angular-mighty-datepicker.js

angular.module("TestApp", ["mightyDatepicker"]);
angular.module("TestApp").controller("TestCtrl", function($scope){
  _callthis = function(day) {
    console.log("call this: ", day);
  }

  _filter = function (day) {
    w = day.weekday();
    return w < 6 && w > 0;
  }

  $scope.date = null;
  $scope.options = {
    start: moment().add('month', -1),
    months: 1,
    filter: _filter,
    callback: _callback
  }

  $scope.multi = [];
  $scope.optionsM = {
    months: 3,
    mode: "multiple",
    after: moment().add('month', -3),
    before: moment().add('month', 3)
  }
});

I think line 3 you mean '_callback', not '_callthis' as you get an undefined on line 17