AngularJS validation and field name with square brackets
You have to escape your name in quotes, since a.example is equivalent of a['example'] you can write:
<span class="help-block" ng-show="company_bundle_task['company_bundle_task[timeStart][date]'].$error.required">Required</span>
Mati, You should try and use a function rather than evaluating such a long expression... call a simple function which is attached to your scope and controller and evaluate this expression correctly in it....
I usually, do not try to write the expression there but functions...
Regards