Subtract two dates - Angular - [15 days - 1 Month - 2 Months]

angular_date_subtraction.js

// Set time-period combo option
$scope.timePeriodOptions = [
        { option: "Last 15 days", model: "15Days" },
        { option: "Last 1 month", model: "1Month" },
        { option: "Last 2 months", model: "2Month" }
    ];
$scope.timePeriod= { startDate: "", endDate: "" };

if(timePeriod.model == "15Days" ){
    $scope.startDate = new Date(new Date().setDate(new Date().getDate() -15 ));
    $scope.endDate = new Date();

    // Add preceding "0" to Date and Month is value < 10 -> To make a valid request to the server. (yyy-MM-DD)
    $scope.timePeriod.startDate = $scope.startDate.getFullYear() +"-"+
                                            (($scope.startDate.getMonth()+1) < 10 ? "0".concat( ($scope.startDate.getMonth()+1).toString() ) : ($scope.startDate.getMonth()+1)) +"-"+ 
                                             ($scope.startDate.getDate() < 10 ? "0".concat(($scope.startDate.getDate()).toString()) : $scope.startDate.getDate());
    $scope.timePeriod.endDate = $scope.endDate.getFullYear() +"-"+
                                          (($scope.endDate.getMonth()+1) < 10 ? "0".concat( ($scope.endDate.getMonth()+1).toString() ) : ($scope.endDate.getMonth()+1)) +"-"+ 
                                           ($scope.endDate.getDate() < 10 ? "0".concat(($scope.endDate.getDate()).toString()) : $scope.endDate.getDate());
  }
  else if(timePeriod.model == "1Month" ){
    $scope.startDate = new Date(new Date().setMonth(new Date().getMonth() - 1 ));
    $scope.endDate = new Date();

   // Add preceding "0" to Date and Month is value < 10 -> To make a valid request to the server. (yyy-MM-DD)
    $scope.timePeriod.startDate = $scope.startDate.getFullYear() +"-"+
                                            (($scope.startDate.getMonth()+1) < 10 ? "0".concat( ($scope.startDate.getMonth()+1).toString() ) : ($scope.startDate.getMonth()+1)) +"-"+ 
                                             ($scope.startDate.getDate() < 10 ? "0".concat(($scope.startDate.getDate()).toString()) : $scope.startDate.getDate());
    $scope.timePeriod.endDate = $scope.endDate.getFullYear() +"-"+
                                          (($scope.endDate.getMonth()+1) < 10 ? "0".concat( ($scope.endDate.getMonth()+1).toString() ) : ($scope.endDate.getMonth()+1)) +"-"+ 
                                           ($scope.endDate.getDate() < 10 ? "0".concat(($scope.endDate.getDate()).toString()) : $scope.endDate.getDate());
  }
  else if(timePeriod.model == "2Month" ){
    $scope.startDate = new Date(new Date().setMonth(new Date().getMonth() - 2 ));
    $scope.endDate = new Date();

    // Add preceding "0" to Date and Month is value < 10 -> To make a valid request to the server. (yyy-MM-DD)
    $scope.timePeriod.startDate = $scope.startDate.getFullYear() +"-"+
                                            (($scope.startDate.getMonth()+1) < 10 ? "0".concat( ($scope.startDate.getMonth()+1).toString() ) : ($scope.startDate.getMonth()+1)) +"-"+ 
                                             ($scope.startDate.getDate() < 10 ? "0".concat(($scope.startDate.getDate()).toString()) : $scope.startDate.getDate());
    $scope.timePeriod.endDate = $scope.endDate.getFullYear() +"-"+
                                          (($scope.endDate.getMonth()+1) < 10 ? "0".concat( ($scope.endDate.getMonth()+1).toString() ) : ($scope.endDate.getMonth()+1)) +"-"+ 
                                           ($scope.endDate.getDate() < 10 ? "0".concat(($scope.endDate.getDate()).toString()) : $scope.endDate.getDate());
  }