Combining Date and Time input strings as a Date object

Question

I have two input tags for picking date and time from user.

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

These two values are passed to a function where I want to combine these two input values as a Date object:

 new Date(y, m, d, hh, mm, a)

Which I can then use to plot an event's details in a Calendar. How can I combine these two values? I have tried:

start:new Date(sdate + stime)


start:new Date(sdate , stime)


start: new Date(sdate.getFullYear() + sdate.getMonth() + sdate.getDate() + stime.getHours + stime.getMinutes())

But none of what I have tried is working.

How do I achieve this when using AngularJS?

Answer 1

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

Answer 2

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);

Answer 3

You could do something like this, though this doesn't have anything to do with AngularJS and I can't test on older browsers. I am assuming that you are entering date/time as UTC and I am using Date to create an ISO8601 timestamp as an output. Also assumes that you are using a modern browser that supports HTML5 and ECMA5, otherwise you will need to modify the code.

HTML

<p>Start Date</p><p> <input id="myDate" ng-model="sdate" type="date" ></p>
<p>Start Time</p><p> <input id="myTime" ng-model="stime" type="time" ></p>
<div id="myIso"></div>

Javasceipt

var myIso = document.getElementById('myIso'),
    dateParts,
    timeParts;

function joinPartsAsDate() {
    if (dateParts && dateParts.length === 3 && timeParts && timeParts.length === 2) {
        // dateParts[1] -= 1; could be done here
        myIso.textContent = new Date(Date.UTC.apply(undefined, dateParts.concat(timeParts))).toISOString();
    } else {
        myIso.textContent = '';
    }
}

document.getElementById('myDate').addEventListener('change', function (e) {
    dateParts = e.target.value.split('-');
    if (dateParts[1]) { // this could be done in joinPartsAsDate, here for clarity
        dateParts[1] -= 1;
    }

    joinPartsAsDate();
}, false);

document.getElementById('myTime').addEventListener('change', function (e) {
    timeParts = e.target.value.split(':');
    joinPartsAsDate();
}, false);

On jsFiddle