如何使用Moment JS计算范围之间给定工作日的数量？

Question

如何使用Moment JS和jQuery找出某个工作日(例如:星期二)中有多少个在日期范围内？

我可以找到使用差异的天数:http: //momentjs.com/docs/#/displaying/difference/

我知道开始和结束日期,所以我觉得应该可以吗？

示例:3月1日到3月25日之间有多少个星期二？

Answer 1

我想出了以下函数,它似乎适用于我尝试的一些测试用例:

function weekdaysBetween(d1, d2, isoWeekday) {
    // ensure we have valid moment instances
    d1 = moment(d1);
    d2 = moment(d2);
    // figure out how many days to advance to get to the next
    // specified weekday (might be 0 if d1 is already the 
    // specified weekday).
    var daysToAdd = ((7 + isoWeekday) - d1.isoWeekday()) % 7;
    var nextTuesday = d1.clone().add(daysToAdd, 'days');
    // if we are already passed the end date, there must not
    // be any of that day in the given period.
    if (nextTuesday.isAfter(d2)) {
        return 0;
    }
    // otherwise, just return the whole number of weeks
    // difference plus one for the day we already advanced to
    var weeksBetween = d2.diff(nextTuesday, 'weeks');
    return weeksBetween + 1;
}

您传递了isoWeekday您想要计算的那天的值.例如,周二,传入2.

示例调用:

var d1 = moment('2015-03-01');
var d2 = moment('2015-03-25');

console.log('result:', weekdaysBetween(d1, d2, 2)); // => result: 4

Wolfram Alpha给出了相同的结果.

但是,在完全信任之前,您应该添加自己的测试.