Question

我正在尝试做两件事。

根据当天计算特定月份的营业日数（即今天是2012年3月7日，因此已过去5个工作日）
根据当天计算给定月份的营业日数（即今天是2012年3月7日，因此本月还有17个工作日。

非常感谢任何帮助。

编辑：这是我到目前为止所尝试的：

function isWeekday(year, month, day) {var day = new Date(year, month, day).getDay();return day !=0 && day !=6;}
function getWeekdaysInMonth(month, year) {var days = daysInMonth(month, year);var weekdays = 0;for(var i=0; i< days; i++) {if (isWeekday(year, month, i+1)) weekdays++;}return weekdays;}
function calcBusinessDays(dDate1, dDate2) {
    var iWeeks, iDateDiff, iAdjust = 0;
    if (dDate2 < dDate1) return -1;                 // error code if dates transposed
    var iWeekday1 = dDate1.getDay();                // day of week
    var iWeekday2 = dDate2.getDay();
    iWeekday1 = (iWeekday1 == 0) ? 7 : iWeekday1;   // change Sunday from 0 to 7
    iWeekday2 = (iWeekday2 == 0) ? 7 : iWeekday2;
    if ((iWeekday1 > 5) && (iWeekday2 > 5)) iAdjust = 1;  // adjustment if both days on weekend
    iWeekday1 = (iWeekday1 > 5) ? 5 : iWeekday1;    // only count weekdays
    iWeekday2 = (iWeekday2 > 5) ? 5 : iWeekday2;
    // calculate differnece in weeks (1000mS * 60sec * 60min * 24hrs * 7 days = 604800000)
    iWeeks = Math.floor((dDate2.getTime() - dDate1.getTime()) / 604800000)
    if (iWeekday1 <= iWeekday2) {
    iDateDiff = (iWeeks * 5) + (iWeekday2 - iWeekday1)
    } else {
    iDateDiff = ((iWeeks + 1) * 5) - (iWeekday1 - iWeekday2)
    }
    iDateDiff -= iAdjust                            // take into account both days on weekend
    return (iDateDiff + 1);                         // add 1 because dates are inclusive
}

不太确定如何将它们放在一起以便让工作日过去和工作日。

Answer 1

这是一个非常简单的函数，只需循环几天，应该足够快，因为它永远不应该循环超过31次。如果当天是工作日，则会在过去几天计算：

function businessDays(date) {

  // Copy date
  var t = new Date(date);
  // Remember the month number
  var m = date.getMonth();
  var d = date.getDate();
  var daysPast = 0, daysToGo = 0;
  var day;

  // Count past days
  while  (t.getMonth() == m) {
    day = t.getDay();
    daysPast += (day == 0 || day == 6)? 0 : 1;
    t.setDate(--d);
  }

  // Reset and count days to come
  t = new Date(date);
  t.setDate(t.getDate() + 1);
  d = t.getDate();

  while  (t.getMonth() == m) {
    day = t.getDay();
    daysToGo += (day == 0 || day == 6)? 0 : 1;
    t.setDate(++d);
  }
  return [daysPast, daysToGo];
}

alert(businessDays(new Date(2012,2,7))); // 7-Mar-2012 => 5, 17

使用Javascript计算月中的营业日

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