Директива-обертка для Tooltip-а из Twitter Bootstrap (source - http://habrahabr.ru/post/164493/)

tbTooltip.js

angular.module("ExperimentsModule", [])
    .directive("tbTooltip", function(){
        return function(scope, element, iAttrs) {
            iAttrs.$observe('title', function(value) {
                element.removeData('tooltip');
                element.tooltip();
            });
        }
    });
    

usage.html

<span class="label label-warning"
      tb-tooltip
      title="You should pay order before {{order.cancelDateTime | date:'dd.MM.yyyy HH:mm'}}"
>
    {{order.cancelDateTime | date:'dd.MM.yyyy HH:mm'}}
</span>