如何使用时刻获取最近3周的日期范围？

Question

I need date range of last 3 weeks including current week date range.

Ex: today's date is : 31/08/2018

output will be :

Aug 26 - Sep 01 , Aug 19 - Aug 25 , Aug 12 - Aug 18

Answer 1

You can find the start of the week using .startOf('week') .

 var currentWeek = getWeekRange(0); var lastWeek = getWeekRange(-1); var weekBeforeLast = getWeekRange(-2); var currentWeek2 = getWeekRange2(0); console.log(currentWeek, lastWeek, weekBeforeLast, currentWeek2); function getWeekRange(week = 0) { var weekStart = moment().add(week, 'weeks').startOf('week'); return [...Array(7)].map((_, i) => weekStart.clone().add(i, 'day').format('DD/MM/YYYY') ); } function getWeekRange2(week = 0) { var weekStart = moment().add(week, 'weeks').startOf('week'); var days = []; for (var i = 0; i < 7; i++) { days.push(weekStart.clone().add(i, 'day').format('DD/MM/YYYY')); } return days; } 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.js"></script> 

---

For clarification:

[...Array(7)] was used for brevity. It's creating an Array with 7 undefined items, ie [undefined, undefined, ...] . These items are treated as placeholder and will be mapped out into the days of the week using .map() .

Despite being undefined , I use the item's index within the array to increment the day of the week -- in other words, the first item of the array, [undefined] , would have an index of 0 , so we would add 0 days, and add until the end of the week.

You could also do something like:

function getWeekRange(week = 0) {
  var weekStart = moment().add(week, 'weeks').startOf('week');
  var days = [];
  for (var i = 0; i < 7; i++) {
    days.push(weekStart.clone().add(i, 'day').format('DD/MM/YYYY'));
  }
  return days;
}

Answer 2

Try this

moment().range(moment().subtract(3, 'weeks'), moment());

moment().subtract(3, 'weeks') this line will return the time before 3 weeks, moment() will return time now and range() will take the range from those two.

Hope it helps :)

Answer 3

 let startOfWeek = moment().subtract(1, 'weeks').startOf('week').toDate().toISOString();
 let endOfWeek = moment().subtract(1, 'weeks').endOf('week').toDate().toISOString();
 console.log(startOfWeek, endOfWeek)