) || 'sameElse';
  return dt1.toFormat(obj[format]);
}

const now = DateTime.local();
const fmtObj = {
   sameDay: "'Today'",
   nextDay: "'Tomorrow'",
   nextWeek: 'EEEE',
   lastDay: "'Yesterday'",
   lastWeek: "'Last' EEEE",
   sameElse: 'dd/MM/yyyy'
};

// Some test values
[ now,
  now.plus({days: 1}),
  now.plus({days: 4}),
  now.minus({days: 1}),
  now.minus({days: 4}),
  now.minus({days: 20}),
].forEach((k) => {
  console.log( myCalendar(now, k, fmtObj) );
});

<script src="https://cdn.jsdelivr.net/npm/luxon@1.8.2/build/global/luxon.js"></script>

这段代码大致受 code启发，因此可以肯定地加以改进。