Angular.js directive

I am trying to pass in a variable from a controller to a directives attribute value. I am using this directive http://ift.tt/1mQWipj. And my code looks like this

  <div ng-controller="transactionsController">
              <table class="table" data-row-style="rowStyle">
                <thead>
                <tr>
                  <th>Link to Transaction</th>
                  <th>Amount Invested</th>
                  <th>Payout Amount</th>
                  <th>Transaction Status</th>
                  <th>Time</th>
                </tr>
                </thead>
                <tbody>
                <tr ng-repeat="transaction in transactions">
                  <td><a href='http://ift.tt/1DLxfeI}}'> {{transaction.input_transaction_hash}} </a></td>
                  <td> {{transaction.value/100000000}} </td>
                  <td> {{(transaction.value/100000000) * 1.2}} </td>  <!--TODO: Investment % shouldn't be hardcoded -->
                  <td class='red' ng-if="transaction.confirmations < 6 || transaction.confirmations == null">unconfirmed</td>
                  <td class='green' ng-if="transaction.confirmations >= 6">confirmed</td>
                  <!-- <td>{{transaction.date}}</td> -->
                  <td><timer end-time="{{transaction.date}}">{{days}} days, {{hours}} hours, {{minutes}} minutes, {{seconds}} seconds.</timer><td>
                </tr>
              </tbody>
              </table>
            </div>
        </div>

The transaction.date is from a different controller than the directive and is a String formatted date in milliseconds. You can also look here for examples of the directive. http://ift.tt/1jw86ZJ