bar.js

fill("01/15/2016", "12/20/2016")

foo.js

var work = {
  addressLine1: "",
  city: "",
  country: "",
  state: "",
  postalCode: ""
}

var home = {
  addressLine1: "",
  city: "",
  country: "",
  state: "",
  postalCode: ""
}

var request = {
  business: true,
  tripMiles: "FILL THIS IN",
  vehicleId: 1111111 // find this by logging a mileage entry and inspecting the network tab for `mileagelog`
}


function fill(startDate, endDate) {
  var start = new Date(startDate);
  var end = new Date(endDate);

  while(start < end){
    if(start.getDay() > 0 && start.getDay() < 6) {
      logEntry(start)
    }
    var newDate = start.setDate(start.getDate() + 1);
    start = new Date(newDate);
  }
}

function logEntry(date) {
  var recordDate = date.toISOString().split('T')[0]
  var to = $.extend(true, {
    startAddress: home,
    endAddress: work,
    description: "Travel to client site",
    tripLocalDateTime: recordDate
  }, request);
  var from = $.extend(true, {
    startAddress: work,
    endAddress: home,
    description: "Travel from client site",
    tripLocalDateTime: recordDate
  }, request);
  logMileage(to);
  logMileage(from);
}

function logMileage(entry) {
  $.ajax({
      type: 'POST',
      url: '/secure/mileagelog',
      data: JSON.stringify(entry),
      dataType: 'json',
      success: function(data, status) {
        console.log(status);
        console.log(data);
      },
      headers: {
        'Content-Type': 'application/json',
      }
  })

}