ok guys for any one wanting a prevalueeditor for dates here is the example for the same needs that i had

View and controller:

<div ng-controller="My.Date as vm">
    <umb-date-time-picker ng-model="vm.date" 
                          options="vm.config"
                          on-change="vm.datePickerChange(selectedDates, dateStr, instance)">
    </umb-date-time-picker>
</div>



(function () {
    "use strict";

    function datePicker($scope) {

        var vm = this;
        vm.date = $scope.model.value;
        var value;

        vm.config = {
            enableTime: false,
            dateFormat: "d-m-y",
            time_24hr: false
        };

        vm.datePickerChange = datePickerChange;

        function datePickerChange(selectedDates, dateStr, instance) {
            value = dateStr;
        }

        $scope.$on("formSubmitting", function () {
            $scope.model.value = value;
        });
    }
    angular.module("umbraco").controller("My.Date", datePicker);
})();

dont forget to put your js controller in the package.manifest file :) ...thats it

thank you

Angelo