Set a Default current Datetime in datetime-local using Angularjs

I am new to HTML. I am stuck in a very simple problem. I am using datetime-local input type in a web application.
I just want to define a default current value for the datetime. Any ideas

HTML Code
<input type=”datetime-local” value=”row.ActivityDate” ng-disabled=”row.chkDateTime == false” ej-datetimepicker ng-init=”row.ActivityDate=”” ng-model=”row.ActivityDate” class=”form-control date”
id=”ptDateTimePicker{{$index}}” ng-required=”true” ng-change=”ejDTonChange(row.ActivityDate, $index)”>

im try to insert some queris but i want shows in html