如何在MomentJS中获取上个月，过去三个月的天数列表 [英] How to get list of days for last month, last three months in MomentJS

问题描述

使用 moment().subtract(1, 'days').format("YYYY-MM-DD") 我可以获得从当前日期算起的最后 x 天.那么我如何获得上个月或过去三个月的所有天数..?

Using moment().subtract(1, 'days').format("YYYY-MM-DD") i can get last x days from the current date. So how can i get all days from last month or last three months..?

推荐答案

如果我正确理解你的问题，这可以通过两个步骤来实现.首先计算标记上个月开始日期的时刻:

If I understand your question correctly, this can be achieved via two steps. First calculate the moment that marks the starting date of the prior month:

var prevMonth = moment().subtract(1, 'month').startOf('month');
var prevMonthDays = prevMonth.daysInMonth();

然后，迭代范围0...prevMonthDays，计算该范围内每一天的日期，相对于上个月的开始prevMonth:

Then, iterate over the range 0...prevMonthDays, caclulating dates per day of that range, relative to the start of the previous month prevMonth:

  var prevMonthDay = prevMonth.clone().add(i, 'days').format("YYYY-MM-DD");

这样的事情应该可以满足您的要求:

Something like this should achieve what you require:

// Get moment at start date of previous month
var prevMonth = moment().subtract(1, 'month').startOf('month');
var prevMonthDays = prevMonth.daysInMonth();

// Array to collect dates of previous month
var prevMonthDates = [];

for (var i = 0; i < prevMonthDays; i++) {

  // Calculate moment based on start of previous month, plus day offset
  var prevMonthDay = prevMonth.clone().add(i, 'days').format("YYYY-MM-DD");
  
  prevMonthDates.push(prevMonthDay);
}

console.log(prevMonthDates)

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment.min.js"></script>

希望这会有所帮助！

要计算从过去多个月到当月月初的日期列表，上面的代码可以概括如下:

To calculate the list of dates starting many month past through to the beginning of the current month, the code above can be generalized as follows:

var monthsPast = 4;
var prevMonthDays = 0;
var prevMonth = moment();

// Iterate over number of months past that we want to collect dates for
for (var i = 0; i < monthsPast; i++) {

  // Calculate the moment at the start of a previous month
  var prevMonthStart = moment().subtract(i + 1, 'month').startOf('month');
  
  // Increment total range to collect dates over, and update prevMonth
  // to current calculated moment which represents oldest month start
  prevMonthDays += prevMonthStart.daysInMonth();
  prevMonth = prevMonthStart;
}

// Array to collect dates of previous month
var prevMonthDates = [];

for (var i = 0; i < prevMonthDays; i++) {

  // Calculate moment based on start of previous month, plus day offset
  var prevMonthDay = prevMonth.clone().add(i, 'days').format("YYYY-MM-DD");
  
  prevMonthDates.push(prevMonthDay);
}

console.log(prevMonthDates)

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.23.0/moment.min.js"></script>

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