Combining Date and Time input strings as a Date object

In angular it would go something like this:

Controller:

function exampleController($scope) {
    $scope.title = "$Watch sample";   

    $scope.$watch('sdate', function() {
       tryCombineDateTime(); 
    });

    $scope.$watch('stime', function() {
       tryCombineDateTime();
    });

    function tryCombineDateTime() {
        if($scope.sdate && $scope.stime) {
            var dateParts = $scope.sdate.split('-');
            var timeParts = $scope.stime.split(':');

            if(dateParts && timeParts) {
                dateParts[1] -= 1;
                $scope.fullDate = new Date(Date.UTC.apply(undefined,dateParts.concat(timeParts))).toISOString();
            }
        }
    }
}

HTML

<div ng-app ng-controller="exampleController">
    <h2>{{title}}</h2>
    <p>Start Date</p><p> <input ng-model="sdate" type="date" ></p>
    <p>Start Time</p><p> <input ng-model="stime" type="time" ></p>

    {{fullDate}}
</div>

You need to make use of the $watch listener on a variable when it changes, then call your function.

Note: it would be even better if you make a directive for this.

Fidle

A very naive approach to combine these two is to split date-components and time-components and make a string. Then make a new Date object using this string.

Input is taken from here:

<p>Start Date</p><p> <input ng-model="sdate" type="date" ></p>
<p>Start Time</p><p> <input ng-model="stime" type="time" ></p>

Then in script part, split date and time components as follows:

        var dd = new Date(sdate).getDate();
        var mm = new Date(sdate).getMonth()+1;
        var yy = new Date(sdate).getFullYear();
        var hh = new Date(stime).getHours();
        var ms = new Date(stime).getMinutes();

Then Combine these components to form a string as required(in Calendar):

var x = yy + ',' + mm + ',' + dd + ' ' + hh + ':' + ms;

Now create a new Date object:

var finaldate = new Date(x);