Angularjs - html table with months and weeks - angularjs

Question

I want somthing like this, a table with months and weeks number:
I made this JS Ffiddle: https://jsfiddle.net/2fxq4pc9/
function TodoCtrl($scope) {
$scope.filter = {
"year": ''+new Date().getFullYear()
};
$scope.months = [
{"name": "Jan","number": 1, "totalWeeks": null, "weeks": null},
{"name": "Feb","number": 2, "totalWeeks": null, "weeks": null},
{"name": "Mar","number": 3, "totalWeeks": null, "weeks": null},
{"name": "Apr","number": 4, "totalWeeks": null, "weeks": null},
{"name": "May","number": 5, "totalWeeks": null, "weeks": null},
{"name": "Jun","number": 6, "totalWeeks": null, "weeks": null},
{"name": "Jul","number": 7, "totalWeeks": null, "weeks": null},
{"name": "Aug","number": 8, "totalWeeks": null, "weeks": null},
{"name": "Sep","number": 9, "totalWeeks": null, "weeks": null},
{"name": "Oct","number": 10, "totalWeeks": null, "weeks": null},
{"name": "Nov","number": 11, "totalWeeks": null, "weeks": null},
{"name": "Dec","number": 12, "totalWeeks": null, "weeks": null}
];
$scope.getTotalWeekOfAMonth = function(year, month) {
var firstOfMonth = new Date(year, month - 1, 1);
var day = firstOfMonth.getDay() || 6;
day = day === 1 ? 0 : day;
if (day) { day-- }
var diff = 7 - day;
var lastOfMonth = new Date(year, month, 0);
var lastDate = lastOfMonth.getDate();
if (lastOfMonth.getDay() === 1) {
diff--;
}
var result = Math.ceil((lastDate - diff) / 7);
return result + 1;
}
$scope.createWeeksNumberList = function() {
$scope.months.forEach(function(element) {
var weekTotals = $scope.getTotalWeekOfAMonth($scope.filter.year, element.number);
var obj = [];
for (let week = 1; week <= weekTotals; week++) {
obj.push({"weekNumber": week, "flag": null });
}
element.weeks = obj;
element.totalWeeks = weekTotals;
});
}
$scope.createWeeksNumberList();
}
Is there a way to improve it and to show numbers of weeks consecutive? 1 to 52 (splitted by months).
The current one seems a bit slow and ugly (I'm concerned about the javascript code and not the css style).
Thanks.