How to concatenate date and time in angular 6

Question

<div class="row">

<div class="col-xs-6">

<div class="form-group">

<div class="wheel-date" style="width: 100% !important;">

<!-- <span>Pickup Date</span> -->

<label for="date_pick">

<input class="form-control date-pick" type="text" placeholder="Pickup Date" ng-model="pickupdate"

[(ngModel)]="Testing.pickupDateTime" [ngModelOptions]="{standalone: true}"

name="date_pick" id="date_pick">

</label>

</div>

</div>

</div>

<div class="col-xs-6">

<div class="form-group">

<!-- <span>Pickup Time</span> -->

<input class="time-pick form-control" type="text" placeholder="Time" name="time_pick" id="time_pick"

ng-model="pickuptime" [(ngModel)]="Testing.pickupDateTime" [ngModelOptions]="{standalone: true}">

</div>

</div>

</div>