Moment.js - 如何获取给定月份的每周数据[每周的开始日期和结束日期]，不包括上个月和下个月的日期答案

【问题标题】：Moment.js - How to get weekly data [startDate & endDate of each week] for given month excluding previous and next month dateMoment.js - 如何获取给定月份的每周数据[每周的开始日期和结束日期]，不包括上个月和下个月的日期
【发布时间】：2020-08-21 16:13:43
【问题描述】：

对于 2020 年 8 月，我需要这样的数据：- 根据 https://www.epochconverter.com/weeks/2020

Week 31 - 2020-08-01 to 2020-08-02

Week 32 - 2020-08-03 to 2020-08-09

Week 33 - 2020-08-10 to 2020-08-16

Week 34 - 2020-08-17 to 2020-08-23

Week 35 - 2020-08-24 to 2020-08-30

Week 35 - 2020-08-31 to 2020-08-31

根据这个信息

当我们将年份和月份传递给函数时，这应该可以工作，因为它应该是通用的

需要的输出

weekNumbers = ["Week 31", "Week 32", "Week 33", "Week 34", "Week 35", "Week 36"]; // week number should not start from 1. it should be continuos from last year.

weekList = []; // this should contain start and end date for each week

提前谢谢你

【问题讨论】：

标签： javascript reactjs angular momentjs moment-timezone

【解决方案1】：

常用变量：

const monthIndex = 8; // give month index
const year = 2020; // give year here

获取月份周数的代码：-

const getWeekNumbers = (year, month) => {
  let firstWeek = moment(new Date(year, month, 1)).isoWeek();   
  let lastWeek = moment(new Date(year, month + 1, 0)).isoWeek();

  let out = [`Week ${firstWeek}`];
  if (firstWeek === 52 || firstWeek === 53) {
    firstWeek = 0;
  }

  for (let i = firstWeek + 1; i <= lastWeek; i++) {
    out.push(`Week ${i}`);
  }
  return out;
};

获取月份周列表数据的代码：-

function getMomentDate(start, end) {
    return {
    startDate: moment([2020, monthIndex - 1, start]),
    endDate: moment([2020, monthIndex - 1, end])
  }
}

function weeks (month) {
    const weekStartEndDay = [];
    const first = month.day() == 0 ? 6 : month.day()-1;
    let day = 7-first;
    const last = month.daysInMonth();
    const count = (last-day)/7;

    weekStartEndDay.push(getMomentDate(1, day));
    for (let i=0; i < count; i++) {
        weekStartEndDay.push(getMomentDate((day+1), (Math.min(day+=7, last))));
    }
    return weekStartEndDay;
}

调用并获取输出：-

const month = moment([year, monthIndex - 1])
const weekNumbers = getWeekNumbers(year, monthIndex - 1);
const weekList = weeks(month);
console.log("weekNumbers", weekNumbers);
console.log("weekList", weekList);
weekList.forEach(date => {
    console.log("start - " + date.startDate.format('YYYY-MM-DD'), "\nend - " + date.endDate.format('YYYY-MM-DD'));
});

2020 年 8 月的控制台输出

REPL 链接：- https://repl.it/@SaHiLShiKalgar/WeekNumber-and-WeekList

【讨论】：