Bootstrap Date/Time: Override default minute selection

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout/2.2.1/knockout-min.js"></script>
<script src="https://raw.githubusercontent.com/tarruda/bootstrap-datetimepicker/master/src/js/bootstrap-datetimepicker.js"></script>
<script src="http://tarruda.github.com/bootstrap-datetimepicker/assets/js/bootstrap-datetimepicker.pt-BR.js"></script>
Selected: <label data-bind='text: totime'></label>
<br/>
<input data-format="hh:mm" data-bind="datepicker1:totime, value:totime">
</input>

JavaScript

ko.bindingHandlers.datepicker1 = {
    init: function (element, valueAccessor, allBindingsAccessor) {
         
        $(function () {
            $(element).parent().datetimepicker({
                pickDate: false,
                pickSeconds: false

            });

            var picker = $(element).parent().datetimepicker().data('datetimepicker');

            var obj = $(element).parent().datetimepicker()

        });

        //initialize datepicker with some optional options 
        var options = allBindingsAccessor().datepickerOptions || {};
        $(element).parent().on('changeDate', function () {
             
            $(element).change();
        });
 
        //when a user changes the date, update the view model 
        ko.utils.registerEventHandler(element, "change", function (event) {
 
            var value = valueAccessor();
                     
            var input = $(event.target);
            var val = input.val(); 
            event.stopPropagation();
            event.preventDefault();
            var currentTime = new Date();
            var hours = currentTime.getHours();
            currentTime.setMinutes(currentTime.getMinutes() + 30);
            var minutes = currentTime.getMinutes();
            if (minutes < 10) minutes = "0" + minutes;
            var totime = hours + ":" + minutes; 

        });
    },
    update: function (element, valueAccessor) {
        var widget = $(element);
         
        var obs = valueAccessor();

        var picker = $(element).parent()
                               .datetimepicker()
                               .data('datetimepicker')
        
        obs(picker.getDate())
    }
};

vm = {
    totime: ko.observable('')
    
};

vm.totime.subscribe(function(nv){
    console.log("New time: " + nv)
});

ko.applyBindings(vm)

var padLeft = function padLeft(s) {
    if (2 < s.length){ return s;}
    return Array(2 - s.length + 1).join('0') + s;
};

(function () {

    var table =...