javascript - 查找日期之间所有 6 个月的开始日期和结束日期 javascript

Question

我遇到了使用 javascript 在开始结束日期之间每 6 个月进行一次分割的情况。考虑以下示例，

开始日期:11/08/2018(月/日/年)结束日期:2020年1月20日

分手后需要

From        To          Note
11/08/2018  12/31/2018  here 11/08/2018 and 12/31/2018 comes between July to Dec which is second half of year
01/01/2019  06/30/2019  here 01/01/2019 and 06/30/2019 comes between Jan - June which is first half of year
07/01/2019  12/31/2019  here 07/01/2019 and 12/31/2019 comes between July to Dec which is second half of year
01/01/2020  01/20/2020  here 01/01/2020 and 01/20/2020 comes between Jan - Jun which is first half year 

请指教

Answer 1

希望这有帮助 http://plnkr.co/edit/hgEyiLyrX3Lfa7NJTeaL :

  var startDate = moment('11/08/2018');
  var endDate = moment('01/20/2020');


  function splitHalfYear(startDate, endDate) {
    var startMonth = startDate.month();
    var currentDate = moment(startDate);
    var returner = [];
    if (startMonth < 6) {
      currentDate = currentDate.startOf('year').add('month', 6);
    }
    else {
      currentDate = currentDate.startOf('year').add('year', 1);
    }

    returner.push({from: startDate, to: moment(currentDate).subtract('second', 1)});

    while(currentDate <= endDate) {
      var from = moment(currentDate);
      currentDate = currentDate.add('month', 6);

      if (currentDate.isAfter(endDate)) {
        returner.push({from: from, to: endDate});
      }
      else {
        returner.push({from: from, to: moment(currentDate).subtract('second', 1)});
      }
    }

    return returner;
  }


  var dates = splitHalfYear(startDate, endDate);
  dates.forEach(function(interval) {
    document.write(interval.from.format() +' - ');
    document.write(interval.to.format() + '<br>');
  })