title: Angular-UI Datepicker min-date setting with another date
body: <p>When user inputs date range using <a href="http://angular-ui.github.io/bootstrap/#!#datepicker" rel="nofollow noreferrer">angular-ui Datepicker</a>, I wanna make mindate of <code>EndDate</code> set 'StartDate`.</p>
  
  <p>in my view,</p>
  
  <pre><code>&lt;div class="input-daterange input-group" id="datepicker"&gt;
    &lt;input type="text" class="input form-control" name="ev_StartDate"
     ng-model="evStartDate" ng-required="true" is-open="startPop.opened"
     ng-focus="openStart()" uib-datepicker-popup="{{format}}" 
     alt-input-formats="altInputFormats" datepicker-options="startDateOptions" 
     readonly="true"&gt;
    &lt;span class="input-group-addon"&gt;~&lt;/span&gt;
    &lt;input type="text" class="input form-control" name="ev_EndDate" 
     ng-model="evEndDate" ng-required="true" is-open="endPop.opened" 
     ng-focus="openEnd()" uib-datepicker-popup="{{format}}" 
     alt-input-formats="altInputFormats" datepicker-options="endDateOptions" 
     readonly="true"&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>which directive is right to use?</p>
  
  <pre><code>$scope.startDateOptions = {
    showWeeks: false,
    startingDay: 1
  };
  
  $scope.setOption = function() {
     ????????
    };
  
  $scope.endDateOptions = {
    showWeeks: false,
    startingDay: 1,
    minDate: ?????
  };
  </code></pre>