All proposed solutions didn't work for me but the closest one was from @Rishii.
I'm using AngularJS 1.4.4 and UI Bootstrap 0.13.3.
.directive('jsr310Compatible', ['dateFilter', 'dateParser', function(dateFilter, dateParser) {
return {
restrict: 'EAC',
require: 'ngModel',
priority: 1,
link: function(scope, element, attrs, ngModel) {
var dateFormat = 'yyyy-MM-dd';
ngModel.$parsers.push(function(viewValue) {
return dateFilter(viewValue, dateFormat);
});
ngModel.$validators.date = function (modelValue, viewValue) {
var value = modelValue || viewValue;
if (!attrs.ngRequired && !value) {
return true;
}
if (angular.isNumber(value)) {
value = new Date(value);
}
if (!value) {
return true;
}
else if (angular.isDate(value) && !isNaN(value)) {
return true;
}
else if (angular.isString(value)) {
var date = dateParser.parse(value, dateFormat);
return !isNaN(date);
}
else {
return false;
}
};
}
};
}])