momentjs-business.js

/**
 * momentjs-business.js
 * businessDiff (mStartDate)
 * businessAdd (numberOfDays)
 */
(function () {
  var moment;
  moment = (typeof require !== "undefined" && require !== null) &&
           !require.amd ? require("moment") : this.moment;

  moment.fn.businessDiff = function (param) {
    param = moment(param);
    var signal = param.unix() < this.unix()?1:-1;
    var start = moment.min(param, this).clone();
    var end = moment.max(param, this).clone();
    var start_offset = start.day() - 7;
    var end_offset = end.day();

    var end_sunday = end.clone().subtract('d', end_offset);
    var start_sunday = start.clone().subtract('d', start_offset);
    var weeks = end_sunday.diff(start_sunday, 'days') / 7;

    start_offset = Math.abs(start_offset);
    if(start_offset == 7)
      start_offset = 5;
    else if(start_offset == 1)
      start_offset = 0;
    else
      start_offset -= 2;


    if(end_offset == 6)
      end_offset--;

    return signal * (weeks * 5 + start_offset + end_offset);
  };

  moment.fn.businessAdd = function (days) {
    var signal = days<0?-1:1;
    days = Math.abs(days);
    var d = this.clone().add(Math.floor(days / 5) * 7 * signal, 'd');
    var remaining = days % 5;
    while(remaining){
      d.add(signal, 'd');
      if(d.day() !== 0 && d.day() !== 6)
        remaining--;
    }
    return d;
  };

  moment.fn.businessSubtract = function(days){
    return this.businessAdd(-days);
  };

}).call(this);